Fire Rating Question.
 
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Old 09-18-2009, 09:30 PM   #1
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Fire Rating Question.

I was on another forum and this guy was saying that 5/8" drywall loses its 1 hour fire rating if it is put on a ceiling with 24" OC. Why would this be? Or is it not?

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Old 09-18-2009, 09:34 PM   #2
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Re: Fire Rating Question.

Sag. Case of the droopy drywall. USG stuff only has drawings for approved 1 hr assemblies in wood frame on 16 OC, not 24.
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Old 09-18-2009, 09:39 PM   #3
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Re: Fire Rating Question.

Now I'm just being curious.

What would be required to get a 1 hour fire rating using 5/8", 2 sheets thick?

I have heard of ceiling board which is stiffer and designed for 24 OC. Does it come in a 5/8" and would it have the fire rating?
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Old 09-18-2009, 10:04 PM   #4
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Re: Fire Rating Question.

I prefer this site ... http://www.nationalgypsum.com/resour...r/default.aspx
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Old 09-19-2009, 05:15 PM   #5
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Re: Fire Rating Question.

5/8 drywall studs, insulation, 5/8 drywall.....equals 1 hr fire rating.
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Old 09-20-2009, 10:49 AM   #6
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Re: Fire Rating Question.

I always use 5/8s in all my ceiling repairs then coat tham with 1/8" Durabond 90 and the 1/8" topping, I wonder if this raises the rating.
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Old 09-20-2009, 12:55 PM   #7
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Re: Fire Rating Question.

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I always use 5/8s in all my ceiling repairs then coat tham with 1/8" Durabond 90 and the 1/8" topping, I wonder if this raises the rating.
No, because to get a fire rating the system being used has to be
tested and approved.
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Old 09-20-2009, 01:09 PM   #8
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Re: Fire Rating Question.

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Now I'm just being curious.

What would be required to get a 1 hour fire rating using 5/8", 2 sheets thick?
We had the option of either double 5/8" X on 16" centers framing, or using metal track with one layer of 5/8" X. That was several years ago, things may have changed.
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Old 09-20-2009, 01:28 PM   #9
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Re: Fire Rating Question.

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We had the option of either double 5/8" X on 16" centers framing, or using metal track with one layer of 5/8" X. That was several years ago, things may have changed.
How can you get a 1 hour rating with 1 layer of 5/8 type X, when you get 20 minutes for 1 layer of 5/8 type x, and 20 minutes for the stud?
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