Air Leakage Degrades the Thermal Performance of Walls

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No surprises here — but testing by the Building Science Corporation begins to quantify the problem

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[](http://www.greenbuildingadvisor.com/blogs/dept/musings/air-leakage-degrades-thermal-performance-walls)

For the past five years, researchers at the Building Science Corporation (BSC) in Massachusetts have been testing the thermal performance of a variety of wall assemblies as part of an ambitious project to develop a new metric to replace R-valueMeasure of resistance to heat flow; the higher the R-value, the lower the heat loss. The inverse of U-factor. . (I last reported on the project in my August 2011 article, [A Bold Attempt to Slay R-Value](http://www.greenbuildingadvisor.com/blogs/dept/musings/bold-attempt-slay-r-value).)

BSC researchers recently released information on the multi-year project:

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URL: http://www.greenbuildingadvisor.com/blogs/dept/musings/air-leakage-degrades-thermal-performance-walls