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"truss"

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Loft ladders solutions for a truss roof

Loft ladders solutions for a truss roof

Premier Loft Ladders Ltd

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.
Curved Trussed Rafter Roof Over Supermarket

Curved Trussed Rafter Roof Over Supermarket

MiTek Industries Ltd

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
Northstone lays the foundations for large North East Development with H+H Blocks

Northstone lays the foundations for large North East Development with H+H Blocks

H+H UK Ltd

H+H Foundation Blocks are being used for the groundworks with methods including pile foundations, driven pile foundations and strip foundations being utilised. The ground floors will be constructed using concrete slabs, external walls will be built with H+H 100mm Standard Grade Celcon Blocks and the homes are to be topped off with truss roofs. Each property will be finished with external brick work.
New Charter Housing, Cheshire

New Charter Housing, Cheshire

Metrotile UK Ltd

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
Seating and bespoke planters - Westgate Mall, Oxford

Seating and bespoke planters - Westgate Mall, Oxford

Furnitubes International Ltd

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.
School Roof Receives Much Needed Fire Protection and Waterproofing

School Roof Receives Much Needed Fire Protection and Waterproofing

IKO PLC

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.
Posi-Rafters - the ideal solution

Posi-Rafters - the ideal solution

MiTek Industries Ltd

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.
Oakmeadow School

Oakmeadow School

Troldtekt A/S

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.
Accoya wood at Breakers Beach restaurant, The Netherlands

Accoya wood at Breakers Beach restaurant, The Netherlands

Accoya

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.
Manchester Metrolink, Manchester, UK

Manchester Metrolink, Manchester, UK

Fabric Architecture Solutions Ltd

Tensile Canopy:Just a stone’s throw from the Etihad Stadium, home to Man City Football Club, Manchester Metrolink station is following the growing trend for using fabric as a building medium to provide creative lighting and shelter for passengers.The Challenge:Shelter and lighting were the main criteria for designing the lozenge-shaped tensile fabric platform canopies. DEK Architects’ vision for 2 ‘flying saucer’ like structures illuminating the platform, needed to comply with rail safety regulations as well as provide ambient and practical lighting for passengers. The light source had to be contained within the fabric structures to prevent night glare, which could distract train drivers. Internal drainage to catch water run-off, was also crucial to maintaining the visual impact of the platform shelter.The Solution:Fabric Architecture designed and engineered the 1000m2 structure in house, allowing crucial loading information for the foundations to be given to the main contractor at a very early stage of the project. By constructing a series of bow trusses, the fabric was applied to the upper and lower chords, terminating in a ring beam that doubled up as a structural gutter. This allowed internal rainwater drainage and avoided unsightly drainpipes.
Welsh Slate helps Attleys catch a curve ball at Coal Drops Yard

Welsh Slate helps Attleys catch a curve ball at Coal Drops Yard

Welsh Slate

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.

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