How Multi-ply Membrane Systems Give Your Roof Extra Protection

Bituminous systems proven to last
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Webinar On-Demand
Sponsored by Johns Manville
Presented by Joel Asrael

Learning Objectives:

  1. Review the history of modified bituminous roofing membranes, including how and why they came to be, focusing on market conditions and raw material availability and performance.
  2. Explain the four SBS system application methods and two APP system application methods and how a facilities location, project timeframe and site conditions could impact which method best fits your project.
  3. Gain an understanding of the physical performance of these roofing membranes, what drives that performance and the various choices available that differentiate the available products in the roofing system family.
  4. Match project design criteria, membrane options, application options and long-term performance to provide multiple solution offerings to your building owners and communicate the differences between these good, better or best type offerings.


This test is no longer available for credit

The bituminous roof system has a long history and has improved through the years. A variety of reinforcements, types of sheets and different surfacings make these systems robust, versatile and proven. These membranes can be installed using a wide variety of methods and can be finished off with flashings around the more intricate parts on the roof. Learn more about how these systems can protect your roof.

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Joel Asrael

Joel Asrael has a MS in mechanical engineering from Arizona State University and brings with him extensive experience with energy efficiency for commercial buildings. He is a national member of AEE, ASHRAE, CSI and RCI.

Johns Manville logo. Johns Manville, a Berkshire Hathaway company, is a leading manufacturer of premium commercial roofing products from bituminous to single-ply and liquid applied, and everything in-between. JM has depth and expertise in the building sciences with top professionals available to help with your building projects. For more information, visit


Originally published in September 2018