Retrofit Single-Ply Roof Systems over Metal Panel Roofs

What are current market practices, best practices and industry concerns for wind resistance?
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Webinar On-Demand
Sponsored by GAF
Presented by James R. Kirby and Thomas J. Taylor

Learning Objectives:

  1. Review and classify current industry practices for retrofit single-ply roofs.
  2. Define the metal roofing industry’s concerns when recovering with single-ply membranes.
  3. Identify the wind uplift concerns of the existing metal roof when changing the uplift load path.
  4. Define fastener spacing guidelines based on calculated loads and pullout values for a typical reroofing scenario.


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Roofs on metal buildings are frequently re-covered with single-ply roof systems. But what’s the right way to install them? This webinar will discuss current installation practices as well as concerns raised by the roofing industry. For example, is it appropriate to install fasteners into the metal panels? Are there deflection concerns for the existing structure because the drainage pattern is changed? Does the retrofit single-ply installation specification for fastener type, location and spacing take into account wind uplift? Not fully understanding these issues and appropriate solutions can put your building at risk. You will take away valuable information to mitigate risk and set up your next retrofit single-ply project for success!

Retrofit Single

Photo courtesy of GAF


James R. Kirby, AIA, is a GAF building and roofing science architect. Jim has a Masters of Architecture—Structures Option, and he is a licensed architect. He has over 25 years of experience in the roofing industry covering low-slope, steep-slope, metal, SPF, vegetative and rooftop photovoltaics. He understands the effects of heat, air and moisture on a roof system. Jim presents building and roofing science information to architects, consultants and building owners, and he writes articles and blogs for building owners and facility managers, and the roofing industry at-large. He is also a member of AIA, ASTM, ICC, MRCA, NRCA and IIBEC.


Thomas J. Taylor is Building & Roofing Science Advisor for GAF. This position is focused on the relationships between individual roofing materials and the overall roof system and building envelope performance. Tom is a frequent presenter at both national and regional industry meetings. He has over 20 years’ experience in the building products industry, all working for manufacturing organizations in a variety of new product development roles. He received his PhD in chemistry and holds approximately 35 patents.


GAF | Siplast The Building and Roofing Science team offers regional expert building enclosure collaboration through design, specification, and educational support for customers of GAF and Siplast, both Standard Industries companies. GAF is North America’s largest roofing manufacturer with more homes and businesses in the U.S. protected by a GAF roof than any other product. Siplast, a leader in building enclosure systems, offers a portfolio of advanced, high-performance SBS-modified bitumen, PMMA liquid-applied, PVC KEE, lightweight insulating concrete, wall air & water barrier systems, and amenity/vegetated systems.


Originally published in October 2019