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Doug Crf 08-27-2006 12:02 PM

Drywall thickness on ceiling question.
I screwd up an area of my ceiling and now I am having to repair it.
I went and got a piece of drywall to repair the area.
I thought I had read somewhere if the joist are 24" on center then
the ceiling by code has to have 5/8" thick drywall.
It sounded logical to me. since our joist are 24" on center I automatically got 5/8" drywall without
even checking how thick the drywall is on our ceiling.
Well guess what I had to go back and get the 1/2" thick
Did the builders use the wrong thickness or what.
The house was built in 1974.
Thanks Doug

Big Dave 08-27-2006 03:47 PM

I would say yes. Back in '74 they should have used 5/8 thick sheetrock. Today though they have a sheetrock that is 1/2" thick that is designed to span the 24" space between trusses. Last that I knew though it was the same price as 5/8" sheetrock the only difference was it is lighter.


edit: If it is not noticably sagging anywhere, don't worry about it.

J187 08-27-2006 08:05 PM

Yeah, ceilings are definitely a common place for guys to have cheated with the size of the drywall, every saved ounce helps. Not condoning it, just exposing the reality.

joasis 08-28-2006 05:47 AM

I have never looked in IRC to see what it has on this and myu copy is not in front of me, but 1/2 rock is acceptable in my area, but I always go with 5/8...makes a better look, no possiblity of sagging. Lots of homes here in the 60s and 70s were built with 3/8 on the walls and 1/2 on the ceilings.

Commercial work specifies 5/8, but residential is allowed 1/2 inch.

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