Air Barrier vs. Vapor Retarder
Welcome to Episode 4 of The Building Science FAQ series.
The Building Science FAQ video series explores some of the technical questions that crop up when specifying a low-slope roof.
In this episode, Jennifer Keegan, director of building and roof science, GAF, and Jim Kirby, GAF building and roofing science architect, address a common area of confusion: “What is the difference between an air barrier and a vapor retarder?” While an air barrier stops air leakage, a vapor retarder reduces moisture diffusion to reduce the risk of condensation forming in the roof assembly. But can an air barrier be a vapor retarder?

Episode 1: How Strong is a Thermoplastic Weld? 
Episode 2: How Chemical Resistant are TPO and PVC?
Episode 3: What is a roof coating?
The post Building Science FAQ — Ep. 4 appeared first on GAF Blog.

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