"truss"

Truss roof rafters and ceiling joists are typically spaced either 400mm, 450mm or 600mm apart. Given that the joist is normally 50mm wide, this gives a fairly small opening width for your loft hatch and ladder. However, there are still a wide variety of options to consider. For example, space saving concertina loft ladders, are easy to operate, providing robust and durable access to an attic. Made-to-measure folding wooden loft ladders, such as the new Quadro, are available for widths of 550mm and offer minimal protrusion in the loft space above. Visit our website for more information.

Donaldson Timber Engineering Ltd designed and supplied these impressive curved top chord trussed rafters, to form the contoured roof of a Tesco Express store in Dunfermline. With six locations across the UK, Donaldson Timber Engineering use MiTek's engineering software and connector products to design and manufacture their roofs and floors throughout the UK

Some 92,000 Cwt Y Bugail slates feature on a ground-breaking new/old roof. Formerly a seedy area worth avoiding, London’s Kings Cross has now been transformed into a go-to destination for office workers, students and tourists. Developer Argent’s regeneration of the area has sensitively re-purposed the early Victorian railway buildings into variously, a college campus, supermarket and offices, in which the interior changes are radical but the exteriors have been left largely unaltered. Not so for Coal Drops Yard, a pair of elongated Victorian coal warehouses originally built to distribute coal from the North of England across London. Here, the pitched roofs of two almost-parallel buildings, 150m and 100m in length and 39m apart, have been reconfigured to curve up at their northern ends and gently kiss each other. Designed by Heatherwick Studio, the roofs peel upwards and extend into the middle of the space between the two buildings. A new floorplate sits below the roof structure, with glazing filling the gap between the two, creating a third level of retail. The new roofs of the ornate cast-iron and brick structures have been slated with 92,000 new versions of the original Welsh Slates – 500mm x 250mm Cwt Y Bugails from the manufacturer’s Llan Ffestiniog quarry in North Wales – by Banbury-based specialist sub-contractor Attleys Roofing. Attleys already had some Kings Cross experience, using 6,400 500mm x 300mm Heather Blues from Welsh Slate’s main Penrhyn quarry for the re-roof of the nearby German Gymnasium - the first purpose-built gym in England - which is now enjoying a new lease of life as a designer restaurant. Coal Drops Yard was a whole new ball game, testing Attleys to the limit, but the result is an extraordinary reinterpretation of the canal-side site. Main contractor BAM Construction was responsible for the structure of the new roofline. More than 50 new steel columns were carefully threaded through the existing structure to support the roof independently of the building, a point cloud survey being carried out to help calculate where to put the columns without clashing with the existing building fabric. Primary support is provided by a set of large cranked beams supported on cores in each building which join in the middle over the yard. There are four primary beams, two on each building. These dip down towards the centre to create the valley between the two roof structures and have been nicknamed “giraffe beams” in reference to their angled neck and head - the structure looks like two giraffes rubbing noses together. Tie beams at floor level take the tensile loads generated by the weight of the roof. The giraffe beams support two ribbon trusses that define the upper and lower edge of each roof structure and connect in the middle over the yard at the lower edge. These are 7m deep in the middle and taper to 5m at the ends where these join the existing roof. Tubular steel sections were used to create the trusses because of the complex geometry. The new floorplate below the roof is suspended from above using macalloy bars and is tapered towards the perimeter to minimise the impact on the view. More than 60 panels of full-height structural glazing between the floor and new roof are stepped rather than curved or faceted for aesthetic reasons and has the added benefit of hiding the macalloy bars. Temporary trusses were erected to support the giraffe beam assembly and ribbon trusses during construction. The giraffe beam assembly was erected first. The ribbon trusses were brought to site as components, bolted together on the ground into fully-assembled sections complete with rafters, craned into position and bolted together where they meet in the middle. The whole roof structure was then de-propped. Visually, it was important to maintain a seamless transition from the existing roof to the new section so the original timber roof trusses were retained where possible, with some localised strengthening required where the timber had been damaged. The gap between the existing and new roof structure was then boarded over ready for the new Welsh slates.The two roofs are bolted together where they meet in the middle. Heatherwick Studio chose to position the new roof element at the northern ends of the two buildings as the eastern building had been devastated by a fire in 1985. Used more recently for warehousing and nightclubs, they were largely abandoned in the 1990s. Group leader Lisa Finlay said: “Our challenge was to radically remodel this Victorian infrastructure to meet the needs of a modern urban development without losing what made them special. To do this, we focused on understanding their original function and how they were adapted over time so we could appreciate how best to preserve and reuse the existing fabric, whilst also introducing new elements. One of which is an entirely free-standing new structure threaded through the historic buildings, from which a spectacular new third level is suspended.”  Attleys were on site for a total of almost 18 months. The roof pitch of the original sections of roof was 28° but as the curves swept around and met in the middle this changed to 47°. Thereafter the length also decreased from 8.4m to 6.9m at the kissing point where the two curved roofs met but the same number of courses of slates (44) had to be maintained. This meant Attleys had to decrease the gauges and not only cut the sides of the slates to take them around the curve but also the tops of the slates to maintain the same number of courses. No clever nailing or hidden bibbing was required to stop rainwater flowing diagonally at this point as the pitch was so steep. Attleys’ managing director Shaun Attley met with Heatherwick Studio and BAM’s design team up to two years prior to commencement on site to discuss the design issues and how to achieve the aesthetics requested while using the products selected.  Shaun advised the project team that the Cwt Y Bugail slates could not be used for their initial roof design which exceeded a 90° pitch so it was re-designed to ensure that where the eaves met it was at a pitch commensurate with Welsh Slate’s fixing recommendations and warranties. Due to space being at a premium, all the Cwt Y Bugail slates were cut off-site at Attleys’ depot in Banbury. To do this, Attleys had to calculate how much of the slates needed cutting off. This was done by taking measurements from the steel work underneath - from steel to steel at the eaves and steel to steel at the ridge which was generally over 10-15m depending where you were on the curve (on the internal curve or external curve). The kissing point determined how the slates were cut to ensure the perp lines and side laps were maintained.  And because the roof pitch was increasing while the rafter length was decreasing, Attleys also had to cut the tops of the slates down so they suited the decreasing gauges. A total of 32,000 of the 90,000 slates used on the project had to be cut with hand guillotines so the dressed edge could be maintained around the curve which comprised 1,600m2 of the total 4,600m2. Shaun Attley said: “Our timescale for the sections of roof was provided to BAM Construction and this was put into their overall programme with all other sub-contractors but unfortunately our commencement on site was delayed due to previous issues in the construction of the steel frame prior to us starting.  “This meant we were up against the clock in trying to pull back time to ensure the overall programme was still met and we were asked by BAM to find ways of doing as much as possible off-site and increasing labour and production on-site to pull back the time lost. By working together with other sub-contractors and the main contractor we managed to finish a week earlier than our anticipated 43-week overall programme.” He added: “The project was challenging at the beginning to ensure we set the roof out properly but as the contract progressed it became easier. Welsh slates are easy to work, and we work with them all the time, but in this case it was challenging getting the slates to course all the way round. Attleys’ SMSTS-trained supervisor ran the day-to-day safety, conducting Toolbox talks every morning and attending daily safety briefings by BAM Construction staff and supervisors from all trades on site to brief each other of any risks and ensure trades were not disrupting one another.  The team of 10 Attleys operatives, which included two NVQ Level 2 apprentices, carried out daily visual inspections of tools and all power tools were PAT tested every three months. Shaun Attley visited weekly to inspect the job for workmanship and production and also to gather feedback on any safety issues or to see if any safety measures could be instigated to improve the overall safety for their and other operatives on site. “We found some of these measures not only improved safety but also helped improve production,” said Shaun. Attleys also had an independent safety inspector (from The Health & Safety People) visit site monthly to see if there were any safety improvements they could recommend. Far from handling eight million tonnes of coal a year, Coal Drops Yard is now forecast to pull in 12 million visitors a year.

As part of an exciting regeneration project in Cardiff, Lowfield Timber Frames specified SMARTPLY PROPASSIV panels alongside a supply of their timber kits for a development of 12 two-bedroom houses in Heath, Cardiff.As part of an exciting regeneration project in Cardiff, Lowfield Timber Frames specified SMARTPLY PROPASSIV panels alongside a supply of their timber kits for a development of 12 two-bedroom houses in Heath, Cardiff.The homes are built to strict Passivhaus standards, offering improved health and wellbeing conditions for occupants whilst requiring very low levels of energy for space heating or cooling. Additionally, using timber frame for the construction lowers the carbon footprint of the development.The major benefit of a Passivhaus build is the reduced energy consumption during the operating life of the structure. This will ultimately lead to reduced energy costs, heating bills, and even lower carbon emissions for the planet.The average air test result for the 12 homes came in at below 0.5 ACH. A Larsen truss panel (a lightweight wall extension which creates extra wall space to a house insulation) was also used in the project. It was 330mm deep with the finished wall make-up being closer to 500mm.Darren Jarman, Managing Director of Lowfield Timber Frames, commented: “The Highfields scheme in Cardiff was just one of several passivhaus schemes we have completed over the past 2 years. We now have an external wall build-up that not only meets the passivhaus standards, but also has extremely low embodied carbon credentials.“The external wall has been fire tested and achieves the airtightness required, all in all, reducing the heating requirements and the running costs of the property.”SMARTPLY PROPASSIV is an airtight OSB/3 panel with integrated vapour control and air barrier properties for use as structural sheathing in timber frame structures. The airtightness is engineered into the OSB panel substrate, whilst the factory applied specialist surface finish technology provides increased and constant vapour resistance on the warm side of construction. The panels are suitable for both new build and renovations.The distinctive green layer of SMARTPLY PROPASSIV is a UV cured coating providing increased and constant vapour diffusion factor. In addition, it provides a smooth and durable surface for taping the connections.The panels made to OSB/3 grade, are moisture resistant and can be used in humid conditions (service class 2). The hygroscopic nature of the OSB panel acts as a humidity buffer to help prevent interstitial condensation within the timber frame structure in limited cases of reverse diffusion.Jarman concluded: “Whilst there are other products available which will achieve the airtightness, we feel SMARTPLY PROPASSIV is the most robust solution available and eliminates the possibility of accidental damage, resulting in a failed test.”The ambitious project is part of the ‘Cardiff Living’ programme, a 10-year partnership between Cardiff Council and Wates Residential, which will deliver 1,500 new homes at sites across the city.Discover more about SMARTPLY PROPASSIV and its applications here: https://mdfosb.com/en/products/smartply-propassivFind out more about Lowfield Timber Frames here: https://www.lowfieldtimberframes.co.uk/Twitter: @LTFltd

Breakers Beach Bar & Restaurant, Noordwijk, The Netherlands. The construction of an upmarket beach bar and restaurant, Breakers Beach House, part of the Grand Hotel Huis Ter Duin. Set amongst the dunes and facing the North Sea, the building was designed to be sympathetic to the environment but required the use of materials that could withstand the elements without requiring frequent maintenance. Accoya Wood was used for windows, doors, cladding, railings, trusses, mullions and planters. “We are delighted with the end result which meets our expectations and those of our customer.” Eline van Leeuwen, Director, Van Leeuwen kozijnen.

Fully compatible products from the range of TBA FIREFLY™ have been chosen to compartmentalise roof voids between apartments and communal lobbies of a large apartment building in the London Borough of Lewisham, providing 120 minutes fire integrity protection as part of a wide ranging refurbishment programme carried out earlier this year.The contract on Lewisham Homes’ Commodore Court in Albyn Road has been led by the sector specialist construction company, Mulalley & Co. with London/Sevenoaks based CLM Fireproofing carrying out the installation of the TITAN Lite™ 120:60 barrier system, in combination with Collaroll and the use of ancillary products from the FIREFLY™ range.CLM Fireproofing was founded 30 years ago by Clive Miles and has established a reputation as a leader in the fields of both passive fire protection and fire-stopping; working in a variety of sectors on projects right across the UK. A regular user of the FIREFLY™ range, many of its operatives have attended courses at the company’s premises in Rochdale to become trained FIREFLY™ installers.The Site Agent for CLM, Virginijus Pasvenskas, commented: “There was initially an intention to use a mineral wool flexible fire barrier, but the product was not tested for the scenario installed around the services such as a downpipe and it was upgraded to the use of the FIREFLY™ system by the client/project team. The installation of the TITAN Lite™ and the Collaroll to wrap the trusses and the services went very well and, as well as supplying specific details for the work, FIREFLY's technical team came to site to inspect the works. We completed our contract on schedule back in the summer.”TITAN Lite™ 120:60 has been developed for use in vertical separation or compartmentation situations, offering 120 minutes integrity and 60 minutes insulation and is able to be sealed around penetrations. It is widely specified to form fire barriers within roof voids and floor voids in many different property types, including tower blocks and other HMOs.The flexible woven material is easy to cut and fix, and is chemically treated to improve its cooling properties and therefore prevent temperatures rising in adjoining areas. The system has been fully tested to BS 476 Parts 20 & 22 and is third party certified by IFC. The six metre long rolls of TITAN Lite™ 120:60 have a minimum thickness of 6mm and are installed using special staples as well as high temperature adhesive.Employed as part of the FIREFLY™ System and also to wrap the services which penetrate barriers such as PHOENIX, ZEUS Lite™ and APOLLO Lite™, Collaroll comes in a roll which unwraps to 10m long x 300mm wide with a sewn in concertinaed skirt. The skirt can be moulded to shape to seal it neatly to the upright barrier, which is usually at 90 degrees to the Collaroll and fixed into place using the FIREFLY™ high temperature adhesive. The R31 Staple Gun and Staples are used to staple the Collaroll to itself tightly around the penetration.

Two types of Welsh Slate feature on the new roof of London’s Irish Embassy. The £2.5 million re-roof of the Grade II listed Irish Embassy in London, with more than 10,000 Penrhyn Heather Blue slates from Welsh Slate, has required its own exceptional levels of diplomacy. DarntonB3 Architecture had multiple challenges to factor in when it came to specifying the replacement slates, including the City of Westminster’s planning department, which was keen to see as many of the existing slates re-used as possible and required convincing to embrace the “new” metric sizes. Then there were landlords Grosvenor Estates, leaseholders the Department of Foreign Affairs and Trade, and Historic England, not to mention the site being opposite Buckingham Palace, on a “Red route” with diplomatic bays nearby, and between two of the most important Conservation Areas of Belgravia. Work began on the landlocked Grosvenor Place site in March 2018, a year after DarntonB3, who are specialist conservation architects, were appointed to oversee the project, and has just completed (January 2019). Two types of Welsh slates have been used on the former terraced town mansion with decorative metal roof crest that was designed by architect Thomas Cundy, who was surveyor to the Grosvenor Estate at the time, and built in 1868 in a French Renaissance style. Roofing contractor Mundy Roofing was involved at an early stage in the project and were ultimately appointed as principal contractor. Specialising in leadwork and natural slate roofing, they were pivotal to the project’s success. A total of 600m2 of County-grade 500mm x 300mm slates have been used on the numerous standard 30° to 35° pitched roofs while Capital-grade bespoke arrow-head slates of the same colour but sized at 400mm x 250mm were used around dormer windows on the 80° mansard roof elements that are reminiscent of Paris and feature lead secret gutter detailing around the perimeter. There is also some vertical slating to the rear elevation.  The old 5mm to 7mm thick slates had been on the roof since it was first built 150 years ago. The rectangular ones had been slightly longer and narrower, at 510mm x 255mm, while the arrow-head slates had been smaller all round, at 350mm x 200mm.  But a roof survey showed they were not laid to the correct bond or headlaps and fixing points were far from ideal and non-existent in places (the headlaps between 0 and 50mm), leading to the hardened sarking underneath becoming sodden in places. In fact, most of the roof had been repaired over the years with different types of slates using temporary lead tags or painted with a bitumen solution in an attempt to prolong its life. DarntonB3 argued that if the roof was re-installed as existing, its appearance would alter as they would have no option but to lay the slates at the correct headlap which would create additional courses. In addition, using the slightly larger arrow-head slates for the mansard roof would enable them to form a more robust detail at the abutments to the dormers and party wall.  Home to the Irish Embassy for the past 70 years, the building comprises office and entertainment space. The traditional timber truss roof featured timber sarking boards with penny gaps, a form of construction usually found in Scotland. The slates were then fixed with copper nails directly to the boarding without any timber battens. Once city planners had agreed to 100% replacement of the Welsh slates, at the new metric sizes (a process that took a year), the addition of timber counter battens, to improve ventilation of the roof and prolong the life of the new slates, was also proposed by the Architects. Mundy Roofing produced sample comparison mock-ups to demonstrate to the conservation officer this change would not be detrimental to the building’s character. As it is, the interface details where slates have been lifted has not altered the character of the building and the introduction of battens would not be known by the general observer.  DarntonB3 senior associate Matthew Jones, who was project manager and lead architect throughout, said: “Westminster City Council are regarded as one of the leading conservation-led councils in the UK, with some of the highest standards and criteria to meet, and dialogue with the conservation officer was detailed and robust. The need for wholesale replacement of the existing slate due to them being at the end of their life was a delicate decision and sufficient evidence of this necessity was proven. The replacement of the slates with metric sizes was also an extensively discussed item but the principal contractor and Welsh Slate worked with us to develop the narrative.” Keith Hamilton, an architect accredited in building conservation, acting for DarntonB3 alongside Matthew was reasonably sure Welsh slates had been used previously but was keen to ensure the correct thickness and grading were eventually used throughout the renewal process.  He said “We have specified Welsh Slate on numerous other projects and their reputation for the highest quality precedes them. We were able to argue the merits of increased ventilation behind the slates using cross battening in lieu of direct nailing to the existing sarking board, which in the majority of areas had survived over 150 years’ performance. “The risk of lack of ventilation on the lower roof pitches behind the slates was particularly relevant at the eaves and head. We had previously considered introducing slate vents and felt underlay to augment any need for ventilation but the existence of the ‘penny gaps’ in the sarking boards encouraged us, to believe that this was not required.  “This was another point of continued discussion with the conservation officer who was against an underlay in this instance. The timber sarking was found to be in remarkable condition considering the lack of existing underlay and the direct fix of the slates, highlighting the quality of the original slates. Hence, there is no secondary layer apart from the slating itself and we trust the quality of the new Welsh slate will replicate the existing quality and last another 100 years.” Due to tight access on the roof, they were also able to widen the lead gutters and set back the lower courses of slates to avoid getting them broken. All the new Penrhyn slates were holed and traditionally fixed with 38mm copper nails as opposed to clipped or other methods. The standard-size slates were able to cope with the wide variation of roof pitches and new rooflights encountered by varying the lap and gauge slightly. In virtually every case, the slate junctions are with lead or copper flashings and as it was appreciated there is some risk of staining, all lead was treated with patination oil. Using new treated timber battens for fixing the new slates proved a great success as direct fixing into the old hardened sarking boarding would have been a major problem and time consuming.  Matthew said the support they had received from Welsh Slate had been “fantastic” and included a site visit to match the type of slate, a letter explaining the need to change from imperial to metric sizing, technical drawings of the arrow-head slates, technical information on the end life of slates and their unsuitability for re-use, on-time deliveries with little if no wastage, and recommending experienced slating contractors. Mundy Roofing were on site for a total of 10 months. Work included the rebuilding of three chimney stacks, involving 30 tonnes of stone and brickwork, and restoration of traditionally-forged wrought ironwork to the pavilion roof crest, all underneath a temporary roof. Russell Mundy said: “This project was extremely challenging due to it being a working embassy but Welsh Slate were excellent with their support in achieving planning consent and the product has received widespread praise from the client.” Matthew said: “Due to the extremely difficult access to this roof, we were conscious to use a slate that will require little maintenance (if any) and satisfy appearance for an extended period of time. Welsh Slate were able to provide technical studies comparing different types of slate and their longevity. This enabled the landlord, Grosvenor Estates, that the new roof should outlast the previous roof and match it entirely with other buildings nearby. Welsh Slate’s evidence on the existing slates being at the end of their useful life, and the lifecycle information of the new slates, helped give the conservation officer comfort that the right approach was being taken for the building.” Keith added: “Essentially, Welsh Slate ensured we got the right slate, quality, consistency and sizes for the varying roof pitches and conditions. There have been no problems with mixing batches or colour variations which can occur. They also met the stringent programme requirements, reducing risks of delay from the main contractor. To our knowledge, there have been no rejects on quality of slates. “The final result is the new slating looks exactly like it was envisaged in 1868, except with the knowledge it is better-fixed and easier to reach for maintenance, with a discreet fall arrest system fitted. The client is extremely happy with the quality of the final works.” Andrea Fox, senior architect with the property management unit of the Department of Foreign Affairs and Trade, said: “The team have provided us with an exceptional and beautiful project that we know will stand the test of time and one we are extremely proud to have commissioned.” “I want to thank the Welsh Slate team for the support they provided during our project and especially in relation to protracted issues relating to the listed building consent approval.” 

Penrhyn Heather Blue slates from Welsh Slate feature on Lincoln’s Inn’s Great Hall. One of London’s most unique buildings is enjoying a new lease of life, thanks to Welsh Slate. The Great Hall and Library Buildings of The Honourable Society of Lincoln’s Inn, an association of students, barristers and judges and one of the four Inns of Court, have over the past two years undergone an extensive programme of external conservation carried out by expert stone masons Capital Stone.  The programme of work includes replacement of the Great Hall’s slate roof covering. Work is still ongoing, with anticipated overall completion in April/May this year, but the work to the Great Hall roof is complete, as is the striking of the temporary roof covering which brings the new roof into view.  The Great Hall and Library Buildings were constructed from 1843 to 1845. The Great Hall roof was originally covered with lead but was recovered in 1868 with slate. From 1871 to 1873 the Library was extended eastwards by three bays. The building is an important example of 19th Century Gothic Revival architecture and has been listed Grade II* since 1951.  After 154 years, the slates on the roof of the Great Hall required replacing to protect the interior, including a striking fresco and beautifully worked oak. The slates were suffering from surface delamination and a large proportion had slipped due to nail rot, requiring tingles to hold them in place. The existing slates were found to originate from both the Ordovician and Cambrian deposits of North Wales – the former predominately on the eastern elevation and the latter on the western. The large Ordovician slates, typically 850mm long and between 350mm and 500mm wide (and laid to a fixed gauge of approximately 350mm which equates to a head lap of approximately 100mm), originated from what is now Welsh Slate’s Ffestiniog quarry, which is currently mothballed, while the other quarries producing these no longer operate. The Cambrian slates from the Llanberis region, as well as Bethesda where Welsh Slate’s main quarry is based, were even larger, at 850mm long and wider than 450mm, laid to the same gauge. Both slate types were fixed to timber battens on open timber rafters, with the underside torched with horsehair and lime plaster. These were replaced for the closest Welsh slate match – Welsh Slate’s County-grade Penrhyn Heather Blues, at 800mm long, widths of between 400mm and 550mm, and a 350mm gauge and 100mm head lap. These are guaranteed for 100 years, with a useful life of 150 years. While the roof is generally simple in form, with two large slopes, its substantial size at circa 800m2 meant the work took considerable time to complete. To allow for more than a dozen dormers the Welsh Slate had to be cut and fitted to size with double copper clout nails. The thickest slates were used on the eaves, diminishing towards the ridge to maintain the original visual finish. They were also holed from the rear to provide a slight countersink to the face. The Great Hall operates by day as a dining hall for members of the Inn, and by night, as a venue for dinners, receptions and weddings for up to 400 people. Set in 11 acres of beautiful grounds in Holborn, Central London, it is the closest Inn to the Royal Courts of Justice. Henry Skinner, Head of Projects and Facilities Management at The Honourable Society of Lincoln’s Inn, said: “The replacement of the roof covering was far from straightforward, despite its externally simplistic construction. During stripping of the existing roof covering, we had to deal with atmospheric lead contamination of a horsehair felt that sat between the original slates and close boarding, requiring controlled measures of removal and disposal.  “Furthermore, the close boarding had warped over time, causing an undulation between roof trusses that needed to be spaced out. This was achieved through the introduction of additional battens and packing timbers to create a level surface onto which the new slate could be laid.” Casey Wickers, trainee quantity surveyor with Capital Stone Renovation, said: “The main work of stripping the existing roof was extremely challenging and labour intensive, to not only remove, wash and handle each slate manually through a tight scaffolding design, but also doing so whilst wearing full RPE due to the lead contamination. “With the two stunning roof facades in full view, the quality of the Welsh slates can be seen by all.

The new Design Museum at Kensington, which opened itsdoors to the public in November 2016 following a move fromits previous residence at Shad Thames, has specified Allgood’sModric ironmongery throughout its interior. Winner of the Guildof Architectural Ironmongery Specification Awards 2016/ 2017Commercial category, the imaginative ironmongery solutionsmeet the architects brief; matching the building’s look and feel.One of the £83million refurbishment’s standout architecturalfeatures was the preservation of the original roof structure, whichwas central to how the new project took shape. The internalfloors of the old building were demolished with a series ofpiles, temporary trusses and beams supporting the internal roofcolumns until the new structure was built and the fit-out stagecould begin.The inherent objective of the project was to create a worldclassmuseum in the heart of London, including permanent andtemporary exhibitions as well as learning spaces – showcasingall elements of design, including fashion, product and graphicdesign.Established in 1989, the museum is known for promoting andexhibiting the best in British design as well as displaying bold andiconic international items.A British design classic, Modric is manufactured in Allgood’s UKfactory where craftsmen pay close to attention to detail, handfinishing every product. Modric has a long-standing reputationof quality built on its ability to consistently perform to the higheststandard. Operating on the unique quadaxial fixing, Modric leverhandles have been independently tested to BS EN 1906 andhave surpassed 1 million cycles, providing just one example whyAllgood has the confidence to offer a 25 year warranty on therange.The interior of the Design Museum features an array ofproductsfrom the Modric range including lever handles, hinges,pull handles,push plates, wc turns, and door signage, as wellas overhead doorclosers, magnetic door holders and unique,concealed doorstops.

The Housing Trust’s first encounter with Metrotile Lightweight Steel Roof Systems was during a refurbishment project at Pendle House, Denton. A home for the elderly, the building needed a new roof but couldn’t accommodate traditional products due to large spans between the trusses and the need for reduced weight on the supporting structure. Metrotile was chosen due to the lightweight and eight-pan profile design. It was after this project that the many benefits of Metrotile Lightweight Steel Roofing became apparent to New Charter Housing Trust and more projects swiftly followed

Furnitubes designed, engineered, manufactured and installed 35 planters and 8 seating units. The planters were supplied in corten steel and aluminium trusses up to 6m high were bolted into the base of the planters for climbing plants to grow up. The seating is from Furnitubes’ new Elements XL range, designed to be sufficiently stable to not require fixing down, with 4 units including bespoke backrests. All products are heavy enough to not be easily moved by the public, but can be readily moved by pallet truck if the spaces in the Lower Mall need to be rearranged in future.

Walker Primary School was opened in 1953 as a one-form entry primary school with seven classes. Over the years, due to its popularity, it has grown and new buildings have been added. Due to the structural design of the building, the roof trusses once exposed meant that the roof changed from one roof to several individual roofs with their own drainage and design issues which meant that each roof had to give its own tapered scheme for each area, which in some cases had to work in tandem with the abutting roof it was next to.

Oakmeadow Primary School is one of the first Passivhaus primary schools in the UK. Designed by Architype architects, the school has a lightweight, super insulated timber frame to achieve Passivhaus airtightness, with a simplified load bearing stud wall, wrapped by an additional layer of insulation created by Larson trusses. A major contribution to the comfort of the occupants is the use of Troldtekt ceiling tiles in both classrooms and the sports hall. The tiles not only reduce reverberation time but also offer high performance acoustic absorption in areas, such as the teaching areas which need to be calm, studious & healthy.

The design briefTo sensitively transform two former workshops buildings into a modern, light and airy family home, in this hidden location.ChallengeTo achieve beautiful design, to sustain health and well-being through superior craftsmanship, quality materials and intelligent use of glass.Solution3m x 2m internal walk on glass floor with glass beams seamlessly appearing out from the walls, elegantly modern design introducing light and the illusion of space. 19mm thick monolithic glass balustrade sections connect each room achieving a spacious, sharp and minimal look. The multi-panel skylight engineered to fit existing timber trusses creates a sense of large expanse and allows the flow of daylight to pass down to the lower levels, lightening up the beautiful design within.Whether you’re at planning or construction stage why not see how we could help you add natural light and space to your home project; you can call us on 01223 792244 or pop us an email via info@nextgenrooflights.co.uk outlining what help you need.

DWB Hull, a licensed MiTek roof truss and Posi-Joist manufacturer, recently supplied specially designed Posi-Rafters to form the roof for a large domestic extension. Bespoke end details were incorporated into the Posi-Rafter design to make installation straightforward and to provide solid bearings on to the steel beams and walls. The build had two steel ridge purlins and a central steel at ceiling level, forming a large vaulted ceiling internally. Posi-Rafters were the ideal choice, with plated end blocks sitting directly on to the steel beams with no need for hangers.

Architects: Woods BagotLocation: Wiltshire, UKPhotography: Will PryceMaterial: NATURSOFFIT-W CladdingFinish: RustikThe project by the Woods Bagot architecture studio for the library at St. Mary’s Calne School re-centres the space as the hub of academic and social activity. Completed in 2020 and located in the British county of Wiltshire, the project maintains the school’s traditional aesthetic, all while incorporating a central garden with apple trees.The library’s faceted ceiling is a central part of the design, which evokes spreading tree branches. All of the wood panels are held up by an iron truss structure connected to large pillars, simulating the vertical nature of trunks. The properties of Parklex Prodema’s false ceiling allow continuity for the wood from the interior to the exterior, making it visible through the clerestory windows.The triangular panels that make up the complex faceted geometry are resistant, long-lasting, sustainable, and maintenance-free. They were custom manufactured for this project, including perforations for acoustic purposes, allowing sound to pass through the panel to be absorbed by the insulation behind it.The natural Okume wood panel selected by the architects provides a warm, welcoming atmosphere, creating a point of inspiration for learning. Combined with the garden landscape around it, the continuous ceiling magnifies the building’s appeal and integrates it into his surroundings.

Estudio B76 designed its new headquarters in an industrial warehouse built in the 50s. They kept and revealed reinforced concrete trusses and the perimetral walls made of bricks. The design focuses on using glass and steel to maintain the industrial atmosphere.Thanks to active and passive sustainable measures, such as photovoltaic panels, aerothermal energy, and efficient shading solutions, the project achieves high sustainability.From Bandalux, we proposed a combination of systems suitable for both the working and residential parts of this mixed project:, but Veranda Plus is particularly convenient as it completes without denaturing the former structure of the building.

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.