ceiling drywall thickness: 5/8" or 1/2"? - AVS Forum
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Old 12-28-2004, 10:07 PM - Thread Starter
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If the joists are anywhere from 16"-24", do I need to use 5/8" for better strength to prevent sagging, or is 1/2" ok? Thanks for your help.
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Old 12-29-2004, 08:21 AM - Thread Starter
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bump. Anyone??
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Old 12-29-2004, 08:53 AM
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My joists are 12" o.c. and I used 1/2" for the ceiling. The walls are doubled up with 5/8" on top of 1/2".

Sometimes you reach what's real by making believe.
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Old 12-29-2004, 09:25 AM
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Here is an installation guide and chart showing what you should use.
http://www.usg.com/Expert_Advice/3_4...tion_manls.asp

Normally you use 5/8 on the ceiling, I see from the usg website there is a special 1/2 inch anti-sag sheetrock for ceilings if for some reason you really want to go with 1/2 inch. I'm sure it cost more and is probably only available from a sheetrock supply place, not HD or Lowes. With 16 to 24 o.c. joists I'd use 5/8.

Phil
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Old 12-29-2004, 09:31 AM
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I have both a layer of 5/8 and 1/2 mounted on RC2 with joists 19.2 inches OC. The 5/8 went up first. It pretty much solved the footsteps on the hardwood floor above problem.
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Old 12-29-2004, 12:03 PM - Thread Starter
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I am going to put 5/8" (or another 1/2" with GG, haven't decided yet) for HT. My concern is a soffit outside HT. I have separate furnaces for 1st and 2nd floor. Their ducts run together cross the house and the width is about 10 1/2'. I used 20 gage 1 5/8" metal studs to make the frame for soffit with 3-4 supports to the joists above. So, I have one 10 1/2" long 1 5/8" metal stud with 3-4 supporting attachments to each joist which is anywhere 16"-24" apart. I don't want to add more weight to this soffit frame if I can get away with 1/2".

The anti-sag drywall is interesting. I have to look around.

Thanks.
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Old 12-29-2004, 01:38 PM
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I used both 5/8" layer Type X and a 1/2" layer of drywall on my ceiling. I also used RSIC-1 clips and RC-2 for improved sound insolation from the family room above.

--curtis
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