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Old 03-20-2013, 04:17 PM   #1
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Insulation foam

I built a vaulted cieling n am getting spray foam. Should I get open cell or closed cell foam. What's the difference n which should I put on my vaulted ceiling. My rafters r only 2 by 6s. That's y I'm spray foaming them. Anyone know the difference n would either help or hurt


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Old 03-20-2013, 04:21 PM   #2
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Old 03-20-2013, 05:43 PM   #3
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Old 03-20-2013, 05:49 PM   #4
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Vaulted ceiling must be at a R-38 how many inches of foam are you spraying in? and are you leaving enough of a gap to have air move so you don't prematurely kill your roof? the roof sheathing needs to breath. or your shingles will curl and cause you to replace your roof way sooner then needed. I hate vaulted ceilings just for that cause. you have to put air channel baffles all the way along the truss and sheathing then either foam spray $$$$ there or HD FG batts. either way pain in the butt to get to R-38

Last edited by Nailbags; 03-20-2013 at 05:53 PM.
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Old 03-20-2013, 08:22 PM   #5
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Close cell is more expensive because it has more r value then open. Actually there is a little more to it then this. But its the bottom line.
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Old 03-20-2013, 08:40 PM   #6
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locally open cell foam runs $3.75 sq ft roughly, closed cell is $4.75,
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Old 03-21-2013, 07:44 AM   #7
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2x6 rafters seem pretty small for an area that gets lots of snow. I have a 12/12 vaulted ceiling in my log house (Eastern WV) and the rafters are 2x12s. A real pain to put up (long and heavy), but during Snowmageddon a few years ago we had 4 feet of snow on the roof for several days without a problem. And, as Nailbags said, it's going to be tough for you to get R-38 insulation.


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