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ecocco1469 03-20-2013 04:17 PM

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

joecaption 03-20-2013 04:21 PM

Now go back and add your location to your profile for an ansewer. Just go to Quick links to edit.
You could be from anyplace on the planet for all we know.

ecocco1469 03-20-2013 05:43 PM

Long Island

Nailbags 03-20-2013 05:49 PM

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

747 03-20-2013 08:22 PM

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.

woodworkbykirk 03-20-2013 08:40 PM

locally open cell foam runs $3.75 sq ft roughly, closed cell is $4.75,

md2lgyk 03-21-2013 07:44 AM

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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