Performance Analysis of Aged TPO Membranes

A Real Life Field Study
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Live webinar airing on July 14, 2020 at 2:00 PM EDT
Sponsored by GAF
Presented by Helene Hardy Pierce and Thomas Taylor

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

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.


Tom Taylor is the Building & Roofing Science Advisor for GAF. This position is focused on the technical attributes and analysis of the various elements within a commercial roof assembly. He is experienced at evaluating the relationships between individual roofing materials and the overall roof system and building envelope performance. Tom was previously the Executive Director, Building & Roofing Science. He is a frequent presenter at both national and regional industry meetings. Tom 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 More homes and businesses in the U.S. are protected by a GAF roof than by any other product. We are the leading roofing manufacturer in North America, with plants strategically located across the U.S. GAF is part of the largest roofing and waterproofing business in the world.