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Old 03-15-2012, 03:27 PM   #1
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Insulation / roofing problem


I recently was part of a whole house renovation and the homeowner had closed cell foam insulation done in the entire house. The roofing used on this project is a basic GAF Timberline series with normal underlayment. About a year has gone by and the roof in three different places is starting to bubble, all on the same slope and all apx. the same distance from the ridge. I have never seen this condition before and there are no nails causing this. Has anyone ever heard of or seen this condtion. I read somewhere online that sometimes closed cell if done to thickly can actually retain heat for long periods of time and possibly cause this???? Any help would be appreciated.

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Old 03-16-2012, 09:28 PM   #2
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Insulation / roofing problem


Solar driven moisture is what it sounds like, and it could go back to normal- over time/seasons, Fig.13, 14: http://www.buildingscience.com/docum...on?full_view=1

Foam against OSB is usually risky as it needs an air gap on one side (at least) to dry out because the product is hygroscopic; http://www.buildingscience.com/docum...d%20in%20walls

The impermeable roofing shingles stop any moisture in the OSB from drying on one side, foam stops it on the other- “Practical Recommendations”, pp.5, second and third bullet: http://www.earthane.com/ctu32e.pdf

Or it could be edge swelling, if it is that, may be irreversible: http://www.ewpa.com/Archive/2006/aug/Paper_266.pdf

And it could be none of the above---- did you check in the attic for a moisture source?

Gary

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