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Old 10-19-2010, 10:14 AM   #1
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Attic insulation

Do I need blown-in fiberglass on the attic floor if I foam the roof deck?

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Old 10-21-2010, 10:17 PM   #2
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Attic insulation

No. http://www.buildingscience.com/docum...r-all-climates


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Old 10-22-2010, 12:44 AM   #3
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Attic insulation

thats what i am doing with mine too. spray foam the deck. no venting!
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Old 10-23-2010, 02:27 AM   #4
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Attic insulation

I understand that cc spray foam is getting more popular against roof sheathing, but I always worry about a tiny little leak somewhere. If the foam is several inches thick, I don't see your sheathing drying, but I do see it rotting. Maybe the roofing material is moisture permeable enough (depends on what you use), but I'd at least make sure my sheathing could breathe to the outside if I foamed it inside. If you do not spray the roof, then I'd suggest you look at blowing in cellulose instead of fiberglass.
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