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Badfish740 01-14-2011 10:05 AM

OSB over sheetrock in attached garage
I have an attached one car garage. It was sheetrocked, taped, spackled and finished with a topcoat of white semi-gloss when the house was built 40 years ago, so as you can imagine, it looks like hell now. There are dents and gashes everywhere, stains, spraypaint overspray, nail pops, dimples, and cracks in the tape joints. Rather than repairing all of the damage, repainting, and trying to keep it looking nice, I thought of simply covering it over entirely with 7/16" OSB. I've seen this done before and from my understanding when it's being done on a new garage or one that's been completely gutted, sheetrock must be used for the common wall for fire safety. I've gotten conflicting reports as to whether or not the sheetrock or the OSB should be on top (or whether it matters), so I left a message with my local building inspector, but I was curious if anyone had experience with this issue here.

gregzoll 01-14-2011 11:03 AM

Answer would be no. If needing to fix the Drywall, especially on the shared walls with the living space, you need to either fix, or tear off and replace with new 5/8". Preferably Green board is used for the bottom layer. If you want to keep the bottom part from getting beat up, then yes you could place primed & painted 1/2" Ply or OSB over the first layer of 5/8" Gypsum, but I would not do the whole garage, because of fire codes.

kwikfishron 01-14-2011 11:10 AM

” sheetrock over what you got would clean it right up.

gregzoll 01-14-2011 12:02 PM


Originally Posted by kwikfishron (Post 569975)
sheetrock over what you got would clean it right up.

It is not fire code for an attached garage.

dtsman 01-14-2011 02:21 PM

He did not say where he is from. I have worked in 3 states and never heard of fire rated drywall being required anywhere in a single family unit. If this is a multifamily unit (townhouse, duplex, etc.) and this is a shared wall, then possibly.

The question posed is can he overlay the wall with wood and avoid drywall work. My answer would be yes based on the information given. It finishes off nice when sealed with some polyurethane.


If the women don't find you handsome,
they should at least find you handy.
(Red Green)

mrgins 01-14-2011 03:54 PM


Originally Posted by gregzoll (Post 569997)
It is not fire code for an attached garage.

It would be ok over the existing fire rated dw

jklingel 01-15-2011 03:37 PM

no doubt bout it, imo. thin sheet rock over top; fast, cheap, and more fire protection.

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