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Old 03-04-2011, 01:09 PM   #1
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ceiling boxes and infiltration


What's the best way to seal a ceiling box for infiltration in an old house?

I'm talking about the kind of octagon boxes normal light fixtures hang from.

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Old 03-04-2011, 06:27 PM   #2
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ceiling boxes and infiltration


Seal around the edges with spray foam such as "Great Stuff".

Cut a sheet of sheet rubber such as rubber roofing material slightly larger than the box cover so when the cover is screwed on the box is sealed off from the room.

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