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VAPOR PERMEABILITY PROVIDES NO PERFORMANCE ... - …
1 VAPOR PERMEABILITY PROVIDES NO PERFORMANCE BENEFIT FOR ROOFING UNDERLAYMENTS IN VENTILATED ATTICST esting shows breathable underlayment PROVIDES little or no moisture transfer value in asphalt roofi ng Joseph Lstiburek, , P. Eng., ASHRAE Fellow, Building Science CorporationDr. Achilles Karagiozis, Director of Building Science, Owens CorningPaul Gassman, P. Eng., Product Engineer, Owens Corning October 20112 AbstractMany manufacturers have introduced synthetic underlayments in the roofi ng market to serve as secondary water shedding barriers under roof shingles. Traditional organic asphalt felt has served this purpose for years, but durability has diminished over time and the product is inferior to recently available synthetic products made with layers of composite polyolefi n. While traditional felts are permeable, allowing moisture VAPOR transfer over time, newer synthetic materials are typically nonpermeable, allowing very little moisture transport.
2 Abstract Many manufacturers have introduced synthetic underlayments in the roofi ng market to serve as secondary water shedding barriers under roof shingles.
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