cable run across insulated wall


Old 10-28-06, 09:41 AM
ddr is offline
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Join Date: May 2006
Location: New York City
Posts: 133
cable run across insulated wall

Hey folks,

When running cable horizontally through studs of an exterior wall that has insulation with a vapor barrier (or when replacing insulation in a wall with an existing cable), should the cable be kept between the barrier and the inside wall or the unfaced side of the insulation and the exterior wall? I’ve seen it both ways and was wondering if there was a code or “unwritten rule” about it. (One time I saw where the installer made a slit in the insulation’s unfaced side so it would “slip over” the cable and keep the insulation flush to the exterior wall which, I would think, could lead to over heating issues.) Would it matter if the cable was NM, AC, or loose wire in EMT raceway?

Thanks in advance.
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Old 10-28-06, 09:47 AM
Join Date: Sep 2003
Location: Central New York State
Posts: 13,973
You can make a slit in the unfaces side of the insulation if you want, or you can just let it bunch around the cable. Do not run the cable between the vapor barrier and the inside wall.

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