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Old 05-22-2019, 12:35 PM   #1
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Leaky Windows


I have a 1950s brick house, with newer double-hung vinyl windows. No insulation at all in the walls. During cold windy weather, I can feel a very strong cold breeze coming in all around the window, at all of the seals. I took the interior trim off, and see just open wall inside.



Obviously the best way to fix this is by demoing all of the drywall, spray foaming, and then then redoing the whole interior. Not going to happen. I would simply like to limit the cold air that gets in when the wind blows, but I don't know how to spray foam the windows from the inside. Any ideas?
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Old 05-22-2019, 05:08 PM   #2
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Re: Leaky Windows


You can pull off the trim and spray foam between the rough opening and the window or you can seal the gaps in the trim with caulking.

Keep in mind, the air you feel coming in is leaving somewhere else and isn't necessarily able to be fixed in some situations depending on the exterior of the home.



Look up Air Sealing and Insulation. Start there.
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Old 05-22-2019, 07:28 PM   #3
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Re: Leaky Windows


Make sure to use low expanding foam!
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Old 05-22-2019, 09:10 PM   #4
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There is no rough-in frame; the window is simply a hole in the wall. I have nothing to spray foam, because it's an open cavity between the drywall and the brick.
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Old 05-23-2019, 07:06 AM   #5
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Re: Leaky Windows


Can you pull off the trim around the window?
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Old 05-23-2019, 08:25 AM   #6
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Re: Leaky Windows


Yes, hard to tell in the photo but there's a 1.5" wide strip of thin flat vinyl on the inside, that comes right off. It seems to cover the gap from the start of the glass to the inside edge of the drywall. That spot seems to be the worse offender of the cold air leakage, since it's all empty wall cavity behind it.

The walls are so thick on this house, the window is flush with the outside but set a couple of inches in to the wall from the inside.

I'm already talking to some insulation contractors to beef up the attic insulation, but I can feel every gust of cold wind- it's more than a draft, there's a legit breeze coming in and it's dependent on how windy it is outside.

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Old 11-02-2019, 02:55 PM   #7
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Re: Leaky Windows


Go outside the house and carefully inspect the area all around the window and nearby. The air is entering through a crack, which will be visible. You only need to caulk the crack, but it must be dry. In the morning it may be wet from morning dew, and if there was rain the night before it may be wet. Types of exterior caulk are explained in DIY Wall Insulation.
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