28 May '13, 11pm

Roofing material over sheathing which can't dry to the inside? #green

Underside of roof sheathing has polyurethane foam on it, so if it were to get wet, there would be no drying to the inside. Would it be problematic installing asphalt shingles on this roof? Thanks!

Full article: http://www.greenbuildingadvisor.com/community/forum/gener...

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greenbuildingadvisor.com 28 May '13, 5am

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greenbuildingadvisor.com 22 May '13, 11am

Erik, In general terms, we know about vapor transport in walls due to the work of researchers who have used three avenues ...