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What to Know When Working With TPO

Thursday, April 26, 2012

By Kat Harrold


Photo - Jorg Breuning

Working with green roofs for quite some time we have come to appreciate the compatibility of the TPO waterproofing with the Electric Field Vector Mapping System (EFVM).  Something important to consider however is the relation between the insulation and the waterproofing in determining the type of EFVM system.  

A project using waterproofing adhered to the insulation requires a metal mesh EFVM system in between the waterproofing and insulation whereas the system that has the waterproofing mechanically fastened to the insulation requires only a wire perimeter on top of the waterproofing.   Aside from being more labor intensive to install and modify, some roofing manufacturers would not warrantee their TPO with the metal grid between their waterproofing and insulation.  Proceed with caution when roofers site incompatibilities with their TPO and an EFVM system.  You may want to consider another manufacturer. 

Brian G commented on 02-May-2012 12:38 PM
Membrane manufacturers may not warrant a mechanically-attached membrane in the first place when used as a waterproofing membrane under overburden (such as green roof assembly). The fasteners or plates could damage the membrane, depending on the compressive
strength of underlying components.
Vapor Cigarettes commented on 09-May-2012 10:59 AM
I was planning to have a green roof on my own and I have no idea about it. Thanks to this post, I've gained an idea about the importance of a compatible TPO waterproofing with the EFVM. Btw, do you know any good links to some reliable roofing manufacturers?
Houston Roofing Contractors commented on 02-Jun-2012 10:36 AM
Great article. TPO roofing systems have come to be the single ply of choice over the years.

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