Wraptite-SA, the only self-adhering vapour permeable air barrier certified by the BBA, was applied externally to the timber frame 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. The use of Wraptite-SA makes a significant contribution to a building’s thermal performance by preventing lateral air movement. It also provides high vapour permeability, which allows any water vapour to escape the wall construction efficiently thereby avoiding any interstitial condensation problems.

A. Proctor Group carried out on site air tests of trial units prior to commencement of the main project. Initial air tightness results after installation achieved a rating of 0.72, well within the target level of less than 1.

Product Information