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  1. #1
    Join Date
    Nov 2010
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    1

    Default spray foam insulation decisions

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    Last edited by maptax1; 10-20-2011 at 04:02 PM.

  2. #2
    Join Date
    Aug 2007
    Location
    The Great White North
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    4,045

    Default Re: spray foam insulation decisions

    The definitve answer would come from your local building department.

    However, if you have ductwork and /or HVAC equipment in the attic then having open ventilation is counter productive for the equipment. Having that space at the same temperature as the outside greatly taxes the HVAC syatem.
    Personally I would choose closed cell foam sprayed to all surfaces ( underside of the roof , gable walls , floors ) of the attic with no vents. You will create a conditioned space that would be more temperature regulated and easier on the HVAC system.
    "" an ounce of perception -- a pound of obscure "
    - Rush

  3. #3
    Join Date
    Sep 2009
    Posts
    6

    Default Re: spray foam insulation decisions

    Maptax1 -

    I did the closed cell foam about 2 years ago and it's one of the best things that I've done with my house. I totally agree with everything that CANUK wrote and I'll add that...

    1) It paid for itself the the first winter that I had it installed, here in Boston. $3400 was the cost. $2000 back in rebates and we saved a little bit more than the $1400 difference that winter. And later that summer, the house was noticeably cooler as the attic never got that hot.

    2) Soundproofing. I live about 5 miles from an airport and when the windows and doors are closed in the late fall, winter and early spring here, its MUCH more quiet. I don't feel the vibrations from those 'low-flyers'. And the house feels more solid.

    And lastly, I'm going to foam my basement in a few weeks with the same stuff.

    Seal it up and move on to your next project - vf

  4. #4
    Join Date
    Mar 2009
    Posts
    1,387

    Default Re: spray foam insulation decisions

    all attics that are not encapsulated or heated have severe temp changes depending on the season. Have you considered installing an whole house attic fan or more roof venting like a continuous ridge cap vent and more soffit vents? Might check out installing ATTIC FOIL atticfoil.com its real cheap and easy to install and helps bunches

  5. #5
    Join Date
    Dec 2010
    Posts
    5

    Default Re: spray foam insulation decisions

    This is a great choice if you have small areas that you need filled.Instead of attempting to push loose insulation into these areas it can be sprayed in.
    The foam hardens and supplies insulating qualities to the areas where it has been applied
    Greentech for all your Hidden Content , dry lining needs

  6. #6
    Join Date
    Dec 2009
    Location
    MIchigan
    Posts
    68

    Default Re: spray foam insulation decisions

    Small point here. Foam is better for thermal insulation but NOT for acoustic. Foam is too dense, and will couple the two outer surfaces of the wall.
    ____________________
    Keeping it Quiet

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