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GAF Building Science FAQ Video Series

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This new video series from GAF will explore some of the technical questions that crop up when specifying a low-slope roof.


How Strong is a Thermoplastic Weld?

In this episode, Tom Taylor PhD, Executive Director Research and Development for GAF, and James Willits, GAF Building and Roofing Science Specialist, head to the R&D lab to find out exactly how strong a thermoplastic weld is, and how that affects the roof system.


How Chemical Resistant are TPO and PVC?

In this episode, Tom Taylor PhD, Executive Director, Research and Development for GAF, and James Willits, GAF Building and Roofing Science Specialist, discuss the chemical resistance properties of TPO and PVC. They also present some valuable tips for avoiding or minimizing the damage chemicals can do to your roof.


What is a roof coating?

In this episode, Jennifer Keegan, Director of Building and Roof Science, GAF, and Jim Kirby, Building and Roofing Science Architect, GAF, address a deceptively straightforward question: “What is a roof coating?” Answering that question requires an understanding of the many differences in use, benefits and application scenarios between roof coatings and liquid-applied roof membranes.


Air Barrier vs. Vapor Retarder

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?


What is the difference between a metal roof and a metal deck?

 In this episode, James R. Kirby, AIA, GAF Building and Roofing Science Architect and James Willits, GAF Building and Roofing Science Specialist, discuss the structural and end-use differences between metal decks and metal panels. They also visit Senior Research Associate Erica Sherman in the R&D lab to examine the fundamental differences in deck and panel strength, thickness, and geometry.

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