Why a Liquid-Applied Membrane May Be Your Next Roof

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Webinar On-Demand
Sponsored by GAF
Presented by Jennifer Keegan, AAIA, and James Kirby, AIA

Learning Objectives:

  1. Discuss the building code requirements for new construction, reroofing and re-covers for liquid-applied membranes and the related definitions within the codes.
  2. Classify material types and discuss the characteristics of common materials used as liquid-applied membranes and when to use them.
  3. Describe the testing requirements and assembly components (including substrates) for liquid-applied membranes when used as part of an approved roof covering.
  4. Discuss the specific steps for proper application of liquid-applied membranes and recognize the importance of proper substrate preparation.


This test is no longer available for credit

Coatings aren’t just for maintenance. Liquid-applied membranes (LAM) are being used more and more as the weatherproofing layer of a roof system for new construction, reroofing and re-covers. While a LAM can use the same materials as a traditional roof coating, they are much different. The building code (finally!) separates liquid-applied coverings and roof coatings; the specifics will be provided. The types of materials used for LAMs and their material characteristics—focusing on polymer-based products—will be examined. Roof system design, approval listings, as well as proper application methods will also be discussed. This presentation will help anyone involved in the design and specification, installation, or ownership of LAM-based roof systems.

Liquid Applied


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


James R. Kirby, AIA, is a GAF Building & 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. Jim presents building and roofing science information to architects, consultants and building owners, and he writes articles and blogs for building owners, facility managers and the roofing industry at-large. He is a member of AIA, ASTM, ICC, IIBEC, NRCA and WSRCA.


GAF GAF is North America’s largest and most advanced roofing and waterproofing manufacturer. With customer-driven innovation, the company has protected homes, businesses, families and communities for over 130 years. With plants strategically located across the country, more homes and businesses in the U.S. are protected by a GAF roof than any other product. GAF protects what matters most.


Originally published in May 2021