Air Sealing Electrical Box Knockouts - Spray Foam Or Something Else? - Insulation - DIY Chatroom Home Improvement Forum
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Old 12-28-2019, 10:44 AM   #1
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Air sealing electrical box knockouts - spray foam or something else?


In a room I'm renovating, I'm getting ready to install insulation batts. But before I do, I need to air seal the electrical box knockouts (where the wires enter and exit the outlet boxes).

I was going to use canned spray foam for this. Any tips on minimizing how much foam enters the box? Maybe stuff a rag into the box and press it up against the knockouts while I foam the outside of the knockouts?

Or is there another product that is better suited to this task? Perhaps duct seal putty, like this: https://www.homedepot.com/p/Gardner-...-110/100212441
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Old 12-28-2019, 11:54 AM   #2
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Re: Air sealing electrical box knockouts - spray foam or something else?


Putty pads are easiest if the walls are open.
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Old 12-28-2019, 12:09 PM   #3
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Re: Air sealing electrical box knockouts - spray foam or something else?


Or caulk them on the outside.
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