Cheapest Option For Unfinished "fire-rated" Ceiling? - General Discussion - Contractor Talk

Cheapest Option For Unfinished "fire-rated" Ceiling?

 
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Old 12-16-2019, 09:50 PM   #1
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Cheapest Option For Unfinished "fire-rated" Ceiling?


This might be a little unconventional, but...

So, a buddy just lost his work shop(auto) to a fire. Cause is yet to be determined, but it got me thinking about my own shop.

I have a 125k btu radiant tube heater in my shop - similar to what he had. Above my reflectors, I have OSB. I am not able to lower my heater tubes, so that's not an option.

I would like to install some sort of barrier to protect the OSB from direct flame in the event of a tube failure of the heater. Not really looking for a complete coverage of the ceiling, just the areas above the tubes.

So, is that best accomplished with fire resistant drywall? Or is there some other type of board available at a reasonable cost? Ceiling height is 14'6", so weight is a factor also.

I have also thought about spacing sheet metal off of the OSB about an inch with ceramic board under the screws - but mostly open air space. Not sure what to do about heat transfer from the screws themselves in the event of a fire.

Let me have it.

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Old 12-16-2019, 09:52 PM   #2
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Re: Cheapest Option For Unfinished "fire-rated" Ceiling?


5/8 drywall and a single layer of tape on the joints and screws.

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Old 12-16-2019, 10:00 PM   #3
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Re: Cheapest Option For Unfinished "fire-rated" Ceiling?


I have a piece of cement board above my barrel stove, attached to the floor joists.
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Old 12-16-2019, 10:06 PM   #4
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Re: Cheapest Option For Unfinished "fire-rated" Ceiling?


Ive got blown in cellulose above the OSB
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Old 12-16-2019, 10:21 PM   #5
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Re: Cheapest Option For Unfinished "fire-rated" Ceiling?


All of the OSB in the shop should be covered at a minimum of 1/2" drywall and fire taped.
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Old 12-17-2019, 03:04 PM   #6
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Re: Cheapest Option For Unfinished "fire-rated" Ceiling?


like Leo said 5/8 fire rated drywall

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Old 12-17-2019, 06:27 PM   #7
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Re: Cheapest Option For Unfinished "fire-rated" Ceiling?


As mentioned, 5/8" type 'X' gyp. board.

As an aside cement board isn't rated as a fire retardant material. It's considered similar to a frying pan, will transmit the heat through it. When we've used it as part of a fire rated assembly we've had to put the 5/8"type 'X' behind it to get any fire rating.
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Old 12-17-2019, 06:35 PM   #8
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Re: Cheapest Option For Unfinished "fire-rated" Ceiling?


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As mentioned, 5/8" type 'X' gyp. board.

As an aside cement board isn't rated as a fire retardant material. It's considered similar to a frying pan, will transmit the heat through it. When we've used it as part of a fire rated assembly we've had to put the 5/8"type 'X' behind it to get any fire rating.
Good to know.

I have it on 2 sides of the barrel also. The back is probably 12" away. I've never felt any heat on the back even after the stove has been going all day.
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Old 12-17-2019, 06:53 PM   #9
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Re: Cheapest Option For Unfinished "fire-rated" Ceiling?


Years ago the city made me double the 5/8 rock
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Old 12-17-2019, 07:18 PM   #10
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Re: Cheapest Option For Unfinished "fire-rated" Ceiling?


That would be a fire wall. Usually an attached garage on a house.
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Old 12-17-2019, 07:28 PM   #11
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Re: Cheapest Option For Unfinished "fire-rated" Ceiling?


what the op is describing & asking for is NOT a fire rated assembly but rather just a heat shield.

HUGE difference between the two.
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Old 12-17-2019, 08:23 PM   #12
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Re: Cheapest Option For Unfinished "fire-rated" Ceiling?


I would get metal and space it away from the OSB about 2" for good airflow behind it.

Just don't use thin galv. sheet metal
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Old 12-17-2019, 08:54 PM   #13
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Re: Cheapest Option For Unfinished "fire-rated" Ceiling?


Quote:
Originally Posted by griz View Post
what the op is describing & asking for is NOT a fire rated assembly but rather just a heat shield.

HUGE difference between the two.

True, Griz.

My buddy's fire and the fact that I just replaced two separate heater tubes at work, got me thinking.

The tube failures at work are probably very much related to nearly 100% operation in cold weather for 10+ years. Possibly partial obstructions(birds nests) in the exhaust too. But, seeing the tubes split open and fire coming out of it makes a person wonder. Incidentally, the split in the pipe has to be significant for the flames to get wider than the reflector.

I am not concerned enough to change heat sources, just to try to make my installation a little more bullet proof.

The weight of the 5/8 drywall is enough to make it among my last choices. And doing the whole ceiling is not really in my scope.
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Old 12-17-2019, 10:44 PM   #14
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Re: Cheapest Option For Unfinished "fire-rated" Ceiling?


Sheet metal spaced at least an inch away from the OSB would definitely help deflect a lot the heat.
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Old 12-18-2019, 05:26 PM   #15
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Re: Cheapest Option For Unfinished "fire-rated" Ceiling?


Quote:
Originally Posted by acro View Post
True, Griz.

My buddy's fire and the fact that I just replaced two separate heater tubes at work, got me thinking.

The tube failures at work are probably very much related to nearly 100% operation in cold weather for 10+ years. Possibly partial obstructions(birds nests) in the exhaust too. But, seeing the tubes split open and fire coming out of it makes a person wonder. Incidentally, the split in the pipe has to be significant for the flames to get wider than the reflector.

I am not concerned enough to change heat sources, just to try to make my installation a little more bullet proof.

The weight of the 5/8 drywall is enough to make it among my last choices. And doing the whole ceiling is not really in my scope.
they sell ultra lightweight 5/8s and 1/2 drywall,

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