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<blockquote data-quote="muzzyhunter" data-source="post: 376575" data-attributes="member: 1093"><p>Spray foam is expensive,compared to blow in or batts,R value is about 5 per inch,maybe slightly more,personally I would use it for air sealing and blow cellulose over top,to achieve an r value of 50 in an attic you would need to spray close to 10" thick,one area I would look to foam is the rim joist,if you were to pull back the fiberglass batts poked in the pockets during cold winter months,I would guess you would have frost behind them.</p><p>Not a fan of batts,a quick thermal scan of an attic with batts will show you the heat loss through all the gaps and cracks.</p></blockquote><p></p>
[QUOTE="muzzyhunter, post: 376575, member: 1093"] Spray foam is expensive,compared to blow in or batts,R value is about 5 per inch,maybe slightly more,personally I would use it for air sealing and blow cellulose over top,to achieve an r value of 50 in an attic you would need to spray close to 10" thick,one area I would look to foam is the rim joist,if you were to pull back the fiberglass batts poked in the pockets during cold winter months,I would guess you would have frost behind them. Not a fan of batts,a quick thermal scan of an attic with batts will show you the heat loss through all the gaps and cracks. [/QUOTE]
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