Vapor Permeability Provides No Performance Benefit for Roofing Underlayments in Ventilated Attics

Dr. Joseph Lstiburek, Ph.D., P. Eng., ASHRAE Fellow, Building Science Corporation Dr. Achilles Karagiozis,Director of Building Science,Owens Corning Paul Gassman, P. Eng., Product Engineer, Owens Corning Introduction The roofing market has seen an onslaught of new synthetic underlayment products in the past 10 years. These products bring many advantages to the installer: increased speed of …

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