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09-18-2009, 08:30 PM
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#1
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LRG WoodCrafting
Trade:
Professional Sawdust Producer
Join Date: May 2005
Location: USA, Connecticut
Posts: 3,903
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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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Measure Twice Cut Once -- It's a lot easier to cut more off then it is to cut MORON.
Quote:
Originally Posted by HusqyPro
Carpenter by day.
Mad scientist by night.
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09-18-2009, 08:34 PM
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#2
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Moderator
Trade:
GC - Remodeling Specialists
Join Date: Jul 2006
Location: Arkansas
Posts: 4,467
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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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"My clients’ wishes are the center of my attention." -- David Guido, a contractor in Woodstock, N.Y.
New York Times, July 20, 2006
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09-18-2009, 08:39 PM
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#3
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LRG WoodCrafting
Trade:
Professional Sawdust Producer
Join Date: May 2005
Location: USA, Connecticut
Posts: 3,903
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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?
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?
__________________
Measure Twice Cut Once -- It's a lot easier to cut more off then it is to cut MORON.
Quote:
Originally Posted by HusqyPro
Carpenter by day.
Mad scientist by night.
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http://lrgwood.com
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09-18-2009, 09:04 PM
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#4
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Pro
Trade:
General Contractor
Join Date: May 2009
Location: Mansfield, Texas
Posts: 269
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09-19-2009, 04:15 PM
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#5
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Profit is not dirty.
Trade:
Residential Drywall and Taping
Join Date: May 2008
Location: Prince George BC Canada
Posts: 299
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5/8 drywall studs, insulation, 5/8 drywall.....equals 1 hr fire rating.
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Profit is NOT a dirty word....Cheap is.... 
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09-20-2009, 09:49 AM
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#6
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Pro
Trade:
Plastering, Drywall, Painting, Woodworking, Stucco, refinishing woodwork
Join Date: Jun 2006
Location: South Eastern Michigan outside of Detroit.
Posts: 1,108
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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.
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09-20-2009, 11:55 AM
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#7
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Pompass Ass
Trade:
Certified Building and Certified A/C Contractor
Join Date: Jan 2009
Location: Plant City, Florida
Posts: 1,490
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Quote:
Originally Posted by Frankawitz
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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No, because to get a fire rating the system being used has to be
tested and approved.
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09-20-2009, 12:09 PM
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#8
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---
Trade:
residential framing/general carpentry
Join Date: Feb 2009
Location: Southern New Jersey
Posts: 3,598
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Quote:
Originally Posted by Leo G
Now I'm just being curious.
What would be required to get a 1 hour fire rating using 5/8", 2 sheets thick?
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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. 
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" It's a Jersey thing, you wouldn't understand" 
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09-20-2009, 12:28 PM
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#9
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Pompass Ass
Trade:
Certified Building and Certified A/C Contractor
Join Date: Jan 2009
Location: Plant City, Florida
Posts: 1,490
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Quote:
Originally Posted by loneframer
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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