b'PROJECT PROFILEand roofing, had to be sized to fit in theThe panels included a combination ofrainwater during construction, so care narrow alleyway for hoisting up to the roof.blown cavity insulation and rigid exte- was taken to manage moisture loads Prefabricated cassette panels for the floor,rior insulation in order to achieve thethrough a combination of panel design and walls and roof were sized to fit in the three- demanding thermal insulation require- limiting standing water on the floor panels metre space between the buildings. ments of Passive House, Wilkinsonduring construction.continues. The combined cavity and THE BUILDING ENVELOPE exterior insulation thickness exceededThe childcare buildings were designed Designing the building envelope for the600 mm for the roof panels (R-100+).with relatively simple geometry, as well as GCCC buildings was more complex thanThe buildings also incorporated fiber- limited/consolidated mechanical and elec-usual because of the Passive House/LEEDglass doors and windows for furthertrical penetrations wherever possible. This requirements and the unusual project site,reduction of heat loss through theapproach limited thermal bridging related says Michael Wilkinson, Project Lead frombuilding enclosure. heat losses as well as minimizing the RDH Building Sciences. The enclosurenumber of details that required sealing.design involved prefabricated panels withAs the buildings were constructed over the sealed interior OSB sheathing as the primarysteel structure elevated above the parkadeThe GCCC buildings are simple, efficient air barrier. Due to Passive House airtight- decks, detailing the floor panels aroundtimber-framed structures that meet the ness requirements, the exterior self-adheredthe structural connections was often chal- requirements of Passive House/LEED stan-membrane was also detailed to airtight aslenging. Additionally, it was anticipateddards and the City of Vancouvers expecta-a redundancy. that the panels would be exposed totions, states Wood. The project team 12 BCBEC ELEMENTSA BCBEC PUBLICATION'