Spray Foam Inside Metal Door - Insulation - DIY Chatroom Home Improvement Forum

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Old 11-13-2012, 07:21 AM   #1
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Spray foam inside metal door

Found out a basement door is hollow and has holes on top. Can I use low pressure spray foam ( the kind for use around windows) and fill the core of the door? Will this add insulation value? I realize I'd have to add it small amounts at a time due to pressure ckncerns


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Old 11-13-2012, 09:56 AM   #2
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Would it be a PITB and possible damage the door, also yes.

You could drop a really long hose to the bottom of the door and spray from bottom up but the concern is that you bridge a location and the foam over pressurizes (largely because you will be putting so much down) and messes up the door.

You may have an issue with the curing of the foam as well because you will be putting so much in and there will be little moisture/air to cure up.


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Old 11-13-2012, 10:05 AM   #3
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If that's an intererier door being used as an exterier door there's not going to be any sealing around the sides or the threshold where the real air leaks are.
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Old 11-13-2012, 02:14 PM   #4
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Cut a few decent size holes in it and use dense pack cellulose?
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Old 11-13-2012, 09:35 PM   #5
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Usually those doors have a honeycomb core made of cardboard to keep them from compressing if someone pushes against it.

Take your door knob out and look inside the hole. See if you already have a Styrofoam core or cardboard core inside. I doubt that the door is completely hollow.
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