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zpm 07-29-2009 08:31 PM

Drywalling Garage
Have a single story house with an attached garage. The wall connected to the house has 5/8 drywall, floor to peak, sealing the garage from the house attic. Rest of garage is open framing.

Is it OK to use regular 1/2 drywall on the remaining garage walls and ceiling?

Scuba_Dave 07-29-2009 08:38 PM

Is there any living space above the garage?
If so 5/8" required on the ceiling

zpm 07-29-2009 08:53 PM


Originally Posted by Scuba_Dave (Post 308399)
Is there any living space above the garage? If so 5/8" required on the ceiling

spiders live there ... "Have a single story house" ...

Gary in WA 07-29-2009 11:35 PM

As long as the drywall on the ceiling is not getting any water based spray texture and the sheets are installed perpendicular to the framing, either 16" or 24" on center. Otherwise, 5/8" is required according to the manufacturers that write the application codes. Page 3, table 1, footnote B: Your local jurisdiction may state differently. Be safe, G

RippySkippy 07-30-2009 07:45 AM

In our area...ceiling AND connecting walls must be 5/8". Check with your local code officials to be certain.

zpm 07-30-2009 07:46 AM

Thanks for the info and document. It will be useful.

I think I'll just go with 5/8 since I may decide to texture the ceiling later.

Termite 07-30-2009 11:10 AM

Scuba Dave's right on as far as the code goes. The IRC code requires 5/8" on the garage ceiling only if there is habitable space above. The wall does not require 5/8" rock in any circumstance in the code.

Gary in WA 07-31-2009 01:20 PM

Good choice, zpm. That is exactly why I stated the manufacture's application code, in case you put up 1/2" and textured it. Many houses I've had to frame drywall backing on the attic truss over the living space garage wall, in order to drywall to the peak on the truss for fire stop (as you posted). Builders found it cheaper than to drywall (5/8") the larger garage ceiling for fire stop.

Be safe, G

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