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Old 04-22-2012, 02:58 PM   #1
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15 minute finish rating...


Does standard drywall have 15 min. finish rating or is this identified as the "fire resistant" drywall. And does a detached residential garage even require a 15 min. finish when nm is used? I have read and read and it seems as though exposed nm is acceptable in an attached garage but not in a detached garage??? I still can't seem to wrap my head around the logic of some of the NEC codes....

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Old 04-22-2012, 03:22 PM   #2
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15 minute finish rating...


1/2" drywall will give you 1/2 hour and 5/8 is rated for 1 hour.

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Old 04-22-2012, 04:59 PM   #3
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15 minute finish rating...


2011 NEC clarified this issue for detached garages.

334.10 Uses Permitted. Type NM, Type NMC, and Type
NMS cables shall be permitted to be used in the following:
(1) One- and two-family dwellings and their attached or
detached garages, and their storage buildings.
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Old 04-23-2012, 11:33 AM   #4
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Originally Posted by Code05 View Post
2011 NEC clarified this issue for detached garages.

334.10 Uses Permitted. Type NM, Type NMC, and Type
NMS cables shall be permitted to be used in the following:
(1) One- and two-family dwellings and their attached or
detached garages, and their storage buildings.
Does nm still require a 15 min finish in a detached garage? I would prefer to leave it exposed.
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Old 04-23-2012, 11:44 AM   #5
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Originally Posted by MisterSteve View Post
Does nm still require a 15 min finish in a detached garage? I would prefer to leave it exposed.
depends what code cycle you are on.

2008 or sooner (back to 2002), yes need the finish.*

2011, no need for finish.

be sure to check with your local inspector, sometimes the NEC is adopted with amendments for your particular area.

*some inspectors allow exposed anyway. the literal interpretation of the code in 2008 would say finish is required but that really wasn't the intent when that section was introduced (2002, i believe). you can run exposed nm in your house so why would a detached, uninhabited structure have more stringent requirements when compared to an inhabited structure? hence the 2011 change to the code.
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Old 04-23-2012, 11:59 AM   #6
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Originally Posted by itsnotrequired View Post
depends what code cycle you are on.

2008 or sooner (back to 2002), yes need the finish.*

2011, no need for finish.

be sure to check with your local inspector, sometimes the NEC is adopted with amendments for your particular area.

*some inspectors allow exposed anyway. the literal interpretation of the code in 2008 would say finish is required but that really wasn't the intent when that section was introduced (2002, i believe). you can run exposed nm in your house so why would a detached, uninhabited structure have more stringent requirements when compared to an inhabited structure? hence the 2011 change to the code.
We are on 2008 NEC but hopefully he will let it fly. I do have the nm drilled through the studs but at about 8.5', the ceiling is at 9'. What's your take on this??? Is it susceptible to physical damage and in need of protection?
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Old 04-23-2012, 12:03 PM   #7
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Originally Posted by MisterSteve View Post
We are on 2008 NEC but hopefully he will let it fly. I do have the nm drilled through the studs but at about 8.5', the ceiling is at 9'. What's your take on this??? Is it susceptible to physical damage and in need of protection?
nm in an attached garage needs to be installed in the same manner as if it was inside your house. this means cables through studs/joists, nail plates if it is lass than 1.25" from the edge of the wood, etc.

if inspector allows it exposed, great! if not, worst case is you will need to put up some drywall or similar to get the 15 min rating. you shouldn't have to tear any wiring out, as long as you installed it the same way you would have inside your house.

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