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OT Drywall ? best way to finish attached garage

I

IHC Red

Member
I have a 24x30 2.5 stall attached garage which previous owner insulated and drywalled. Ceiling is taped (no second coat of mud and needs repair in places). Wall shared with house is taped and almost ready for primer. This wall will be primed and painted without further material covering. The entire garage shell is insulated.

I would like to repair the ceiling and prime/paint after spraying with orange peel. Will it be O.K. to orange peel the ceiling instead of traditional "cottage cheese" ? Any other ideas to finish.

Wall height is 8' 5.5". Drywall sheets are installed horizontally. I want to install 9'x 1/2" OSB sheets vertially. Then prime and paint without finishing joints. Is there any reason (other than the cost of materials) which would make this a bad idea ?

Contractor buddy wants me to install fiberglass laminated osb at $35 / sheet. Also, this product doesn't come in 9' sheets from local supplier.
 
Assuming the shared wall, was already accepted and code compliant when the house was built, probably not an issue. That is the only wall between the garage space and occupied space, it would usually be of a type that would provide an hourly fire rating as per your local code, if you add combustible material to it, there may be a code or safety issue. For acceptable and or rated wall assemblies, refer to the latest edition of the U.L. Fire Resistance directory.

Other than that depending on what you plan to do in there, is what should determine what you finish off with. There are Gyp. board types that are also polycarbonate covered + many kinds and types of sheet goods out there, the longer length to avoid the joints might be an item you would have to order, GP or one of the big manufacturers probably make it in 10's, just you have to find a supplier that can get it for you.
 
The burn potential makes it a bad idea on an attached garage. You're also installing the OSB in the wrong strength direction, which may not matter, but will tend to avoid it helping (in a case of extreme weather, for instance), either. If you want a wall you can mount stuff to, lay in 4x8 OSB the right direction, cut filler strips, and then rock, tape and mud over it for the fire protection aspect. Or use something like 1/2" hardipanel or durock (which comes in 3x5 sheets, so you get your 9 feet high) for a solid wall you can attach to that's not also combustible.
 
Why are you covering the drywall with osb? either finish and paint or texture and paint just by thinning the joint compound a little and mix well apply with a roller let set just a little and knock down with a trowel then primer and paint of just cover it with white metal like a pole barn metal you can order it in almost any length it is about 2.75 lin foot x 3' wide and it will protect as good as osb and will not burn.
 
My own opinion is the cottage cheese on the ceiiling is to be avoided. Awful finish. In most areas it is not used in new houses anymore. I have a house full of it, you can scrape it off for me anytime you want.
 
IHC Red

OSB is really meant for exterior applications only, it's a bad idea to install it in confined areas such as garages or work shops, the fumes from the adhesives & formaldehyde are quite toxic.


Scott
 
OSB can be stood up the 9' direction with no issues. Most houses built now with 9' walls use osb in the vertical direction so as to not have to put in the shear blocking. I don't understand why put osb over drywall anyway.
Steven
 
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