Air Sealing Electrical Boxes (Expanding Foam.)

molo said:

Hello,

I'm working on a new renovation with new wiring and access to the open framing. I would like to prevent air leakage around all electrical boxes.

One thought I have is to use expanding foam around the outside of the boxes. Is this OK?

Thanks in Advance,
Bill

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Homeownerinburb said:

There are specific foams for closing holes drilled to chase NM thru framing. Look at some of that.

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LLigetfa said:

Google is your friend. Search for:

fireblock foam electrical

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molo said:

I talked to a rep. at Dow today. They said that their standard "great stuff" foam is OK around electrical boxes and insulated wires. However, it is not OK inside the box or in contact with bare copper.

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Jim Port said:

I doubt that fireblock caulk or foam is required. The OP is not sealing fire rated areas, except for maybe floor penetrations and that is only is the floor is a rated assembly.

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