Sunrise windows

mark101January 30, 2012

my installer uses foam for insulation but said alot of times he measures very well and only can use caulk due to the gap being too narrow ; foam will just fall right out. even using a narrow straw, the foam wrap that comes with the window will prevent the foam from staying in due to the narrow gap.

i think he said the window will come 1/4 inch less than the actual width, 36" will actually come 35 3/4. should we order 35 1/2 exact size so foam will fit?

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HomeSealed

I would follow your installers recommendations. If the new window fits tightly, caulk (window to wood) is sufficient when foam wont fit. Ideally, you want the window as tight as possible, while being able to square it up in an imperfect opening.

    Bookmark   January 30, 2012 at 9:31PM
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mark101

ok.. so as long as its a tight fit no foam is used? he said under 1/4 inch is tough. he said the fill perimeter foam wrap plus a good caulk will be enough. if its a big gap, he will foam. he akways foams the sill, whatever that means.

    Bookmark   January 30, 2012 at 10:31PM
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windowsonwashington

Sounds about dead on in my book.

The sill is foamed because there is a progressively larger gap under it as the wood sloped sill against the square vinyl bottom creates more of a gap.

    Bookmark   January 31, 2012 at 7:20AM
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mark101

so ordering the window a bit smaller so he can foam will not make a difference?

    Bookmark   January 31, 2012 at 8:17AM
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skydawggy

No window opening is perfectly square. When measuring a window we take the smallest measurement and then deduct 1/4 of an inch from it. That means that if the opening is out of square by 1/4 of an inch, that the window could be 1/2 inch off in certain places. This is why foam insulation is used. You are better off having the opening measured as tight as possible and then any gaps filled with foam rather than creating a large gap by intentionally ordering the windows too small with the intent of filling that gap with foam.

Think about it. Why would you want to order the windows too small just so foam insulation could be added?

    Bookmark   January 31, 2012 at 8:45AM
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mark101

point well taken. i guess when installing window from inside, its impossible to foam around outside perimeter? my contractor said the exterior stops would prevent that.

    Bookmark   January 31, 2012 at 9:13AM
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HomeSealed

That is not possible. Most pros (at least in my area) remove the exterior stops for installation rather than the interior.
That said, it doesn't make much difference which side the foam is applied from, it will still seal that gap.

    Bookmark   January 31, 2012 at 7:21PM
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mark101

if its an inside install, how would foam be applied around the exterior perimeter?
if it was an exterior install then the exterior stops would be removed and foam applied. how cannfoam be used, other than sill, if the stops are still in place due to an interior install?

    Bookmark   February 1, 2012 at 7:51AM
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windowsonwashington

You don't foam the exterior if it is in an interior install.

Foam is installed from the inside at that point if required.

    Bookmark   February 1, 2012 at 8:25AM
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mark101

thanks everyone

    Bookmark   February 1, 2012 at 9:28AM
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HomeSealed

What he ^ said. :D

    Bookmark   February 2, 2012 at 5:02PM
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