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Old 03-22-2013, 04:11 PM   #1
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Spray foam


I had a guy give me an estimate to spray foam my vaulted ceilings I put up baffles already for the air flow but he told me I do not need them. Is that right that I won't need air flow between foam n the roof? I thought u always need it

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Old 03-22-2013, 04:32 PM   #2
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If it's foamed you do not need the baffles.

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Old 03-25-2013, 08:49 AM   #3
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Quote:
Originally Posted by joecaption View Post
If it's foamed you do not need the baffles.
+1

Joe is 100% right.

Just make sure they apply appropriate thicknesses.
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Old 03-25-2013, 10:16 PM   #4
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If you live in a high snow area, you will need the venting rather than a "closed roof" to prevent ice dams. The design should be on the plans; if new build/addition, approved by the city/county. Simple gable roofs benefit from ventilation more than complex roof designs, or HVAC in the attic. Your location is important, where are you located?

Gary

PS. pp.3, vents with SPF: http://www.buildingscience.com/docum...n-roof-venting
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Old 03-25-2013, 11:54 PM   #5
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good article
http://www.jlconline.com/insulation/...pray-foam.aspx
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Old 03-26-2013, 03:27 PM   #6
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I reviewed your other posts, 1469, and had a question from this thread; Rafters

Are the "new rafters" bearing on a built-up (multiple pieces) or a solid beam (3-1/2"- 7-1/2" wide)at the top, OR are they bearing against each other with a new 2x board between them?

Not a ridge "board" as in "B", but a ridge "beam" as in "C", scroll down a page here; http://books.google.com/books?id=E5S...raming&f=false

Gary
PS. pp. 105, 106; http://books.google.com/books?id=s-x...thrust&f=false
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Old 03-27-2013, 11:08 AM   #7
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The one guy who came said he will put in 5 in of open cell foam between my rafters. I have a vaulted ceiling n my rafters r only 2 by 6 then I had another salesman who said he would put 3 in of closed cell foam in. He also said that 5 in of open cell could cause condensation n water spots n when I asked the first guy he said that it wouldn't b a problem. Who is telling me the truth? Anyone out there now anything about spray foam n what I should do for the vaulted ceiling with 2 by 6 rafters I'm tired of these salesman just telling me his product is better n there's no problem with what they want to put in
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Old 03-27-2013, 12:21 PM   #8
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Now are they rafters, or trusses? I would always error on the side of ventelation and do tradtional insulation or a BIB system. Foam to me is over rated and not cost effective, or the pay off is years down the road. Plus I am waiting to see these new home done with foam in the attic how fast the roofs need to be replaced as well. I have seen in the pacific north west some homes only ten years old with 50 year shingles being re roofed. from what cause I am not sure. But am willing to bet it has to do with ventilation or the lack there of for the underside of the roof.


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