Foaming behind electric box
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Any tips on ways to foam behind an electric box that has already been drywalled around? I don’t think there is any way to remove the box without damaging the drywall.
My thought was to punch one of the knockouts down, insert a small plastic tube, then spray canned foam through it to flood the area behind the box.
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Replies
Use the Dow "pro" foam gun and the disposable plastic tips, which will let you inject foam through small holes down to maybe 3/16" diameter or so. If your electric box has any open screw hole in the back, inject the foam through that. If you can't find a hole, drill a small one for the tip of the gun. This will let you do better than nothing, but you probably won't get a particularly good fill of foam behind the box -- expect some voids.
Bill