The lower walls of the chalet are constructed as an insulated concrete form, with the upper sections made from timber posts with insulation in between. The timber walls were covered with OSB panels, with Wraptite- SA, self-adhering vapour permeable air barrier being applied to overlap onto the ICF wall to make it airtight, and aged wood placed on the exterior to complete the finish.
The use of Wraptite-SA makes a significant contribution to a building’s thermal performance by preventing lateral air movement. Wraptite-SA’s high vapour permeability allows any water vapour to escape the wall construction efficiently thereby avoiding any interstitial condensation problems. This ensures good indoor air quality and reduces the likelihood of mould, mildew, and timber distortion.
Wraptite-SA, the only self-adhering vapour permeable air barrier certified by the BBA, was applied externally to the OSB panels in continuous pieces. Traditional use of internal air barriers can be more complex and costly to install, due to the need to accommodate building services such as electrical, lighting, heating and drainage systems.
Saint-Nicolas-la-Chapelle is a historic mountain village near Megeve, and located opposite the famous Mont Blanc, and at the foot of Mount Charvin.