50 STRUCTURAL ELEMENTS
appealing, as it requires fewer compo- nents and therefore introduces less complexity on-site. I-joists also use less material than solid
timber joists to perform the same function, and are a lower embodied energy product when compared to other building materials. The use of I-joists within panellised roof systems has seen this market innovate and develop rapidly in the UK. Long length joists enable the roof panels to run verti- cally (as a rafter) or horizontally (as a
purlin), in conjunction with glulam (glue- laminated timber) or LVL supports. However, the inherent product benefits have seen I-joist usage grow not only for roofs and walls but increasingly in floor- ing systems, making them a market leading solution based on performance, cost and ease of installation. This increase in usage has led to innovations within the industry, with insulated I-joists being a recent introduc- tion to the marketplace. They offer a much needed benefit where consistent
quality, speed and efficiency of manufac- ture are critical to the supply process. It’s expected, with reduced energy costs being high on the list of purchasing influences for the house buyer and low carbon homes being high on the political agenda, that the I-joist will continue to be a go-to solution, with more product innovations expected in the near future.
Angus Macfarlane is general manager of James Jones & Sons’ Timber Systems Division
Protect Membranes chosen for first multi-storey Passivhaus building in Scotland
installed by design and build contractors Stewart & Shields in Scotland’s first multi-storey Passivhaus building, providing social housing apartments for Shettleston Housing Association. Used as part of a conversion project at Old Carntyne Church in Glasgow, the construction involved mixing traditional construction with new, with the church structure being restored alongside a new build extension which was built offsite. Renamed Cunningham House, the development is one of Scotland’s most energy-efficient affording housing
P
Protect BarriAir and VC Foil Ultra membranes were used to meet strict levels of airtightness levels and vapour control.
rotect BarriAir and VC Foil Ultra, the air and vapour control layers from Protect Membranes, have been specified and
developments and the city’s largest Passivhaus development to date, winning the Best Affordable Housing Development (Urban) category at the 2019 Inside Housing Development Awards. Working with Page Park Architects for the
main project design and John Gilbert Architects for the Passivhaus element, Stewart & Shields delivered 19 apartments. 14 of these were conventionally built flats within the existing church structure, with the remaining five units being constructed within the new build timber frame five-storey extension which was built to full Passivhaus Standard and is independently certified by the Passive House Institute. Derek McIlreavy, Business Development and
Design Manager at Stewart & Shields Ltd commented, “The specification of materials for this development was based on the need for a high quality end result to meet strict Passivhaus criteria. We knew that Protect BarriAir and VC Foil Ultra would be up to the job in terms of airtightness to help us achieve the critical results needed to be independently certified. We had to beat 0.6 ach-1
@50Pa for airtightness
and our tests showed a result of 0.33 which overall gave an added value solution to our
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The Cunningham House development won the Best Affordable Housing Development (Urban) category at the 2019 Inside Housing Development Awards.
client that helps to future proof these homes going forward.” Protect’s BarriAir and VC Foil Ultra
membranes form part of a comprehensive range of wall, ceiling and floor construction membranes alongside roofing underlays and accessories which are ideal for traditional and offsite construction, to help ensure the whole building envelope and internal structure can be controlled in terms of moisture management, condensation control and thermal resistance.
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