Walls and Ceilings - New Garage Ceiling and walls

I am a bit confused reading other peoples posts related to walls in a garage. What is the proper material to use for an attached garage? OSB, sheetrock or drywall? It looks like the wall on the house side is already drywalled(to meet fire code I guess). Does this mean I need to drywall the entire garage?

Also, need some advice on the attic space in the garage. Will 10 4x8 sheets of 7/16 OSB work or should I get 1/2 OSB? Do I put the OSB above or below the chords? I plan on drywalling the ceiling below the chords. Is this the best thing to do or do i need sheetrock?

Not sure what all the fuss is about sheetrock?? Why why would you put it in a garage? What are the pros and con? Is it needed for NFPA code?

Sheet rock is U.S.Gypsum's trademark name for - guess what - drywall. The drywall on the house side is fire rated. You can use regular dry wall for the rest of the garage if you want, or you could leave the studs exposed for an unfinished look. Personally I would go with 3/8 or 1/2 inch drywall for the walls and ceiling. 7/16 osb is only 1/16" less than 1/2". It should work fine for flooring a portion of the attic area for storage. From top to bottom, osb, 2x4's, then drywall on the garage side.

Sheet rock is U.S.Gypsum's trademark name for - guess what - drywall. .

Right, I was thinking about that stuff you use behind tile in the bathroom. Can't remember the name but it is like concrete. Does anyone use pegboard anymore?

Thanks Goldstar

"that stuff you use behind tile in the bathroom"

That would be cement board.

7/16" osb wouldn't be strong enough to walk on in the attic but would be ok for storage.
Some still use pegboard. Personally I like osb on the bottom half and pegboard on the top half of shop walls.