Go with the Flow: Tapered Insulation Fundamentals

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Webinar On-Demand
Sponsored by GAF
Presented by Veronika Chwieroth and Jennifer Keegan, AAIA

Learning Objectives:

  1. Assess the purpose of a tapered insulation system and how it works.
  2. Develop a basic comprehension of tapered polyisocyanurate insulation panels and how they affect roof performance: design options, crickets.
  3. Identify design intent and what key questions to answer when designing a tapered insulation design.
  4. Recognize how IECC codes affect tapered insulation systems.



A majority of buildings in commercial roofing are designed to have minimal roof slopes or roofs that are even built flat. This introduces a myriad of service life issues if bulk water is not directed off of the roof. Tapered insulation systems add positive drainage to manage water flow, prevent water infiltration, as well as insulate buildings at the roof level.


Photo courtesy of GAF


Veronika Chwieroth, is a Senior Sales Design Specialist for GAF. Representing the Northeast and Mid-Atlantic, she provides expert regional insight for tapered insulation systems. Veronika is a supporting member of National Women in Roofing and holds a Product Design degree from Parsons School of Design.


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 building forensics, 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.


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 September 2022