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Does your Waterproofing Membrane seal around nails?

This is a follow up to the long term durability test I post about last week.  We are talking today about how well a membrane seals around nail holes.  Specifically, an ASTM test that manufacturers subject their products to in order to show they meet a standard of “waterproofing”.  As a part of the Weather Resistive Barrier (WRB) testing the team ran their own version of this ASTM – D 1970 test that was created for roofing membranes that guard against ice dams and the leaks that occur when ice is forced under shingles then melts.  Well, it turns out this test is pretty tough to meet.  I heard from the UT team that in speaking with the test labs with the official ASTM results they apparently only publish the “passing” tests and not the failed ones.

So, which is the one that actually passes in the video?  Only Tremco’s ExoAir 220 actually passed the test run by the UT Durability lab.  This Fluid Applied (thick mil) WRB was the only one that successfully sealed around the backed out nails and kept water at bay for the required period of time.  This is only one test, but that’s a pretty big win for the Tremco WRB.

I’m working on a Journal of Light Construction article that will be published next month on this topic of WRB’s and the good/better/best methods for using them on your project.  Stay tuned for that, but in the meantime if you aren’t a JLC Subscriber you can use this link for a fantastic $9.99 new subscriber rate.


Matt Risinger

Risinger Homes in Austin, TX

Visit my Blog at www.MattRisinger.com

Risinger Homes is a custom builder and whole house remodeling contractor that specializes in Architect driven and fine craftsmanship work. We utilize an in-house carpentry staff and the latest building science research to build dramatically more efficient, healthy and durable homes.

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