A new ASTM International test method aims to prevent air leakage in and around roofs, helping improve energy efficiency, reduce moisture problems, and prevent pollutants from entering the building.
“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.”
Molleti, a research officer with over 10 years of roof assembly testing at the National Research Council of Canada, notes that roofing membranes are air impermeable but can be compromised by factors such as lack of continuity of the membrane seams, improper detailing around rooftop preparations, improper selection of flashing materials, and improper connection of roof membranes to the exterior wall barrier.
Specifically, this new test method is 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).
To purchase standards, visit www.astm.org and search by the standard designation, or contact ASTM Customer Relations (tel +1.877.909.ASTM; email@example.com). ASTM welcomes participation in the development of its standards. Become a member at www.astm.org/JOIN.
Helping our world work better
Over 12,000 ASTM standards operate globally. Defined and set by us, they improve the lives of millions every day. Combined with our innovative business services, they enhance performance and help everyone have confidence in the things they buy and use – from the toy in a child’s hand to the aircraft overhead.
Working across borders, disciplines, and industries we harness the expertise of over 30,000 members to create consensus and improve performance in manufacturing and materials, products and processes, systems and services. Understanding commercial needs and consumer priorities, we touch every part of everyday life: helping our world work better.
For more news in this sector, visit www.astm.org/sn-construction.See the latest posts on our homepage