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Old 12-19-2013, 11:51 AM   #1
clemsonee
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Default One hour fire rating

I am building a garage and since it is less than five feet from my property line, I am required to have a one hour fire rating for applicable walls. I was told by my local planning office that even if I built it with brick walls that I would still need to have 1/2" Gypsum board on the exterior and 1/2" Gypsum board on the interior. The brick has the required one hour fire rating by itself so I am not sure why I still need to have the gypsum board. Anyone have any info on this or experience with it? My county uses the 2012 international building code.
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Old 12-19-2013, 12:18 PM   #2
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Default Re: One hour fire rating

It's the ole saying, if the local code requires it, your going to have to do it!

It may be worth while to stop by their office and go over their requirements.....
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Old 12-19-2013, 12:25 PM   #3
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Default Re: One hour fire rating

Damn. You could put 5/8ths rock on both sides plus the brick and probably call it a 4 hour wall. But he's right, you do what they tell you. 1/2 drywall is cheap and you only have to fire tape the outside which means you don't even have to spot fill the attachments.
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Old 12-19-2013, 12:25 PM   #4
readhead
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Default Re: One hour fire rating

I would suggest that you go to the office and go over the one hour assembley options with the code official. There may be some options. Don't get sideways with building department. They will usually treat you well if you work with them. The '12 code is pretty restrictive in some areas and you may have found one of those areas.
I know that here brick has never met the 1hr. requirement. We usually install 5/8 X-board behind the brick.

Last edited by readhead; 12-19-2013 at 12:28 PM.
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Old 12-19-2013, 12:29 PM   #5
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Default Re: One hour fire rating

Quote:
Originally Posted by clemsonee View Post
I am building a garage and since it is less than five feet from my property line, I am required to have a one hour fire rating for applicable walls. I was told by my local planning office that even if I built it with brick walls that I would still need to have 1/2" Gypsum board on the exterior and 1/2" Gypsum board on the interior. The brick has the required one hour fire rating by itself so I am not sure why I still need to have the gypsum board. Anyone have any info on this or experience with it? My county uses the 2012 international building code.
I have never heard this before, I work with a lot of commercial fire rated walls and What I would normaly see in this situation would be 2 layers of 5/8 drywall on the inside or 1 layer with rockwool in the stud bays.

I would go talk it over with them, what I think is a misunderstanding, That sounds like a interior wall fire rateing not exterior.
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Old 12-19-2013, 12:57 PM   #6
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Default Re: One hour fire rating

It all about the assembly, not the individual materials. Tell them you want to use a UL-356 construction. This gives you 1-hour.

"U356: 5/8" (15.9 mm) Fire-Shield Gypsum Board applied vertically to interior side of 2x4 wood studs 16" o.c. with 6d coated nails, 1-7/8" long, 1/4" heads, 7" o.c. 3-1/2" insulation installed in stud cavity. 7/16" wood panels applied horizontally or vertically to exterior side with 6d coated box nails 6" o.c. Exterior to be finished with vinyl siding, particle board siding, wood structural panel (lap siding), cementitious stucco, brick veneer, exterior insulation and finish system (EIFS), steel/aluminum siding, fiber cement siding."

You are probably close to this construction already. Pray they don't make you rate your roof construction.
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Old 12-19-2013, 02:11 PM   #7
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Default Re: One hour fire rating

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Originally Posted by Thumper68 View Post
... What I would normaly see in this situation would be 2 layers of 5/8 drywall on the inside or 1 layer (5/8) with rockwool in the stud bays.
This is a good solution because you getting insulation also.

Check on ceiling requirements as well as use of any "special" joint compounds/tape.

If you are hiring it out, make sure the contract states, in writing, "installed to be compliant with local code." Also in writing, state you are going to hold back at least 1/3 of the payment until it is inspected and approved.
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Old 12-19-2013, 02:13 PM   #8
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Default Re: One hour fire rating

Thanks for the input. I will just schedule a meeting with them.
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Old 12-19-2013, 02:19 PM   #9
clemsonee
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Default Re: One hour fire rating

It is 5/8 gypsum on the interior and exterior, one layer, with brick veneer.
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Old 12-19-2013, 06:24 PM   #10
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Default Re: One hour fire rating

Since it is a property line issue, I assume that the fire rating has to be to protect an adjacent property from your building fire. The brick will be attached to the framed wall. If your building fire levels that framed wall, the brick will go down, too.
Any engineer/architect friend or perhaps the local library, or the local code enforcement office should have a copy of the Underwriters Laboratory (UL), Gypsum Association (GA) and/or Factory Mutual (FM) books that described listed fire rated systems. Any system in those books that meets your construction limitations and the fire rating requirements is acceptable under building codes. There are hundreds of them. Check the books, pick a system, then submit the system number to the code office. It should be acceptable to them; that is what architects and engineers do. Then you have to build it exactly as it is listed.
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Last edited by 6768rogues; 12-19-2013 at 06:28 PM.
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Old 12-19-2013, 07:44 PM   #11
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Default Re: One hour fire rating

http://publicecodes.cyberregs.com/ic...2_7_par338.htm

Read up
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Old 12-19-2013, 09:26 PM   #12
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Default Re: One hour fire rating

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Originally Posted by 6768rogues View Post
Since it is a property line issue, I assume that the fire rating has to be to protect an adjacent property from your building fire. The brick will be attached to the framed wall. If your building fire levels that framed wall, the brick will go down, too.
Any engineer/architect friend or perhaps the local library, or the local code enforcement office should have a copy of the Underwriters Laboratory (UL), Gypsum Association (GA) and/or Factory Mutual (FM) books that described listed fire rated systems. Any system in those books that meets your construction limitations and the fire rating requirements is acceptable under building codes. There are hundreds of them. Check the books, pick a system, then submit the system number to the code office. It should be acceptable to them; that is what architects and engineers do. Then you have to build it exactly as it is listed.
uhm, I just gave him this info a couple of posts up. Unless he runs up against a hardass, this should get him through.
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Old 12-20-2013, 07:18 AM   #13
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Default Re: One hour fire rating

Wall assemblies are given an hourly rating based on UL testing. UL assemblies can vary in materials, so you could look at the UL tests for alternatives to achieve a 1 hour PARTY wall.
Be prepared to show the UL info to the building official since there are thousands and they will want the published info

Last edited by KELLHAMMER; 12-20-2013 at 07:21 AM.
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Old 12-20-2013, 07:48 AM   #14
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Default Re: One hour fire rating

Quote:
Originally Posted by clemsonee View Post
It is 5/8 gypsum on the interior and exterior, one layer, with brick veneer.
So that was after the "meeting" ?
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Old 12-20-2013, 11:07 AM   #15
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Default Re: One hour fire rating

This is a case of DEFINITELY finding out all about it before you proceed.

Around here they have the similar regulations. The builders don't use regular drywall, it is pink colored on residential walls on the side exposed to neighbors. On commercial they use yellow colored drywall on the whole exterior of the building. It is not regular drywall.

Every year there are stories of a house burning down and also burning down the houses on either sides.
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Old 12-20-2013, 11:08 AM   #16
clemsonee
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Default Re: One hour fire rating

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So that was after the "meeting" ?
The only thing different than original is 5/8 vs 1/2. No meeting yet, just clarified it with the builder.
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Old 12-20-2013, 07:31 PM   #17
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Default Re: One hour fire rating

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Originally Posted by clemsonee View Post
The only thing different than original is 5/8 vs 1/2. No meeting yet, just clarified it with the builder.
Has your builder dealt with this building inspection department ?
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Old 12-20-2013, 10:17 PM   #18
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Question Re: One hour fire rating

What . . . COUNTRY . . . . . STATE . . . . . CITY ????
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