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  1. #1
    Join Date
    Apr 2008
    Posts
    1

    Default Expanding foam for Weight Pockets

    We are replacing the original double hung windows in our 1920's house with vinyl replacements. The weight pockets are not accessable from the front wall (behind the moulding) so we are planning to use expanding polyurethane foam (think "Great Stuff") to fill the voids. We like the high R-value and the closed cell sealant properties. Does anyone have experience or opinions on this method of insulation? Advice on where to purchase in bulk or which products work best (we have 30 windows). Thanks.

  2. #2
    Join Date
    Aug 2007
    Posts
    7,160

    Default Re: Expanding foam for Weight Pockets

    Don't just squirt expanding foam in through the pulley slot. Expanding foam creates hydraulic pressure great enough to distort or pop the window frames and casing. You don't want to create problems to deal with later. You'd be better off removing the trim from around the windows to apply the foam to the spaces. You'll get better filling of the cavities and your foam will go further (do more windows per can ). If too much is applied, it will have room to expand and can be trimmed off later before the moldings are reinstalled.

    Just a note on expanding foam. A 1/4" bead will expand to over an inch, so you can see where overfilling a confined space will result in problems.
    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

  3. #3
    Join Date
    Jun 2007
    Location
    Shamokin, Pa.
    Posts
    645

    Default Re: Expanding foam for Weight Pockets

    On the lower sides of the old window frame will be access panel. Said panel is usually held in place by a straight head screw.
    Remove the weight in that panel because it is no longer in use.
    Then use that opening to refill the pocket as well.

  4. #4
    Join Date
    Aug 2007
    Posts
    7,160

    Default Re: Expanding foam for Weight Pockets

    Quote Originally Posted by Ernie_Fergler View Post
    On the lower sides of the old window frame will be access panel. Said panel is usually held in place by a straight head screw.
    Remove the weight in that panel because it is no longer in use.
    Then use that opening to refill the pocket as well.
    In all my years I think I've only come across one house that had these access panels. I grew up in an 1800's era Vicky - no access. This might be a west coast thing, I don't know, but access is not always there.
    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

  5. #5
    Join Date
    Dec 2008
    Posts
    8

    Default Re: Expanding foam for Weight Pockets

    30 windows, thats a lot. Ok, call an insulation spe******t, someone that specializes in the expanding foam. There is a certain formulation that can be poured into existing walls. When it expands, it expands up, and does not apply great amounts of pressure on walls, or frames. I think this might be a perfect solution for you. Also, you don't need access. They drill a hole to insert their hose into and then plug it when done.

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