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Old 01-15-2012, 10:15 PM   #1
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Default Spray foam?

Can you spray foam over romex wires? Are there any derating issues by doing that?

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Old 01-15-2012, 10:20 PM   #2
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I guess there would be if it melts all the insulation away. otherwise, I think there would have to be extenuating circumstances (o/w known as bundling) for there to be an issue

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Old 01-15-2012, 10:23 PM   #3
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Inspector here told us that it had to be fire rated
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Old 01-15-2012, 10:45 PM   #4
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Inspector here told us that it had to be fire rated
..are you going thru a fire rated wall?
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Old 01-15-2012, 11:20 PM   #5
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I guess there would be if it melts all the insulation away. otherwise, I think there would have to be extenuating circumstances (o/w known as bundling) for there to be an issue
Have you ever seen bundling in a residential application?
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Old 01-15-2012, 11:23 PM   #6
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is spray foam any different than being packed in a wall with insulation..
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Old 01-15-2012, 11:33 PM   #7
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is spray foam any different than being packed in a wall with insulation..
foam attaches to the cable . thats the only difference i can think of
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Old 01-15-2012, 11:37 PM   #8
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personally i dont think its a problem, only because ive done several jobs with spray foam insulation on new homes and its never been mentioned.. I wouldnt worry about to much..
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Old 01-15-2012, 11:49 PM   #9
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personally i dont think its a problem, only because ive done several jobs with spray foam insulation on new homes and its never been mentioned.. I wouldnt worry about to much..
Not really worried..I'm just waiting for an inspector to say someting."That can't be like that. You have to channel the foam out."lol
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Old 01-16-2012, 12:15 AM   #10
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is the foam you speak of like " great stuff " that stuff is anything but great
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Old 01-16-2012, 12:46 AM   #11
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we had one guy give us a hard time once with MC and fire insulation in a new daycare center. We had to break it off in some areas.
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Old 01-16-2012, 03:02 AM   #12
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Had to do it on one local resi home theatre job. Passed inspection just fine, the foam doesn't eat away at the plastic.
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Old 01-16-2012, 06:03 AM   #13
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Where more than two NM cables containing two or
more current-carrying conductors are installed, without
maintaining spacing between the cables, through the same
opening in wood framing that is to be fire- or draft-stopped
using thermal insulation, caulk, or sealing foam, the allowable
ampacity of each conductor shall be adjusted in accordance
with Table 310.15(B)(2)(a) and the provisions of
310.15(A)(2), Exception, shall not apply.
Where more than two NM cables containing two or
more current-carrying conductors are installed in contact
with thermal insulation without maintaining spacing between
cables, the allowable ampacity of each conductor
shall be adjusted in accordance with Table 310.15(B)(2)(a).
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Old 01-16-2012, 06:06 AM   #14
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Quote:
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Can you spray foam over romex wires? Are there any derating issues by doing that?

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thank you McClary


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Old 01-16-2012, 06:08 AM   #15
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Quote:
Originally Posted by mcclary's electrical View Post
Where more than two NM cables containing two or

more current-carrying conductors are installed, without
maintaining spacing between the cables, through the same
opening in wood framing that is to be fire- or draft-stopped
using thermal insulation, caulk, or sealing foam, the allowable
ampacity of each conductor shall be adjusted in accordance
with Table 310.15(B)(2)(a) and the provisions of
310.15(A)(2), Exception, shall not apply.
Where more than two NM cables containing two or
more current-carrying conductors are installed in contact
with thermal insulation without maintaining spacing between
cables, the allowable ampacity of each conductor
shall be adjusted in accordance with Table 310.15(B)(2)(a).

you wouldn't happen to have the HB commentary following that?

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Old 01-16-2012, 06:12 AM   #16
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Quote:
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you wouldn't happen to have the HB commentary following that?

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Old 01-16-2012, 06:53 AM   #17
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Great Stuff spray foam is not permissible as a draft stop in any application thicker than 1". So if you drill through a 2"x4" bottom plate, then draft stop it with spray foam- you are in violation. I know this b/c an inspector failed me and I challenged him. I called the manufacturer of the foam to request a ms data sheet and was informed by Great stuff that it in fact is not good for any application over 1" thick. Had to dig all foam out holes and re caulk. Have never purchased as a draft stop again.
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Old 01-16-2012, 11:23 AM   #18
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Quote:
Originally Posted by CDN mini-EC View Post
Had to do it on one local resi home theatre job. Passed inspection just fine, the foam doesn't eat away at the plastic.

A few years back I had that foam ins. burn thru some bell/phone cables.
What a PITA replacing that. Now I use the good cable.
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Old 01-16-2012, 11:28 AM   #19
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How about when some jerk off fills a receptacle box with spray foam on an exterior wall, those are always fun.
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Old 01-16-2012, 11:31 AM   #20
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I've only used the spray foam a few times on the odd resi job I did. I never had the issue with eating the sheath or with the inspector saying it wasn't suitable, as were indicated above. It seems ludicrous that the foam can't be used for draft stopping (AFAIK they allow anything and everything around here for draft stopping) - of course, I'm not talking about firestopping, which requires a rated material. And draftstopping in a wood wall that requires fire blocking, would of course require fire rated material. So I'm a little suprised that foam is not allowed - I'm gonna check that out next time I have a job like that. Anybody have an idea where that might be in any of the codes ? (IRC ?)

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