"cavity wall insulation"

Kingspan cavity wall insulation is helping to insulate a rural development of affordable homes.

Use of NyRock Cavity Slab 032 wall insulation in a full fill application.

Case study for cavity wall insulation upgrade at St James Wood apartments, Dublin.

ChallengeThe boundary between adjoining properties has always been assumed to be an area of neutral heat loss. However, research undertaken by Leeds Metropolitan University, MIMA (the Mineral Wool Insulation Manufacturers’ Trade Association), BRE (Building Research Establishment) and Knauf Insulation has revealed that a significant amount of heat is actually lost through uninsulated cavity party walls.It is estimated that there are 7.4million existing party walls that have been built with a cavity across the UK.Although these walls provide fire and acoustic separation to meet the requirements of relevant building regulations, the thermal performance of a party wall had not previously been considered.Knauf Insulation has provided solid evidence that its Supafil® Party Wall glass mineral wool blowing insulation is a reliable way of eliminating party wall bypass and so City West Housing Trust, a Salford based housing association, has installed the product as part of a pilot scheme to a number of its properties.Working alongside Bridgewater Surveyors and others, City West wanted to improve the energy efficiency of their tenants' properties and are continually looking for other ways to reduce energy costs and consumption. Knowing that by insulating the cavity party walls of properties could lower energy bills for their tenants they embarked on the trial project – with the aim of a possible roll out across other areas in the North West.After approaching Knauf Insulation for advice, City West and Bridgewater Surveyors settled on a reliable solution: Knauf Insulation’s Supafil® Party Wall insulation.SolutionSupafil® Party Wall prevents heat loss through party separating cavity walls by fully filling the cavity. Supafil® Party Wall is an in-situ formed unbonded, non-combustible glass mineral wool. Knauf Insulation have now completed an extensive research programme to develop a proven methodology for installation into existing homes to add to the product’s use in new build applications.As well as being an excellent thermal insulant, Supafil® Party Wall insulation also has good sound absorption characteristics which help to ensure that when a party wall is upgraded, it complies with the requirements of Approved Document Part E of the Building Regulations - which is designed to protect occupants from noise in adjoining rooms or buildings.As part of the Salford project, houses were tested before and after the installation took place. The reduction in the heat loss was equivalent to an improvement in the effective U-value of the party wall of at least 0.5 W/m2K. This shows there is a significant beneficial impact for tenants in fully filling cavity party walls with Supafil® Party Wall Insulation.Supafil® Party Wall insulation fitted into City West’s obligation to maintain a greener environment as the product conserves energy and reduces the emissions of the major greenhouse gas, CO2. The energy and CO2 emission saved by the product in use vastly outweighs those generated in its manufacture. Supafil® Party Wall has a generic BRE Green Guide Rating of A+ and has zero Ozone Depletion Potential and zero Global Warming Potential.When completed, the trials will measure the extent of customers’ energy bill savings – estimated to be up to £90 a year – as well as the amount of carbon emissions that could be reduced."We are committed to ensuring our properties are as energy efficient as possible and along with Supafil® Party Wall insulation we have installed cavity and loft insulation to our portfolio of properties."Gary Vaughan – Head of Sustainability & Supply Chain, City West

A systematic approach of arresting and reducing the flow of water within a cavity wall prior to any change in status of that wall helps balance demands on damp protection measures. In the case of a circular window passing through a curved cavity wall, protecting against damp ingress is easily achieved using a preformed Type K cavitray. The preformed Cavitray is curved to match the wall. Conventional flat material or roll material cannot uniformly match the radius of a wall.

CHALLENGEAn ambitious project, and one of the first certified PassivHaus homes in the UK - the Denby Dale PassivHaus in West Yorkshire, had to to use 90% less energy for space heating than the average UK dwelling – with a space heating need of only 15 kWh/m2/ year. The three-bedroom property is the first UK Passivhaus to be built in a traditional style using cavity wall construction and had to be built to a tight budget of £141,000.SOLUTION“We decided to go down the cavity wall path and arrived at the design for several reasons including: planning restrictions, thermal store, cost, and maybe most important of all, buildability,” explains Bill Butcher, Project Leader.Excellent performing insulation is obviously fundamental to Passivhaus construction and the Denby Dale house has 300mm Knauf Insulation DriTherm® Cavity Slab 32 in the walls, 500mm Knauf Insulation Loft Roll 44 in the roof void (both of which incorporate ECOSE® Technology) along with 225mm of high-performing Polyfoam® Floorboard Standard* insulation in the floor.“We’re fully filling the cavity with glass mineral wool insulation for the walls above ground, because it helps minimise air movement in the cavity and offers greater flexibility, fitting snugly around the ties, openings and imperfections of the masonry surface.” comments Bill Butcher.Economics, performance, availability, ease of fitting and reducing thermal bypass were all among the benefits of the Knauf Insulation products chosen.*No longer sold through Knauf Insulation.BENEFITSGlass Mineral Wool was specified over rigid insulation to ensure a tight thermal fit. Knauf Insulation DriTherm® Cavity Slabs are flexible enough to eliminate air gaps and prevent heat loss due to their inherent ability to knit together at joints between the slabs. If rigid insulation is used and fitted badly with too many gaps, air movement around and between the insulation boards is increased, which can drastically reduce its insulation value.Knauf Insulation DriTherm® Cavity Slabs are BBA Certified for all exposure zones and formally guaranteed for 50 years to prevent the transmission of liquid water from the outer masonry leaf to the inner masonry leaf.In addition to its thermal performance glass mineral wool also has other sustainable features. In manufacture it uses a high content of recycled glass bottles and requires less overall energy consumption than some alternative products, resulting in less carbon emissions. In addition, it can be recycled at the end of a building’s life and has zero GWP and zero ODP. ECOSE® Technology further extends these established green credentials as it is manufactured with 70% less energy than traditional binders and the products contain no dyes or added formaldehyde – providing the ideal solution to the eco-friendly house.

FIRETITE is a Class A2 fire-rated, clay mineral insulation ideal for new and refurbished cavity wall insulation. This innovative system combines the benefits of a hydrophobic and open-pore mineral insulation material with the fast, safe and seamless airtight process of a self-sealing system.The world's first 3-component clay mineral in-situ insulation material; it has been developed over many years of extensive research to create an exclusive formulation.

The Priscilla Bacon Lodge in Norfolk is a new £12.5 million hospice that will provide state-of-the-art palliative care for 24 patients alongside day care facilities, a wellness centre, gym and community hub for those being cared for at home. It will also be used for education and research into palliative and end-of-life care. The facility, designed by LSI Architects and delivered by Morgan Sindall Construction, features both traditional masonry cavity walls, and a masonry rainscreen façade.  Meeting the brief At just two stories high, the building doesn’t fall under building regulations that ban combustible materials in the wall build-up. But even so, combustibility was a key factor when it came to specifying the insulation. Jordan Armstrong, Associate at LSI Architects explained: “As a practice we always try to minimise fire risk, especially for a project like The Priscilla Bacon Lodge, which will house extremely vulnerable people. So, it was essential that the materials we used were non-combustible, which meant mineral wool insulation was the only solution. “We regularly use Knauf Insulation products, so we specified DriTherm® Cavity Slab 32 for the cavity walls because it’s a high-performing glass mineral wool insulation that we expected could meet our required 0.16 W/m2K U-value. We were also keen to specify their Rocksilk® RainScreen Slab for partially filled cavity walls because then we would have one manufacturer for the whole build, and we think the products will work well together.” DriTherm® Cavity Slab 32 is full-fill insulation solution with a thermal conductivity of 0.032W/mK. While Rocksilk® RainScreen Slab for partially filled cavity walls is a rock mineral wool product with a thermal conductivity of 0.034W/mK. Both products are BBA certified for the application. In addition to non-combustibility and thermal performance, both products also offer sound reduction characteristics. Ease of installation Both DriTherm® Cavity Slab 32 and Rocksilk® RainScreen Slab contain a water repellent additive that preserves the integrity of the slabs while they are exposed during construction.  The products are also designed to be easy to install correctly. They are sized to suit standard centres for installation between wall ties or brick restraint systems. Slabs are robust so they can be manoeuvred into place while maintaining the flexibility required to adapt to minor imperfections in the substrate to prevent gaps that reduce thermal, fire and acoustic performance.  Lastly, they are both manufactured using ECOSE® Technology, Knauf Insulation’s unique bio-based binder, which contains no added formaldehyde or phenol. It is made from natural raw materials that are rapidly renewable, and is 70% less energy-intensive to manufacture than traditional binders, so it is more environmentally friendly. The product is soft to touch, easy to handle, and generates low levels of dust and VOCs. So, when it came to specifying the insulation for the Priscilla Bacon Lodge, Knauf Insulation’s DriTherm® Cavity Slab 32 and Rocksilk® RainScreen Slab for partially filled cavity walls ticked all the boxes. 

Recticel Insulation’s innovative insulation board - Eurowall +, which has a tongue and groove joints on all four sides to ensure an airtight fit and improved thermal performance, was selected for a desirable new housing scheme built beside one of England’s eminent waterways.The Magenta Court development in Apsley, Hemel Hempstead is a multi-award nominated social housing project on behalf of Dacorum Borough Council. The £6.5m scheme, which stands alongside the famous Grand Union Canal, comprises 29 one-and-two bedroom flats within four blocks. The buildings’ design was inspired by the surrounding wharf architecture present in a nearby listed cottage, papermill and Apsley Lock.Being delivered by main contractor Jarvis Contracting, working with architects RG+P, key to the programme’s success was achieving an energy-efficient building fabric. This led to the specification of Eurowall®+, a high-performance PIR solution from Recticel.This flagship product helps to achieve a 0.18 U-value with a 90mm-thick panel in a 100mm cavity. The lightweight, easy-to-handle board features a tongue-and-groove joint on its four sides, allowing it to be used as full-fill cavity wall insulation with a 10mm clear cavity. The additional space makes for a rapid, more convenient fit for bricklayers when it comes to installation.Simon Blackham, Technical Manager at Recticel explained:This was a tremendous project to be involved with. It’s a superb housing scheme in a great location. With the buildings’ overall thermal efficiency among the priorities, it’s the type of project Eurowall®+ was created for. Further, it enhanced the programme’s sustainable credentials by reducing on-site labour times, thanks to the additional space it affords installers.Eurowall®+ is an exemplar of how high-performance materials can maximise a home’s thermal performance through a fabric-first approach. Its selection for the Magenta Court development was crucial to the creation of a number of desirable, energy-efficient affordable homes, whilst playing a part in ensuring the contractor remained on track to complete the project to the agreed timeframe. About Eurowall®+:Eurowall® + is a premium, high performance full fill insulation board with precision cut tongue and groove joints on all four sides. This ensures that the boards lock tightly together minimising heat loss through thermal bridging. This unique joint offers increased protection against wind driven rain as well as improved windtightness. Eurowall® + is also designed with a 10mm cavity requirement in mind, so that space can be left for conventional bricklaying techniques.

THE PROJECTRecticel’s Eurothane® GP and Eurowall® Cavity provided the quality PIR solution for two city-based social housing developments. Melody Gardens and Corporation Road in Salford, Manchester were built on behalf of Places for People and For Housing. Watson Homes carried out the work on both developments. For Melody Gardens, it involved the building of a four-storey block compromising 48 apartments; nine two-storey houses, and a bungalow. The properties were built on a 0.4-hectare site once occupied by a Catholic church.THE SOLUTIONEurothane® GP, a low-thermal conductivity panel, provided Melody Gardens’ groundfloor insulation. In conjunction with Eurowall® Cavity, it was also installed at Corporation Road which comprises 18 one-bed and 15 two-bed apartments. The products’ durable thermal performance ensured both developments become a valued addition to Salford’s social housing portfolio.Mike Watson, Construction Director at Watson Homes explained:"Recticel’s high-quality products were essential to ensuring the fabric of both developments was fitted with insulation that will fulfil the occupants’ long-term domestic needs. In terms of installation, the panels’ easy-fit properties made quicker and lighter work of a potentially challenging project."Used products:Eurothane GP: Eurothane® GP is a high performance PIR insulation board that is light weight, easy to cut, handle and install. Whether it’s a pitched roof, framed wall or floor, Eurothane® GP is the ideal solution amongst contractors and installersEurowall® Cavity:Eurowall® Cavity is a specialist high performance solution for cavity walls, with precision-cut straight edges to ensure gaps between boards are kept to a minimum. It has a low emissivity facing which delivers improved thermal resistance within the clear cavity.  

A range of premium and high performance products from Kingspan Insulation has been installed on a stunning new beachfront home on the Isle of Wight, featured on Grand Designs. This includes Kingspan Kooltherm K8 Cavity Board, which was used to insulate the majority of the walls throughout the property, and Kingspan Kooltherm K7 Pitched Roof Board, which was were applied to the ground floor overhang. With thermal conductivities as low as 0.020 W/m.K, the products delivered the required thermal performance with a slim build-up, helping to maximise space within the rooms.

Creating a Passivhaus home Balancing sustainability and style, Sort Trae is the culmination of a retired architect’s vision for a home and creative space that blends into a South Yorkshire hillside. HEM Architects helped the client to bring this dream to life, using Knauf Insulation’s glass mineral wool insulation to achieve the incredibly high Passivhaus standards for energy efficiency. Low carbon and high comfort The client envisioned a sustainable build using Passivhaus, a voluntary standard for designing and building properties with very low energy consumption, that offer high levels of comfort for their occupants. To achieve this, the levels of air tightness and thermal performance far exceed those mandated by building regulations. FrameTherm® Slab 32 was friction-fitted within the 140mm thick timber frame walls on the first floor, while DriTherm® Cavity Slab 32 was used to fill the stone-clad masonry cavity walls on the ground floor.  “We try to specify fully filled masonry cavity walls where possible, sometimes up to 200mm wide, to maximise the use of mineral wool insulation. It pays dividends for the client”, explained Liam Seaman, Architectural Technologist for HEM Architects. Thermal performance is critical to the Passivhaus approach. The FrameTherm® Slab 32 provided a calculated U-value of 0.137 W/m2K in combination with the black timber frame wall and cladding. For the masonry cavity wall on the ground floor, a fractionally higher U-value of 0.138 W/m2K was achieved using thermally broken wall ties and DriTherm® Cavity Slab 32. This has contributed to Sort Trae’s exceptional thermal efficiency. Because glass mineral wool is flexible and fibrous, slabs knit together and adapt to minor imperfections in the substrate. This tight fit contributed to an overall air change of 0.54 ach (air change per hour), comfortably below the Passivhaus standard of 0.6 ach, meaning the property is air-tight while still providing good ventilation. Sustainable practices Liam explained his reasons for choosing Knauf Insulation, “The alternative products are often oil-based and the application of these is outweighed by the environmental impact of their production and lifecycle.” Both FrameTherm® Slab 32 and DriTherm® Cavity Slab 32 are manufactured with ECOSE® Technology, Knauf Insulation’s unique bio-based binder that contains no added formaldehyde or phenol. The binder is made from natural raw materials that are rapidly renewable and is 70% less energy-intensive to manufacture than traditional binders. Knauf Insulation’s glass mineral wool insulation contains up to 80% recycled content, mostly glass bottles and jars. It is also compressed so more product can fit per pack or pallet, and less packaging is used. This means there’s more product per truck, resulting in fewer vehicles on the road, and less packaging per m2 of insulation. Achieving the Passivhaus standard In collaboration with HEM Architects and other suppliers, the client has created a stunning home and an inspiring set-up for her loom-weaving workshop. “It is general practice for us to specify Knauf Insulation as standard because we find the product information available to be really clear and useful”, Liam added. Knauf Insulation’s practical, detailed product information made it HEM Architects’ first choice to achieve the Passivhaus standard for thermal performance. 

Achieve better U-values whilst maintaining traditional cavity widths.Developer Mentmore Homes has built two five-bedroom houses in Gerrards Cross, Buckinghamshire, which are valued at £2.5million each. The walls required an insulation panel that achieved better U-values whilst maintaining traditional cavity widths. Eurowall +, manufactured by Recticel Insulation proved the ideal solution.Nicholas Peck from Mentmore Homes explained:"We wanted to make the properties as energy-efficient as possible. To make this happen, the best place to start is the insulation. Specifying Eurowall + meant we didn’t have to increase the size of the wall cavity and lose space inside the properties. The panel’s interlocking feature was another reason for its specification because it slots together so easily and will remain solid and airtight. We required a high quality product for this extremely high-profile project - Eurowall + didn’t disappoint."About Eurowall® +:Eurowall® + is a premium, high performance full fill insulation board with precision cut tongue and groove joints on all four sides. This ensures that the boards lock tightly together minimising heat loss through thermal bridging. This unique joint offers increased protection against wind driven rain as well as improved windtightness. Eurowall® + is also designed with a 10mm cavity requirement in mind, so that space can be left for conventional bricklaying techniques.

Built from traditional stone and slate, Preston Springs, a four bed home in Leyburn, North Yorkshire, may look like a typical new-build property, but it is far from it. Designed by architects LEAP, Preston Springs is a Passivhaus, meaning it is ahead of its time in terms of air quality, comfort and reduced energy use. It is one of the only properties of its type in the local area, with just over 1,000 Passivhaus properties in the whole of the UK. Passivhaus is a voluntary standard for designing and building very low energy properties that offer high levels of comfort for their occupants. To achieve this, the levels of air tightness and thermal performance far exceed those mandated by building regulations. To meet planning constraints, Preston Springs has been built using a conventional cavity wall construction. The 300mm cavity was fully-filled using two layers of 150mm Knauf Insulation DriTherm® Cavity Slab 34. Manufactured from Glass Mineral Wool, Knauf Insulation DriTherm® Cavity Slab is specifically designed for cavities and uses a water repellent additive to prevent water ingress, making it ideal for its exposed location close to the Yorkshire Dales.Knauf Insulation DriTherm® Cavity Slab 34 was chosen over rigid board insulation. Its structure meant the stone masons could cut and fit the insulation easily on site to ensure it fully-fills the cavity, touching both leaves continuously. This prevents undesirable air gaps that reduce thermal performance. It is worth noting that masonry construction with partially-filled cavities are particularly prone to air gaps between insulation boards or breaks in contact between the insulation and the wall surface.Secondly, because detailing at junctions between the building elements and the openings meant thermal bridging was virtually eliminated, a more cost effective insulation specification could be chosen. Principal architect Mark Siddall was confident that Knauf Insulation DriTherm® Cavity Slab 34 would deliver the 0.1 W/m2K U-Value required to help the project achieve Passivhaus certification. For the loft, Supafil® Loft Blowing Wool was specified after extensive consultation with Knauf Insulation’s Technical Support Team. While Supafil® Loft is very popular in Scandinavian countries, it is not widely used in the UK. However, Siddall believes that blown insulation has a distinct advantage over other insulation types when working towards very high levels of thermal performance. He said: “The advantage of Supafil® Loft insulation is that it can get it into all the nooks and crannies very quickly and easily. This makes it a low-cost solution as far as labour is concerned because installers don’t have to cut and scribe around individual trusses at 400 and 600mm centres – something that would take a huge amount of time. By avoiding these air gaps, the roof can be expected to deliver the thermal performance that was specified.”It was not just the use of Supafil® Loft that was unusual on the Preston Springs project, but its depth; 700mm of Supafil® Loft was installed, delivering a U-value of 0.06, which Siddall believes makes it one of the most highly-insulated lofts in the UK.Siddall explains that to achieve Passivhaus standard, installation is hugely important. He said: “The only way to close performance gaps is through high quality workmanship. I have used the same construction team on several projects. I ensured that the installer had received the necessary training on how to install the Supafil® Loft insulation correctly, so I had the quality assurance that it would perform as specified in practice.”Steve Wise, Programme and Product Development Manager at Knauf Insulation added: “It is always exciting to work on projects that feature products not commonly used in the UK or in applications that differ from the norm, such as the 700mm Supafil® Loft at Preston Springs.“Passivhaus projects allow us as manufacturers to explore what is possible. Preston Springs demonstrates how environmentally-focused design, high performance products and high quality installation can deliver and meet even the strictest thermal standards in a real-world environment.”Typically, Passivhaus properties achieve a 75% reduction in space heating requirements, compared to a standard UK new build. While monitoring is ongoing, anecdotal evidence from the owners show that Preston Springs is performing as designed, maintaining a temperate climate throughout the year. During ‘The Beast from the East’ the internal temperature was a reported 19°C without heating, while the external temperature plummeted to -6°C. Furthermore, the owners report they are delighted with the low energy bills thanks to the very high thermal performance of the insulation combined with the heat recovery system.

When Formby Point Construction needed to specify the insulation for The Gables, an exclusive housing development in Crosby, the project had multiple objectives. Firstly, the company wanted to go beyond the thermal and acoustic requirements outlined in the building regulations. Secondly, with such a large number of applications across multiple construction types, Formby Point Construction wanted to use one manufacturer and supplier to specify the correct product for each application. This would ensure ease of installation and ensure the project was delivered on budget.With this in mind, Formby Point Construction, consulted Formby-based builders’ merchant, Huws Gray, who referred it to Knauf Insulation.For the separating floor applications, Knauf Insulation recommended Knauf Insulation OmniFit® Roll 40, a versatile, non-combustible Euroclass A1 reaction to fire classification Glass Mineral Wool insulation that provides both excellent thermal and acoustic performance. Knauf Insulation also recommended Knauf Insulation DriTherm® Cavity Slab 32 for the masonry cavity external walls, Knauf Insulation Masonry Party Wall Slab for separating walls to comply with Document E and Knauf Insulation Loft Roll 40 for the insulation of the loft.As well as considering the comfort of the homeowner, Formby Point Construction considers the welfare of its employees as part of its decision making. In addition to excellent thermal and acoustic performance, Knauf Insulation scored highly on this aspect thanks to the ECOSE® Technology, its patented sustainable bio-based binder. Products manufactured with ECOSE® Technology contain no added phenol or formaldehyde, and they are 70% less energy-intensive than products manufactured with traditional formaldehyde-based binder. They have no odour, are softer to touch, making them much more pleasant to handle and install. They have also achieved the best possible Eurofins Gold Certificate for Indoor Air Comfort, contributing to a high level of indoor air quality for installers and homeowners alike.Once the specification had been agreed, Knauf Insulation then worked with Huws Gray to price the project and take advantage of volume discounts. This meant that Formby Point Construction had some additional budget for insulation. The company therefore decided to install Knauf Insulation Acoustic Roll within the stud walls between all rooms, going above the minimum standard required between bathrooms and bedrooms outlined in Document E.Thanks to Formby Point Construction’s commitment to going above and beyond the regulations, and Knauf Insulation’s high performance Glass Mineral Wool insulation, homeowners at The Gables will enjoy quieter, warmer homes. To see how Knauf Insulation can help with your insulation needs, check out our Housebuilders Hub.https://www.knaufinsulation.co.uk/Housebuilders-hub

Four years ago, sustainable developer Citu set out to create homes 10 times more energy efficient than typical UK houses. To do this, the company invested in a state-of-the-art production facility where all the components for its properties are built offsite.Thermal performance is critical to energy efficiency. Citu wanted to go far beyond the regulations to achieve wall build-ups with an extremely low U-value of just 0.10W/m2K. This is at least three times better than the U-value achieved in most new build homes and fifteen times better than older houses.Adding offsite capabilityCitu turned to Knauf Insulation for advice and support in developing the offsite capability required for this level of thermal performance. Knauf Insulation’s Technical Support Team undertook extensive calculations and recommended the Blowing Plate Insulation System to install Supafil® Frame – a high performance, non-combustible blowing wool.Supafil® Blowing Wool lends itself to offsite production because it completely fills the cavity, without any voids even around complex penetrations – something that can occur when insulation slabs or rolls are cut to size. It is also a dry process, so operatives are not exposed to any harmful chemicals and it doesn’t require a dedicated production line.Instead, the system comprises a blowing machine and a filling plate. The system is modular allowing for phased investment. Citu opted to install the blowing machine in phase one, which allowed them to manually fill the panels. Phase two saw the addition of the blowing plate, semi-automating the process.Supafil® Frame can be run by a single operator, fits easily into the existing production line, and can even be moved quickly and swiftly to other areas in the manufacturing facility depending on Citu’s volume capacity requirements.Knauf Insulation’s Technical Support Team provided full training and support during each phase of installation.Insulating the panelsCitu homes are manufactured from wooden panels with a 300mm cavity. The blowing plate is positioned over the panel completely covering the cavity. Supafil® is then blown into the wooden frame to the specific parameters of each panel. All cavities are filled to the correct thickness; something that has been carefully calculated and tested by the Knauf Insulation Technical Support Team to ensure settlement does not occur. And because the machine is programmed to install the exact quantity of insulation required, there’s no waste.Supafil® is a high performance Blowing Wool. It is non-combustible with Euroclass A1 reaction to fire classification as well as providing excellent thermal and acoustic performance. It contains a silicone-based additive to ensure it is water repellent.As well as providing excellent thermal performance, Supafil® has great sustainability credentials. Knauf Insulation’s Glass Mineral Wool contains up to 80% of recycled content. This reduces the amount of virgin materials used and prevents around 60,000 tonnes of glass a year (350 million bottles) from going to landfill or polluting the environment. Knauf Insulation has also invested in advanced compression packaging. This means there’s less packaging used, so fewer lorries on the roads leading to a reduction in transport carbon emissions. All of which helps to support Citu’s goal that every home should be carbon zero to manufacture.By combining modern methods of construction with the very highest levels of thermal performance, Citu and Knauf Insulation are creating homes that reduce energy consumption and carbon emissions – homes that are fit for the future.

Eurowall®+, Recticel’s innovative full-fill cavity wall PIR board, has been chosen for a new affordable housing development. With its advanced tongue and groove joint, it helped to achieve the project’s desired U-value whilst ensuring a ‘built as designed’ envelope.In total, 2000m2 of Eurowall®+ board was installed as part of a £3.3m new-build project in Bedmond Road, Abbots Langley – a large, picturesque village in Hertfordshire. On completion, the 17-home development on behalf of housing association, Thrive Homes, will introduce ‘good quality’ properties to the area. In order that the buildings achieved the regulatory U-value, the insulation needed to ensure a high-quality build whilst being simple to install. Eurowall®+ met both requirements comfortably.  Jarvis Contracting, in conjunction with architects, Avebury, was selected to deliver the scheme. It included the installation of 90mm-thick Eurowall®+ insulation, which earns its billing as Recitcel’s ‘flagship’ product due to its innovative composition and exceptional thermal performance. The boards have a tongue and groove joint on all four edges to ensure they lock tightly together. This inventive format helps to eliminate moisture ingress and possible heat loss through poor joints, whilst offering bricklayers a faster way to build. Once fitted together the boards created a thermally tight envelope, ensuring the fabric-first approach resulted in warm, efficient homes for the Bedmond Road project.  Eurowall®+ can achieve a 0.18 U-value with a 90mm-thick panel in a 100mm cavity. To reach the same thermal performance with mineral wool, for example, the project would require a much thicker insulation. Therefore, Eurowall®+ helps reduce a building’s footprint; a crucial characteristic where plot size is limited.  Indeed, the 10mm air gap, which is created by a 90mm Eurowall®+ PIR board achieving a U-value of 0.18 W/m2K in a traditional 100mm masonry cavity wall, helps speed-up installation times for a more cost-effective build in comparison with other rigid full-fill solutions.Simon Blackham, Technical Manager at Recticel Insulation explained:"Eurowall®+ benefits the installer, due to its slim composition facilitating a more rapid, effective installation, whilst its performance ensures regulation energy requirements are achieved. Such all-round capabilities made it ideal for the Bedmond Road project. It didn’t disappoint on either count."Strong and durable, Eurowall®+ will not degrade or deteriorate due to moisture. This means its thermal performance will be maintained for the long-term comfort and wellbeing of the future occupants of this fine-looking and much-welcome new housing development. About Eurowall®+:Eurowall® + is a premium, high performance full fill insulation board with precision cut tongue and groove joints on all four sides. This ensures that the boards lock tightly together minimising heat loss through thermal bridging. This unique joint offers increased protection against wind driven rain as well as improved windtightness. Eurowall® + is also designed with a 10mm cavity requirement in mind, so that space can be left for conventional bricklaying techniques.

NV Buildings is one of the most prestigious and iconic residential sites in Greater Manchester.The distinctive sail-shaped buildings are a major landmark in Salford Quays. The blocks have a curved main elevation providing a unique aesthetic on the skyline and are one of the most popular developments in the area.With a prominent location in Salford Quays, adjacent to the Lowry Theatre and Media City TV headquarters, the apartment blocks feature in many iconic photos of the area.The project itself was funded by the Building Safety Fund, the Government’s £4.5 billion fund to remove unsafe non-ACM cladding on residential and mixed-use properties that are 18 metres and over and do not meet building safety regulations.Our Approved Installer QFF Facades were contracted to complete the exterior wall insulation and rendering which upgraded the fire performance of the cladding, ensuring the safety of both the building and residents.Three 15 storey blocks were refurbished, with a safe and thermally efficient façade solution.Our ServiceWe worked in close partnership with QFF Facades throughout the duration of the project.Deliveries and install were strictly monitored and a very systematic approach was followed. A planned install programme was agreed to ensure minimal disruption to the residents of N V Buildings, who remained in their homes while the work was carried out on this prestigious site.We produced a bespoke specification which included various detailing such as soffits, balconies, and full height panels.A partnership approach was vital, as we worked with QFF Facades, Thomasons Consulting engineering, and the fire officer to agree upon and deliver specific detailing at abutments, openings, and for the drained cavity of the façade system.Particular attention to detail was afforded to the drained cavity fire-stops, including fire-stop details between floors, at party walls for each apartment and around openings.As part of our service commitment, our technical team were available to provide hands-on-guidance, offer support, technical guidance and ensure high levels of quality.Technical Project DetailsAfter testing, the existing cladding had been deemed a fire safety risk by experts and therefore needed to be removed and replaced with anon-combustible alternative.The project was a strip-and-refit of a drained cavity external wall insulation system, which included an expanded polystyrene insulation system.Our Approved Installer QFF Facades installed a K Systems Exicco M, Drained Cavity External Wall Insulation System for steel frame buildings, utilising Mineral Wool insulation. This high performing system provides high levels of fire resistance and non-combustibility.The fire classification of the façade for N V Buildings was upgraded to A2-s1, d0 and therefore complies with the latest building regulations, ensuring the safety of its residents.For the finish, high-performance thin coat silicone render (Silicone TC) was specified. Our Silicone TC render has a number of fantastic advantages including ease of application, and its hydrophobic properties make the render low maintenance. Available in a wide range of colours the topcoat finish used on NV Buildings is a light grey to match the original façade, meaning aesthetically the iconic buildings maintained their distinctive design.

THE PROJECT: Recticel supplied the high-performance thermal solution to transform a 100-year-old property in Moseley, Birmingham. Divided into nine apartments, in which two were refurbished to create one, two-storey home, the project caught the attention of the producers of Channel Four's Old House to New Home. Connecting a ground floor property to a flat above led to the creation of a modern and stylish home trimmed with decorative reminders of its structural origins.THE SOLUTION: Eurothane® GP, a high-performance rigid PIR foam board, was selected for the new home's pitched roof, framed wall and floor. Eurothane PL, Recticel's insulation and plasterboard solution was fitted to the property's existing, cavity-less, nine-inch exterior brick walls. The well-sized board ensures minimal thermal bridging during construction.Coupled with Eurothane® GP's 0.022W/mK low thermal conductivity, these products were crucial to attaining a good U-value rating. In total, 130m2 of Eurothane® GP and Eurothane® PL panels were installed.The homeowner, Paul explained:"As we were carrying-out most of the building work ourselves we wanted the best possible insulation for the project. Research revealed Recticel's solutions fitted the bill. Excellent thermal performance and simple to-fit, they were a far superior alternative to other insulants we considered. The panels have done so much to create a welcoming and comfortable interior environment."Used products:Eurothane® GP:Eurothane® GP is a high performance PIR insulation board that is light weight, easy to cut, handle and install. Whether it’s a pitched roof, framed wall or floor, Eurothane® GP is the ideal solution amongst contractors and installers.Eurothane® PL:Suitable for mechanical fixing or dot and dab fixing, this insulated board is consistently sized with extremely tight tolerances, ensuring thermal bridging is minimised. Factory bonded, the plasterboard provides optimum board dimensions and optimum adhesion between layers.

Herefordshire Housing Association, announced plans of a five year project with the aim of improving the energy efficiency levels of its entire housing stock, which includes over 500 Cornish type houses across Herefordshire. Many of these homes were built between 1946 and the 1960’s as a ‘temporary’ solution to the post-war housing crisis and they are easily recognised because of their distinctive Mansard roof structure.The contractors, Merriman Roofing and distributor Encon Insulation were given the target of improving the thermal performance of this insulation in the Mansard roofs to a u-value of 0.30 W/m²K, while minimising the disruption to residents which wouldn’t have been possible using traditional means. Because the houses were occupied, all improvement works needed to be carried out from the outside to minimise the impact on the occupants. Unfortunately, due to the Mansard roof which covers the second storey of the building, it’s difficult to significantly improve the energy efficiency of the homes using traditional materials and tools, with a u-value target of 0.30 W/m2.K, traditional insulation was too thick. In the past, efforts to improve the insulation of the Cornish-type homes have been limited by the design of the roof. Achieving a good fit within the timber frame using externally applied options has proved to be challenging due to the narrow cavity between the interior wall and the exterior roof and applying products from inside can typically be disruptive and intrusive for occupants.After visiting the houses that required new insulation, our experts came to the conclusion that our SuperFOIL SF40 multifoil insulation would be the perfect solution to the problem. Because SF40 measures to be just 65mm thick when installed, it was a suitable fit for the unusual Cornish-type properties and their distinctive roofs which only allow a narrow space for insulation. Working with, Herefordshire Housing, Encon and Merriman Roofing Contractors Ltd, we have supplied enough insulation to provide for over 500 houses, improving heat retention in the winter and energy efficiency throughout the year. SuperFOIL worked very closely with Hereford Housing Ltd and Merriman Roofing Contractors Ltd to offer a bespoke solution. SF40 was up to the challenge achieving 0.26 W/m2.K, significantly exceeding their target value. A single layer of SF40 provided maximum performance, minimal thickness, improved air-tightness, radiant barrier, huge cost savings and less disruption to the residents.

For what is one of London’s tallest residential towers, Siderise, leaders in the development of fire, thermal and acoustics insulation solutions, has provided cavity barriers and perimeter fire seals as part of the glazed curtain walling system for the Landmark Pinnacle Tower.

BackgroundLocated in the Ancoats area of Manchester, the Albion Works strip and re-fit project was funded by the Building Safety Fund, a Government Fund to remove unsafe non-ACM cladding on residential and mixed-use properties that are 18 metres and over and do not meet building safety regulations.K Systems Approved Installer QFF Façades were contracted to complete the exterior wall insulation and rendering of the 8-storey residential building.The original 60mm EPS system was stripped from the building and replaced with a safe, thermally efficient façade solution, which upgraded the fire performance of the cladding, ensuring the safety of both the building and residents.Our ServiceK Systems provided support throughout the application process for this Building Safety Fund project. The Technical team offered on-site technical and installation support throughout the build process and supported QFF to ensure quality and reliability.We produced a bespoke specification and worked closely with Thomason Consulting and QFF Façades to agree and deliver specifics such as fire stopping and abutment details.From design advice through to installation, we offered a partnership approach which aided a smooth installation process with minimal disruption.Technical Project DetailsThe original sheathing boards were replaced, and the K Systems Exicco M drained cavity façade system was installed. This high performing drained cavity system was specified as a requirement for this steel frame residential building. 60mm mineral wool insulation was specified to retain the line of the existing façade.Fire safety with high rise buildings like Albion Works is of utmost importance and this solution generates high levels of fire resistance and non-combustibility (A2, s1-d0 rating), meaning the latest building regulations were complied with. Additionally, the thermal performance of the building improved with a U-value of 0.28 W/m²K being achieved. Residents will therefore enjoy reduced heating costs and better living conditions.For the finish, silicone thin coat render ensured that aesthetically Albion Works had a clean, crisp attractive appearance. This durable, low maintenance render transformed the outside of the building and will ensure a longlasting finish to the property.

Eye-catching, fire-safe Cavity System 2 and SpeedySlip Brick Façade for Wheatstone House, London Using a new and innovative non-combustible external wall insulation system, SPSenvirowall delivered on creating a fire safe and thermally efficient building. SPSenvirowall provided its innovative new product, the Cavity System 2 to the development, delivering results which are outstanding and produce an intriguing and engaging brickwork façade. To reach the highest standard of fire safety for the external cladding, SPSenvirowall supplied its Cavity System 2 solution for its A2-s1, d0 fire-rated classification in accordance with BS EN13501-1.

NyRock Cavity Slab 032 insulation was specified to meet the specific energy targets.Hallwell by Hugh McGreevy & Sons Ltd is a development of 100 new homes being constructed as part of a larger residential area in Adamstown, Co. Dublin, Ireland.NyRock Cavity Slab 032 - the most thermally efficient stone wool cavity insulation currently available in the UK and Ireland.

To meet the passive fire protection requirements for a new 27 storey high-rise student accommodation in the centre of the thriving Welsh capital of Cardiff, Siderise, leaders in the development of fire, thermal and acoustics insulation solutions, has provided cavity barriers and firestops as part of the curtain walling system.

Location: Finchley, LondonSpecwall was used on the internal leaf of the cavity walls, with a brick tie system fixed directly to the panels, cavity insulation and brick outer leaf, as well as being used to accommodate the difficult curved façades. The installation of the internal walls at Beechwood Avenue needed to begin before the development was made watertight, necessitating a product like Specwall which can be used in all weather conditions. This enabled the required programme savings on the development which allowed it to proceed on schedule.Additionally, the site was constricted and external access was not available, requiring a wall system that could be built from the inside. Specwall satisfied this condition, and furthermore, the installation provided protection for the rest of the internal works to progress before the external masonry followed at a later date.

The University of Salford’s new Science, Engineering and Environmental (SEE) building features a white RainScreen façade, punctuated by contrasting red window reveals with a sloping sill to form recessed windows. While this creates an impactful design statement, it proved challenging when it came to evaluating the RainScreen insulation performance.The thermal performance challengeFrom the outset the designers, in conjunction with the University, outlined a desire for non-combustible insulation. But the feature red reveal details meant there were restricted cavity widths near the windows, which would affect the depth of insulation that could be installed. Several Mineral Wool insulation manufacturers had been unwilling to undertake U-value calculations. This was because it was challenging to understand the weighted U-value across the different façade build-ups and determine the U-value uplift required to compensate for the shallower window reveal areas.Architects Sheppard Robson had previously worked with Knauf Insulation and engaged its Project Specification Team to discuss the challenge and develop calculations.After receiving the plans, Knauf Insulation undertook 3D U-value calculations and confirmed that they could meet the required thermal performance – and crucially it would mean no changes to the design or impact on the cavity widths.Accurate 3D U-value calculationsSo how could Knauf Insulation meet the brief when other manufacturers could not?The crucial factor was the type of U-value calculation used. Most manufacturers use the standard method, which calculates the U-value for the build-up without the metal substructure. Because this method doesn’t consider the effect of the metal penetration through the insulation, a blanket correction factor is added, which can lead to the under- or over-specification of insulation. Either way, it means that the insulation used in the finished project may not deliver the thermal performance that has been specified. And in the case of the SEE building, calculating the weighted U-value to prevent this was critical.Knauf Insulation uses numerical modelling (also known as 3D U-value calculations) as standard for all RainScreen façade projects. This methodology thermally models the build-up taking into account the complex interaction between the insulation and the bars and brackets of the steel framing system (SFS). As a result, it creates the most accurate available picture of how the build-up will perform thermally after construction.For the SEE building, the team undertook several different calculations changing elements of the build-up, including the substructure material and insulation widths, until they determined the optimal combination.High performance insulationBy using this rigorous calculation method, Knauf Insulation was able to meet the brief with a combination of 50mm and 160mm Rocksilk® RainScreen Slab, along with 200mm OmniFit® Slab 35.Rocksilk® RainScreen Slab is a Rock Mineral Wool slab that is BBA certified for use at any height and for the broadest range of thicknesses and build-ups on the market. It has a thermal conductivity of 0.034 W/mK.OmniFit® Slab 35, a Glass Mineral Wool slab with a thermal conductivity of 0.035 W/mK, is ideal for use in the SFS.Both Rocksilk® RainScreen Slab and OmniFit® Slab 35 are non-combustible with the best possible Euroclass A1 reaction to fire classification so they will not contribute to the development or spread of fire should it occur. Thanks to their sound absorption characteristics, critical for low mass rainscreen structures, they will help create a quieter environment for the computer and science labs.A sustainable solutionThere was one other specification factor to consider – sustainability. The SEE building had been designed to minimise its environmental impact in line with the University of Salford’s campus master plan.Matthew Taylor, the project architect from Sheppard Robson, noted: “From early on, sustainability has been high on the SEE building agenda, including becoming one of the first all-electric University educational building.” The building will also be supported by photovoltaic panels on the roof.But while the use of renewable energy sources and high performance insulation will help lower the building’s operational carbon, it was important to keep embodied carbon to a minimum.Here Glass Mineral Wool scores highly too because it has the lowest embodied carbon of any mainstream insulation material.Knauf Insulation has proactively reduced the embodied carbon in its products over the years, as part of a broader set of activities to reduce its environmental impact. Specific actions to minimise its carbon footprint include initiatives to reduce road miles in both sourcing and distribution.For example, its Glass Mineral Wool products are manufactured using up to 80% recycled content, including glass collected from the local communities around its factories. The finished products are then compressed by up to 10:1 to fit more product into each lorry reducing transport related carbon emissions.Another innovation is ECOSE® Technology, its unique bio-based binder contains no added formaldehyde or phenol. It is made from natural raw materials that are rapidly renewable and is 70% less energy-intensive to manufacture than traditional binders, so it is more environmentally friendly.Products made with ECOSE® Technology are also soft to touch and easy to handle. They generate low levels of dust and VOCs and have been awarded the Eurofins Gold Certificate for Indoor Air Comfort.Ongoing supportThe through-wall build-up was installed by Metclad Contracts. As this was the first time they had worked with Rocksilk® RainScreen Slab, they also turned to the Specification Team for installation advice. They wanted to know whether the insulation should be fixed into the sheathing boards or the SFS.Knauf Insulation provided details of the fixing pattern together with the installation guide. They also facilitated meetings with their fixing partner to provide specialist technical support about pull out values and requirements for fixing into the substrate.Thanks to Knauf Insulation’s extensive technical expertise and ongoing support, the vision for the University of Salford’s state-of-the-art SEE building has become a reality – without any compromise on thermal performance, fire safety, acoustic or sustainability.

Charlotte and her family have always enjoyed living in their Edwardian terraced home in Wimbledon, although after spending lockdown with their two young daughters, they realised they needed more indoor space. The couple decided to complete a rear extension to create more space. Built using H+H Celcon Blocks the extension has made the house noticeably warmer and improved the sound insulation.The finished extension houses the kitchen and dining area, as well as a large corner sofa. Charlotte notes, “I’m actually pursuing a career in interior design, so I worked closely with Westminster Building Company to ensure the space is both warm and inviting. My partner and I love cooking and dining in there now, and our kids certainly enjoy the extra space.”“H+H is a big name, so I didn’t give it a second thought when using their Celcon Blocks. I knew I was buying good quality building materials that are light to handle and easy to use.” “Technically speaking this was a job that required some forethought, as the homeowner wanted the extension to be future proofed for building up a storey. Also, one of the next door neighbours was planning for a rear extension to their home. “This meant that we built a 300mm wall with two layers of 100mm Celcon Standard Blocks (3.6N/MM2) with a 100mm cavity wall insulation and used Celcon Block High Strength Grade (7.3N/mm2) on the inner skin. This was both to facilitate future upward building and to ensure that the neighbours plans weren’t mitigated.” Will Clark, Director, Westminster Building Company.The floor to the extension was created using an Insulated Beam & Block construction, using Celcon Block Standard Grade 100mm blocks. 

Working with Miers alongside Mulalley and Woodhurst Brickwork Contractors on 132 new build properties in Barnet, Metz Non Combustible Cavity tray has been chosen Metz Non combustible cavity tray's flexibility onsite is a key component in the installation and speed of work.Another great project Metz is proud to be involved with.

Knauf Insulation has been appointed as Bellway Homes’ insulation partner for an innovative project to measure the impact of low and zero carbon (LZC) technologies on energy consumption. Bellway’s experimental house ‘The Future Home’ has been constructed within Energy House 2.0, a controlled environmental chamber located at The University of Salford. Energy House 2.0 is the largest research facility of its type, with two chambers able to accommodate two detached houses each. The controlled environment can recreate a wide variety of weather conditions, with temperatures ranging from -20˚C to +40˚C, as well as simulated wind, rain, snow, and solar radiation. This allows housebuilders to monitor the performance of different builds and LZC technologies through year-round conditions, in just a matter of weeks, aiding the transition to net zero design. We spoke to Jamie Bursnell, Technical and Innovation Manager for Bellway Homes, about the aims of their forward-thinking project: “We want to identify the sweet spot where fabric is optimised alongside space heating and energy-efficient services, like solar photovoltaics and battery storage. Finding the best combination of these elements will allow us to design homes that are energy efficient and economically sustainable, both for developers and homeowners.” The Future Home Bellway’s ‘Future Home’ is a three-bedroom timber frame house, built to the current Part L 2021 (England) standard. A specification upgrade is scheduled to take place mid-way through the trial, increasing the build’s energy efficiency to an indicative 2025 Future Homes Standard. “Ultimately, our aim is to optimise the U-values of the home” Jamie explained, “but that needs to be based on real, in-use data, not just notional designs. With the home up and running, we’re now measuring its in-use energy performance against our design. After the mid-trial upgrade, we’ll measure again to see the impact on the build’s overall energy efficiency.”  Bellway is using sensors within the home to monitor its performance under a range of environmental conditions. To do this effectively, Bellway needed a reliable, high-performing fabric, capable of meeting both current and future building standards. Optimal results They turned to Knauf Insulation, who provided product advice, design input and U-value calculations to determine the best insulation for the job. For the initial build, Loft Roll 44 glass mineral wool insulation has been installed in the loft. FrameTherm® Roll 35 has also been installed to meet U-values of 0.18 W/m2K in the external walls. During the mid-way trial, upgrades will be made to the insulation, to reduce the external wall U-value and help reduce air movement within the cavity, which can negatively affect thermal performance.  Jamie noted, “Knauf Insulation has provided technical assistance to a very high standard and their U-value and Psi-value calculations are always reliable. We chose products from their Loft Roll and FrameTherm® ranges because they combine quality performance with cost-efficiency, both of which are essential to the success of our project.” Energy House 2.0 and The Future Home allow us to see how LZC technologies could be most effectively implemented in future years. But the insulation requirement will remain unchanged; reliable thermal performance will continue to be an essential component of any energy-saving home and it’s already available today, with the right specification. Learn more about Part L and the housebuilding sector, at our Housebuilders Hub

Damage from the build up of moisture results in mould, mildew and condensation on windows and in the loft space. Additionally, where there is a moisture problem in the wall cavity, damage readily occurs to the insulation and wall ties, affecting wall plates, the timber frame itself and installed joinery. Preventing this from occuring is obviously a priority in the minds of all designers and builders interested in quality construction. SureCav Provides the Solution. By building with the SureCav panels instead of a using a block leaf you are providing a barrier to protect from wind driven rain.

Building performance is crucial if the UK is to meet its ambitious net zero targets. But there’s a big challenge ahead. There are 29 million homes in the UK and buildings generate one third of the UK’s CO2 emissions, 50% of which relate to heating.To address this, the government has announced a clear regulatory roadmap introducing ever-stricter thermal performance requirements.But there’s a bigger issue that tougher thermal performance measures alone will not address. Industry research suggests 27 million homes are not delivering the performance stated on their Energy Performance Certificate (EPC). That’s because EPCs require no physical measurement on site, assumptions are made based on answers to questions such as whether a property has insulation or a condensing boiler. It does not account for any of the variables that influence actual performance, such as build and install quality or location. This means homes are less energy-efficient, use more carbon and are more expensive to run than their EPC suggests. As a result, the Government’s EPC Action Plan will see EPCs shift from being a notional tick-box exercise to a genuine, evidence-based record of a building’s actual performance.That leaves the construction industry with a problem. How will it ensure buildings actually perform as designed?A genuine, evidence-based recordThe only way to address the issue is to measure real energy performance, but this has been difficult and costly – until now. Knauf Insulation and Knauf Energy Solutions have undertaken two pilot projects which have combined accurate measurement and Artificial Intelligence (AI) technology with a quality-controlled retrofit of Mineral Wool insulation to deliver impressive results.The solutionThe two companies have invested in six years of research and development. The result is ground-breaking sensor technology that accurately measures the real energy performance of a home, which is used alongside quality-assured installation of retrofit measures to create buildings that perform as intended.Until now real performance could only be measured via expensive, lengthy, and invasive co-heating tests. By contrast, Knauf Energy Solutions sensors can be fitted unobtrusively to occupied buildings, making the technology discreet, scalable, and cost-efficient.Over 12 weeks, the sensors capture an accurate picture of the building’s performance using machine learning to combine energy meter readings with humidity, temperature, CO2 levels, Volatile Organic Compounds (VOCs), and weather data. It then calculates the heat lost through the building roof, walls, and floors to create an accurate picture of each home’s thermal performance. It essentially gives an ‘mpg’ for a home or building.The sensors can be used to ensure new buildings are performing as designed and specified. Or they can inform ‘smart retrofits’ that improve existing buildings’ energy performance and track the subsequent energy bill savings.Retrofits that deliver resultsKnauf Insulation and Knauf Energy Solutions have undertaken the UK’s largest ever real performance retrofit project, to upgrade the thermal performance of 28 homes on a 1970s social housing estate run by Great Places Housing Group in Trafford, Manchester. Early investigation showed the existing insulation had been incorrectly installed and had degraded. Adding to the complexity, the homes also contained unusual build features, such as a stagger between terraces meaning one wall acted as both a party and external wall, each with different thermal characteristics. The companies built a full-scale mock-up of the junction to develop clear protocols for the removal of existing insulation and installation of Knauf Insulation Mineral Wool products. This innovation has enabled the successful installation of Supafil® Party Wall in a staggered party wall – a world first which can be replicated in tens of thousands of other ‘hard to treat’ properties with similar staggers across the country.The second project took place in Eccles, Salford, where the 12 houses had been built to Part L1A in 2014.Sensors were used to benchmark the thermal performance of the properties before commencing quality-controlled refurbishment programmes on both estates, using Knauf Insulation products including Supafil® 34, Supafil® Party Wall, Loft Roll 40 and Rocksilk® RS100.The retrofits were ‘cost-optimal’ delivering results usually targeted by whole-house retrofits with only fabric improvements. To achieve this, the standard of installation was key. Contractors were chosen and managed for quality, and included approved Supafil® contractors, who are certified and actively monitored by Knauf Insulation. Supafil® 34 was injected directly into the cavity using a calibrated blowing machine, ensuring each cavity was fully filled so the specified thermal performance could be achieved. Loft installations were carefully designed and installed so the Loft Roll 40 met up with the Supafil® to provide continuity of insulation and minimise thermal bridging.The two pilot projects delivered impressive results.Trafford31% average fabric efficiency improvement per homeOne home experienced a 51% improvement£411 average annual bill reduction for residentsAverage space heat demand: 65.57 kWh/m2yearAverage CO2g/m2/year: 14.23Eccles17% average fabric efficiency improvement per home28% improvement in one semi-detached homeMoist air leakage risks corrected, preventing sustained structural deteriorationAverage space heat demand: 32.79 kWh/m2yearAverage CO2g/m2/year: 6.78The need for a fabric first approachAccurate measurement alone will not create net zero homes – despite the improvements, all 28 homes in Trafford retained EPC ratings of grade D or E. Similarly in Eccles, the EPC ratings remained mostly static. The refurbishments simply brought their real-world performance in line with the theoretical EPC performance.But the project does show that Knauf Insulation and Knauf Energy Solutions have developed a viable solution for measuring real performance that can be used to underpin net-zero housebuilding and retrofitting by taking a fabric first approach.Bringing benefits to the whole supply chainBefore the refurbishment, residents on the Trafford estate regularly complained their homes were cold and expensive to heat, despite being insulated. In fact, a survey by energy supplier E.ON found this is common, with 49% of landlords saying they didn’t know how to improve the energy efficiency of their properties. This new technology not only gives landlords that information, but by making real-world measurement viable at scale for the first time, it brings benefits to the whole supply chain:Housebuilders can ensure quality control and compliance with the ‘fuel and energy performance’ aspects of the New Homes Ombudsman scheme.Builders and developers can measure thermal performance with certainty and demonstrate they’re delivering for their clients.Tenants and purchasers will enjoy better thermal performance, lower energy bills and a more comfortable living environment, and they can also assess the operating costs of prospective homes.The government, councils, housing associations and landlords can verify the return on investment on refurbishments.Ultimately if we are to achieve net-zero, we must first accurately measure building performance. By combining the use of sensor technology with a quality-controlled insulation installation or retrofit, we can close the performance gap of every building – new and existing. The building fabric component of an EPC will be based on real evidence and homeowners and tenants can save money with lower energy bills.Low carbon insulation for low carbon homesKnauf Insulation undertakes Life Cycle Assessments to evaluate the embodied carbon of its products. Its products can be considered low in embodied carbon, with transparent evidence available in Environmental Product Declarations (EPDs) across its ranges.Knauf Insulation has proactively reduced the embodied carbon in its products over the years, as part of a broader set of activities to reduce its environmental impact. Specific actions to minimise its carbon footprint include the introduction of ECOSE® Technology, its unique bio-based binder, which is 70% less energy-intensive to manufacture than traditional binders, as well as initiatives to reduce road miles in both sourcing and distribution. Its Glass Mineral Wool products are manufactured using up to 80% recycled glass collected from the local communities around its factories, and the finished products are compressed by up to 10:1 to fit more product into each lorry reducing transport emissions.“From day one, Knauf Insulation brought a level of quality control we haven’t previouslyexperienced in other projects. The measurement service is the first time wehave been offered any certainty that our homes have actually been improved.”Sarah McClelland, Environmental Manager, Great Places

Located on the former BBC site, Circle Square in Manchester aims to create a vibrant neighbourhood comprising city living apartments, prime office, retail and leisure space. Phase two of the development saw the construction of No’s 5 to 8, four buildings totalling 677 luxury flats with private dining, resident lounge, gym and cinema, as well as commercial space. Specification requirements FK Group were appointed to design and install a bespoke façade solution which meant they were responsible for specifying the insulation. There were three main performance factors that needed to be considered.  Firstly, the insulation had to be non-combustible to ensure compliance with building regulations in England and Wales, which ban the use of combustible materials on the external walls of certain buildings over 18m tall.  The second consideration was thermal performance. “When you’re designing a bespoke façade solution, accurate thermal modelling is essential because there are so many variables that can affect its energy efficiency,” explained Ben Hufton, Associate Design Director of FK Group. “One of the reasons we work with Knauf Insulation so much is because of their technical support. They always conduct 3D U-value calculations for rainscreen façade projects, so we know the insulation will deliver the performance we need to achieve.” This enhanced level of accuracy is one of the main benefits of 3D U-value calculations over other calculation methods, because it ensures a building’s real world thermal performance matches its initial design.  To achieve the required U-value of 0.28 W/m2K, the Knauf Insulation Technical Support Team recommended 200mm Rocksilk® RainScreen Slab for the external cavity. This has a thermal conductivity of just 0.034W/mK. Rocksilk® RainScreen Slab is manufactured from Rock Mineral Wool and is BBA certified for use in high rise buildings for the broadest range of build-ups of any rainscreen solution on the market. It is also non-combustible with the best possible Euroclass A1 reaction to fire classification. This means it will not contribute to the development or spread of fire should it occur. The final specification factor was acoustic performance due to the site’s busy city centre location.  FK Group conducted offsite acoustic tests to ensure that the build-up met the requirements of Approved Document E. The Mineral Wool insulation contributes significantly to the acoustic performance of the build-up thanks to its open structure. Sound waves are trapped between the individual strands of Mineral Wool and turned into heat energy. This will help to reduce noise from surrounding roads, ensuring residents can enjoy peaceful homes. Other performance factors As it has been developed for external applications, Rocksilk® RainScreen Slab contains a water repellent additive which is combined with a fibre matrix that promotes run-off. This ensures it can resist moisture ingress whilst maintaining its excellent vapour permeability. The physical characteristics of the fibres are unaltered if they get wet. Therefore, the thermal properties of Rocksilk® RainScreen Slab are not affected by exposure to moisture and the product will perform as expected once it has dried out. The product is easy to install correctly thanks to superior robustness and durability, allowing it to be manoeuvred easily into place. Its natural flexibility means it adapts to minor imperfections in the substrate, while slabs interlock, eliminating air leakage that could reduce thermal and acoustic performance. Rocksilk® RainScreen Slab is also manufactured with ECOSE® Technology, Knauf Insulation’s unique bio-based binder that contains no added formaldehyde or phenol. It is made from natural raw materials that are rapidly renewable, and is 70% less energy-intensive to manufacture than traditional binder, so it is more environmentally-friendly. Products made with ECOSE® Technology generate low levels of dust and VOCs (volatile organic compounds) and have been awarded Eurofins Indoor Air Comfort (Gold) certification. Circle Square will give residents access to everything they need from a community district – just as Knauf Insulation’s Rocksilk® RainScreen Slab ticked all the boxes for FK Group.

The refurbishment scheme at Buckley View in Smallbridge was completed in March 2022 and is one of a series of demonstrator projects that Rochdale Boroughwide Housing are completing.These projects are part of an ongoing approach to improve the energy efficiency of homes and reduce carbon emissions, helping to identify the best ways to meet Greater Manchester’s 2038 target to be carbon neutral.The scheme has seen 23 bungalows in Buckley View receive investment to help improve the energy efficiency of the homes and reduce carbon emissions using a whole-house, fabric first approach.The work carried out included replacing cavity wall and roof insulation, installing External Wall Insulation (EWI), upgrading ventilation and installing new windows and doors.We worked in close partnership with our approved installer Profac and provided a suitable EWI solution for the project and complementary finish. A brick slip finish was utilised, which was supplied in three colours to totally refresh the facades.The bungalows in Buckley View were totally transformed and will enjoy increased energy efficiency, improved thermal comfort, reduced fuel consumption for residents and, as a result, lower carbon emissions.Our ServiceK Systems prides itself on having an inspiring and effective solution for every style, and this project is just one example of how it provides the flexibility to fulfil any specific design criteria.We tailored the specification process for the project based on the set and very specific requirements of Rochdale Boroughwide Housing and its properties, and every single request / objective of the client was not only met but exceeded in the refurbishment.The design and delivery of the refurbishment not only received 100% satisfaction ratings from all parties involved, but has also gained external recognition for its excellence and already been shortlisted for three prestigious industry awards:Large Scale Project of the Year at the North West Energy Efficiency AwardsSustainability Project of the Year at the Aico HomeLink Community Awards 2022Best Retrofit Initiative at the Northern Housing AwardsOverall, an outstanding and successful refurbishment by our team that has given Buckley View in the North West a new lease of life.Ryan Robson at Rochdale Boroughwide Housing, said:“We are delighted and incredibly proud to have worked on the refurb project at Buckley View which has been recognised with three award nominations so far. These nominations are a testament to the great partnership approach by all involved parties, the highest levels of construction quality showcased throughout, and the exceptional performance outcomes of the entire project, for the housing residents, housing provider and for the wider area.”Technical Project DetailsThe external façade and sheathing boards on the existing, poorly insulated timber frame structures were removed. The sheathing boards were replaced with A1 rated carrier boards and the K Systems M, Mineral Wool Insulation System was specified.This system not only generates exceptional thermal performance and provides high levels of fire resistance (A2-s1, d0), but also boasts exceptional environmental qualities – by choosing it, we not only demonstrate our innate understanding of best-suited solutions but our dedication to sustainable working.The bespoke system specified for Buckley View was designed using 110mm non-combustible mineral wool insulation to meet the desired u-value of 0.20W/m2K, improved from 0.43W/m2K. This meant homes were more energy efficient, warmer, and less expensive to heat – a major bonus given the current cost of living crisis.For the finish, we specified a unique finish of VBriQ+ clay brick slips. This cost-effective, lightweight traditional clay brick slip system replicates traditional brick construction on low-rise buildings like the Buckley View bungalows.Our unique and innovative VBriQ+ clay brick slip finish was specified due to its robust, durable characteristics and wide range of colours. The brick slips were supplied in three colours, which totally transformed the facades aesthetically and with their low maintenance and element resistance qualities, will ensure the homes avoid cracking and maintain their appearance over time.At K Systems we are confident that we have the inspiring solution for every style, and this project is just one example of how we provide the flexibility to fulfil any specific design criteria.We tailored the specification process for the project based on the requirements of Rochdale Boroughwide Housing and their properties. Bespoke technical detailing included use of pistol brick slips around window reveals with a soldier course detail specified above window heads to create a contrasting aesthetic feature to the main walls. A band of silicone thincoat render was added as a design feature around the doors– yet again showcasing K Systems’ unrivalled attention to detail.

A wonderful new 10 year development utilising Metz non combustible cavity trays through out this prestigious project, on behalf of Berkley Homes.

Located in East London, on a water gateway between the River Thames and over 2,000 miles of navigable canals, the six-building Limehouse Basin development comprised of a white EPS insulation board that was fixed to horizontal PVC rails that created a drained cavity between the insulated façade system and the substrate.Due to strict regulations introduced in December 2018 following the Grenfell tragedy, which states any building exceeding 18 metres in height must have walls comprised of non-combustible materials, this building was deemed non-compliant, unsafe, and not fit-for-purpose.Development owners Beckford, supported by the Building Safety Fund (BSF), required an expert team to execute the removal of the existing EWI and replace it with an appropriate alternative, without disrupting the unique aesthetic of the building.The combination of K Systems and Retrofit UK, two companies renowned for their expertise, quality of service, and superiority in the market, was an obvious choice for Beckfords.We have a good portfolio of BSF projects to date, and Limehouse Basin is another great example of how our team along with one of our approved installers can help make a building fit for purpose, whilst overcoming numerous challenges along the way. Unrivalled expertise and professional delivery are apparent in every groove and corner of this refurbishment.Our ServiceTogether with Approved Installer Retrofit UK, K Systems continued works despite Covid restrictions (adhering to Government guidelines) to deliver the Limehouse Basin project within the agreed timeframe and with minimal disruption to residents as requested by the client.Removal of the existing EWI system took place in rotation with the installation of the new system, and a robust programme was put into place by the contractor to ensure the building was not exposed to the elements for long periods of time, ensuring the residents were kept as comfortable as possible especially during the winter months. Decanting of the residents did not take place, so we worked alongside all parties to ensure the health, safety and welfare of the residents were prioritised during the works.Due to the nature of this project, technical monitoring from the K Systems team was increased, and weekly visits were planned along with a reactive approach to any on-site issues that arose from a technical perspective. Our technical teams actioned regular quality assessments and maintained open communication with all stakeholders.The result – an industry-leading insulated façade solution that fulfilled Beckfords’ criteria and delivered an outstanding architectural design and structure, fully compliant with fire regulations and boasting a better U-value which translates to better living conditions for the residents.Technical Project DetailsThe key objective for the Limehouse Basin project was to remove the non-compliant EWI system and replace it with a non-combustible system to meet current building regulations.Our team insist on being involved from the very concept of any BSF project to ensure an accurate specification could be developed and allow any initial underlying issues to be identified and rectified swiftly. Therefore, our Technical Team witnessed the removal of the existing system and inspected the substrate thoroughly.After extensive scoping, the K Systems M, mineral wool insulation, system with a silicone render finish was chosen as the preferred option, meeting the demands and needs of the client and current building regulations. This system provides high levels of fire resistance and non-combustibility (an A2-s1, d0) bringing it in line with mandatory Government requirements for buildings over 18m tall.With superb acoustic qualities and excellent environmental properties, the M System didn’t just tick the fire resistance box. The thermal performance of the building was significantly enhanced, with a U-value of 0.30W/m².k being achieved.The shape of the buildings were complex, with numerous curved areas of various facades. This meant the finish required an expert eye and a skilled hand to deliver seamlessly. Both K Systems and Retrofit are renowned for their expertise and superiority in the market, and therefore such challenges were overcome, and high standards of workmanship delivered.Another very challenging aspect of the build was the replication of the rainscreen cladding to the front of the buildings. This detail was successfully created by using tape joints, stop beads, and black silicone mastic to create a shadow gap – further testament to the expert capabilities of our team. This particular finish not only delivered the desired aesthetic but delivered an additional benefit of cost savings for the client.We worked closely with Retrofit UK throughout the duration of the refurb and as a result the Limehouse Basin buildings have a contemporary finish and attractive aesthetic worthy of the projects postcode, and one we are confident existing residents welcomed and potential residents appreciated.