Performance Analysis of Aged TPO Membranes

A Real Life Field Study
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Webinar On-Demand
Sponsored by GAF
Presented by Helene Hardy Pierce and Jennifer Keegan

Learning Objectives:

  1. Describe the long-term aging effects of field-installed TPO roof membranes.
  2. Evaluate the performance and ability to repair field-aged TPO roof membranes.
  3. Review in-service performance of TPO roof membranes in various climates throughout the U.S.
  4. Assess tools to determine when it is appropriate to specify TPO roof membranes.


1 AIA LU/Elective
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A study of the long-term performance of field-aged TPO roof membranes installed throughout the United States will evaluate thickness, flexibility, inspection under 7X magnification, and aged seam and repair weld adhesion. The intent of this study is to evaluate 1) field-aged TPO roof membrane performance and 2) the ability to repair field-aged TPO roof membranes. Assessment tools will be reviewed to determine when it is appropriate to specify TPO roof membranes.

Performance Analysis

Photo courtesy of GAF


Helene Hardy Pierce has spent over 37 years in the roofing industry and has been very active in many of the industry’s organizations. She received the ASTM Award of Merit and title of Fellow from ASTM Committee D08 on Roofing, Waterproofing and Bituminous Materials in 1998, the James Q. McCawley award from the Midwest Roofing Contractors Association in 1999 for contributions to the roofing industry, and the title of Fellow of the Institute from the Roof Consultants Institute in 2005. She served on the Board of Directors for ASTM from 1999-2002 and then on ASTM’s Executive Board as Chairman of the Finance and Audit Committee in 2003.


Jennifer Keegan, AIA, is the Director of Building & Roofing Science for GAF, focusing on overall roof system design and performance. She has over 20 years of experience as a building enclosure consultant specializing in assessment, design and remediation of building enclosure systems. Jennifer provides technical leadership within the industry as the Chair of the ASTM D08.22 Roofing and Waterproofing Subcommittee; and as an advocate for women within the industry as the educational chair for National Women in Roofing and a board member of Women in Construction.


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 July 2020