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Old 01-01-2012, 11:43 PM   #1
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Insulation


Need help with foam insulation on my home. I was told that the foam is used to seal every area of attic so there will be no air flow. I have vents, is it ok that they will have no use anymore?

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Old 01-02-2012, 05:43 AM   #2
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If you mean soffit vents, you do not seal those with foam or cellulose. They should have baffles to allow air flow through the attic, but not down below to the home.

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Old 01-02-2012, 12:30 PM   #3
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I was told that they seal everything in the attic to not allow humidity to come in . It's acts as a cooler in the attic. He said if you allow the moisture to get in that it makes everything worse
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Old 01-02-2012, 02:01 PM   #4
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More information needed.

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Old 01-02-2012, 02:29 PM   #5
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I live in Florida .
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Old 01-02-2012, 02:40 PM   #6
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Perhaps we should start with "who told you this?" And maybe roof type/pitch?
Photos are always worth a thousand words here.

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Old 01-02-2012, 02:58 PM   #7
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Both insulation companies who came out to give me an estimate.
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Old 01-02-2012, 03:07 PM   #8
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I have a tile roof.
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Old 01-02-2012, 03:52 PM   #9
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I can move this to roofing if you wish, the guys there can help you better than I can with this.

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Old 01-02-2012, 04:49 PM   #10
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Insulation


1. So you must have your HVAC in the attic, with all the ducting, is that correct?

2. How thick a layer are we talking about?

3. Will they add fibrous insulation after that?

4. Where will they be spraying? Joists, rafters, ?

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Old 01-02-2012, 04:49 PM   #11
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Ok. Thank you
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Old 01-02-2012, 04:57 PM   #12
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The house is CBS construction. I live in Florida. They are apparently going to spray the tie beams above the ceiling and the roof. The spray foam will be about 5 inches thick which will be a little bit higher than what the 2 by 4 is
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Old 01-02-2012, 04:57 PM   #13
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No fibrous material after
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Old 01-02-2012, 04:58 PM   #14
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Hvac?? There are ducts in the attic . It's a one story home
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Old 01-02-2012, 05:19 PM   #15
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Good to go: http://www.joelstiburek.com/topten/south.htm

http://www.buildingscience.com/docum...d-roof-systems


http://best2.thebestconference.org/pdfs/040_EE11-3.pdf

They all say the same thing, just a different slant. The last one is the paper the second one is from.

And the IRC: "The IRC also prohibits a vapor retarder on the attic floor of conditioned attics so that any moisture that may build up in the attic can dissipate into the house. If wood shingles or shakes are used, a ¼-inch air gap must be left above the roof sheathing, but below the shingles or shakes and roofing felt" Read the whole article: http://resourcecenter.pnl.gov/cocoon...r/article/1520

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