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Old 08-08-2017, 05:21 PM   #1
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Wiring stapled to back of knee wall studs?


I'm working on remodeling a 3rd floor/attic (with permanent stair access) in an older home. As I'm running electric wiring for outlets much of the length of the runs falls behind attic knee walls in the 4 corners of the space.

I'm wondering if it is permissible to run the wires on the back side of the knee wall studs, secured with staples, rather than drilling through the studs. I haven't been able to find any discussion online as to whether or not this violates any codes. It wouldn't be a huge deal to drill, but I'd rather not if it's clearly permissible to run behind studs.

The space behind the knee walls will be unconditioned space with service access only through 20"x30" access panel doors.
House is in Kansas City, KS.
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Old 08-08-2017, 05:46 PM   #2
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Re: Wiring stapled to back of knee wall studs?


If you can run them behind the studs in a basement finish up, I am not sure why they would take issue with this.

That said, it is easiest to insulated knee walls with rigid foam so that might be easier and safer if the wire is through the studs.
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Old 08-08-2017, 05:47 PM   #3
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Re: Wiring stapled to back of knee wall studs?


The main thing you need to do is make sure all the cabling is protected. You can staple cables on framing members in areas that are not prone to traffic. At your access panel, make sure it is up and out of the way of your movement.
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Old 08-08-2017, 08:47 PM   #4
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Re: Wiring stapled to back of knee wall studs?


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Originally Posted by Windows on Wash View Post
If you can run them behind the studs in a basement finish up, I am not sure why they would take issue with this.

That said, it is easiest to insulated knee walls with rigid foam so that might be easier and safer if the wire is through the studs.
Thanks, Windows. I'm glad you brought up insulating the knee walls as that is the next topic I was going to ask about... I've read recommendations for insulating knee walls with rigid foam board, faced fiberglass batts, and combinations of the two, but I'm concerned that using both would create a double vapor barrier -- Kansas City gets pretty cold in the winter --... for that matter, would using rigid foam behind studs and painted sheetrock on outside of studs create a double vapor barrier???

I don't want to over complicate insulating them, but have heard multiple different methods recommended. Perhaps this is better in a separate thread under insulation...
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Old 08-09-2017, 05:08 AM   #5
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Re: Wiring stapled to back of knee wall studs?


You can use Roxul with or without the foam, depending on the depth of your studs. It needs no vapor barrier, is water proof, vermin proof, fire proof and mold proof. In addition at 3 1/2" it gives an R value of 15, where fiberglas is only R13.
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Old 08-09-2017, 09:11 AM   #6
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Re: Wiring stapled to back of knee wall studs?


Climate Zone 4.

https://energycode.pnl.gov/EnergyCod...state=Missouri

You don't require any vapor barrier and as long as you don't use a faced insulation on the interior wall or wall paper, you can put foam to the outside without any issues.

https://buildingscience.com/document...vapor-barriers

http://www.greenbuildingadvisor.com/...vapor-barriers
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