The new test method from ASTM uses a laboratory technique to determine air leakage in low-sloped membrane roof assemblies and accounts for the wind fatigue expected during the life span of a roof by simulating negative air pressure differences.
The new standard (soon to be published as D8052/D0852M, Test Method for Quantification of Air Leakage in Low Sloped Membrane Roof Assemblies) was developed by ASTM’s committee on roofing and waterproofing (D08).
“It is critical that each assembly of the building envelope be investigated for air leakage performance with appropriate standards,” says ASTM member Sudhakar Molleti. "What cannot be captured in the material and full envelop air leakage testing i.e. the structural strength and continuity of the air barrier assembly can be quantified in the assembly testing. To achieve energy efficiency of building and to adapt for climate change, comprehensive data of material, assembly and full envelope air leakage testing are needed. By quantifying air leakage in roof assemblies, this new standard can serve as a platform for supporting code compliance and for constructing energy efficient and sustainable roof assemblies.”