Our first visit to site this week made for positive viewing with some plots a hive of activity and, with a number of timber frames in place, the shape of the Expo community is vastly becoming reality. Those who managed to get out of the ground before or between the snow have managed to make some good progress.
There was still no concrete flowing on 11 but the large scale timber formwork for our rather tricky concrete footing and retaining wall detail was in place and awaiting better weather.
The last week has seen final discussions on timber frame prior to going into manufacture in Elgin by RTC and arrived on site at the end of March, although it looks as though the delays caused by bad weather may stretch that slightly. We are using RTCs Passivwall system that was specially created for building to PassivHaus standard and ours will be the 3rd scheme to use the system after Bethania in Dunoon and Midmar in Aberdeenshire. We’ve been working closely with Buro Happold and Alastair Rennie and his team at RTC to get the most out of the timber frame system and resolve some challenging structural issues like the corner cantilevers which will help form the distinctive architecture of the units. Our external walls will achieve a U-Value of 0.1 W/m2K and help us achieve an air tightness 10 times better than current building regs.
Finalising the timber frame manufacturing drawings have also allowed us to do a final check on window sizes and specifications and push through the Window order with Internorm in Rosyth, who are importing the window and door units from Internorm’s manufacturing base in Austria. With external windows and doors so critical to the PassivHaus strategy, it was important for us to use a tried and tested product that was also PassivHaus certified. The windows and external door units achieve a 0.71W/m2K U value. It is unfortunate that we couldn’t source anything with such a good U-Value or indeed PassivHaus certification any closer to home although we have talked with Internorm in Scotland about their plans to hopefully start manufacturing the same system using Scottish materials and Scottish Labour in the future. Windows could be 8-10 weeks so a bit of a risk to programme but isn’t that always the way on Grand Designs?!
The first and most obvious progress arriving on site is on plot 5 by JM being constructed by Robertson Highland where timber roof panels are being put in place and also at plot 4.2 by Andrew Black and William Gray where the timber frame and distinctive curved roof is being completed.
From Passivhaus blog
HLM Architects are building some of the first UK homes to meet the German Passivhaus standard for Scotland’s Housing Expo this summer. Here the firm will update on progress.
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