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Old 07-04-2015, 09:18 PM   #1
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New construction windows and gaps sealing


Hi guys,

We have a small kiln-dried log cabin construction in-flight. It's under roof now. I asked builder how he's gonna seal gaps between log and window frame. He said he plans on stuffing as much insulation as he can and trim around, inside and outside.

My question is if I'd be better of using low expanding foam in place of insulation? When I asked him this same question he said "Foam expands it puts unneeded pressure on windows, which can lead to problems opening and closing". I thought low expanding type of foam was supposed to fix that problem.

I'd really appreciate your suggestion. I would even do it myself if I need be.

Thanks in advance.

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Old 07-04-2015, 10:17 PM   #2
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New construction windows and gaps sealing


Low pressure window and door foam is just that...low pressure.

It will not create operation issues for your windows if it is used properly.

Don't try to seal larger gaps in one pass.

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Old 07-05-2015, 06:34 AM   #3
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New construction windows and gaps sealing


And compressed fiberglass insulation "jammed" in there does nothing, may as well stuff in an old sock.
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Old 07-05-2015, 10:24 AM   #4
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New construction windows and gaps sealing


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Originally Posted by Windows on Wash View Post
Low pressure window and door foam is just that...low pressure.

It will not create operation issues for your windows if it is used properly.

Don't try to seal larger gaps in one pass.
Great. Most of the gaps there are rather wide at about 1" or so. I can do a 1/2" pass at a time letting it harden while working on another window. And then do a final pass to seal it off.

Thanks.
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Old 07-05-2015, 10:38 AM   #5
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New construction windows and gaps sealing


+1

Do smaller passes. Spritzing the opening with a mist of water will make the foam cure faster if we don't have any humidity but there is plenty of that in the air right now.

Be sure to not foam the bottom all the way to the backside of the flange or you will block the drainage. You only foam the bottom about midway deep on the window so that you get air seal.
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Old 07-05-2015, 10:53 AM   #6
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Be sure to not foam the bottom all the way to the backside of the flange or you will block the drainage. You only foam the bottom about midway deep on the window so that you get air seal.
Thanks for the bottom piece suggestion. Makes sense. Thanks for your help.
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Old 07-05-2015, 03:05 PM   #7
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That's a huge gap.
If it was mine I'd start with wide gap foam for the first pass.
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Old 07-05-2015, 05:45 PM   #8
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That's a huge gap.
If it was mine I'd start with wide gap foam for the first pass.
Wouldn't wide gap foam be hard to control? In another words, wouldn't it expand to cover the entire gap pretty rapidly?

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