Wraptite-SA airtight membrane has once again proven its capability to deliver high performance airtightness, this time, at an altitude of 1400m on a ski chalet in the Rhône-Alpes region of France.
When former project engineers, Mark and Michelle Godden purchased the chalet in Saint-Nicolas-la-Chapelle, A. Proctor Group was approached on the suitability of Wraptite-SA to perform at such a challenging altitude.
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.
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For any building to have an energy efficient, healthy, moisture free building envelope there is a clear need to manage the balance of Heat, Air and Moisture movement (HAMM) throughout the building’s life cycle from design, construction, completion and use.