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chrisd
Updating attached garage with old existing drywall
chrisd

This summer I purchased a 35 yo bungalow with attached 20'x20' garage that I'm planning a few upgrades in. The garage walls and ceiling are insulated with vapour barrier installed and finished with drywall, however the drywall is old and warped, and some sheets have come loose from their nails in a few spots.

Rather than replacing the drywall, I'd like to just install OSB over it (I'd like to avoid mudding and taping drywall if possible). Obviously, I'd install extensions to all of the outlet and switch boxes, and I'd paint the OSB white to brighten things up in there.

Is there any issues involved with this that I'm not considering?

Thanks in advance,
Chris

dj1
Re: Updating attached garage with old existing drywall
dj1

By code, any INTERIOR walls in an attached garage must be dry walled and finished (except paint), so you better check your local code at your local building dept. It has to do with fire regulation.

EXTERIOR walls can be finished with OSB. I prefer dry wall. If you hate taping, mudding and sanding, you could leave the dry walls on the exterior side untapped.

ed21
Re: Updating attached garage with old existing drywall
ed21

Since the OP isn't taking down the existing drywall, I don't think just adding OSB is a code violation. I don't think it's a good idea and won't look very nice although that may not matter.
If the drywall is loose it could possibly be re-screwed with minimal mudding of the screw heads. Pull out the old nails after re-screwing. Don't try to reuse the nail holes to hold the drywall. If the drywall is too warped, pushing it back into place with a 2x wedged between the floor and ceiling with another piece of 2x laid flat at the ceiling to prevent damage to the ceiling.
Yes any wall common to the house is fire resistant wall that needs drywall on each side by code and minimum one layer on the ceiling depending on what's above.

A. Spruce
Re: Updating attached garage with old existing drywall
A. Spruce

Another vote against the use of OSB., if you must go this route, use plywood, it will look better when painted and it will be easier to drill and nail when you want to hang things.

As DJ points out, shared walls between house and garage MUST be drywalled, usually 5/8", as a fire barrier between the two. Non-shared walls can be anything you want, so if you wanted to use ply or OSB here, that would be fine. Be sure to caulk your seams, as this will improve the overall look once painted. Personally, drywall will look better, and it's not really all that hard to tape, once you get the hang of it. BTW, I'd include doing the ceiling as well, for a totally finished look.

Mastercarpentry
Re: Updating attached garage with old existing drywall
Mastercarpentry

Having the drywall under anything negates it's purpose of providing a fire-resistant surface even if it still provides that quality underneath; therefore it will not meet code to cover it with any combustible product. I'd just demo it- not hard to do but messy- then go back with 5/8" type "X" fire-rated drywall. Taping and mudding isn't that hard to do well enough for a garage so look at it it gaining experience with that skill. It's a valuable skill you'll find handy later on, I'm sure. Of you can hire the finishing out.

Just be sure that whatever you do meets code because if it doesn't you'll have problems when it's time to sell and should the worst happen you might find your insurance claim denied.

Phil

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