25 May '15, 12pm

Does This Roof Need a Vapor Retarder?

Does This Roof Need a Vapor Retarder?

[Editor's note: Joe Lstiburek and Armin Rudd have measured the moisture content of roof sheathing behind open-cell spray foam installed without an interior vapor retarder in Climate Zone 5 and found that in some cases the moisture content is high enough to be worrisome. GBA readers should make their own judgments on the need for vapor retarder paint in this location. Joe Lstiburek advises builders to include vapor-retarder paint on gypsum wallboard under roof assemblies insulated with open-cell spray foam in Climates Zones 5, 6, 7, and 8. When Peter Yost was asked a follow-up question about his recommendations, he wrote, "I'm sticking to my guns after giving this more thought and doing a bunch of WUFI runs. I know that WUFI is only part of understanding the situation and I am also not that sure that if the three of us were discussing this particular assembly we would disag...

Full article: http://www.greenbuildingadvisor.com/blogs/dept/qa-spotlig...

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