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I am in the process of finishing my garage. Common walls with the house have two layers of drywall: ~1/2" and 5/8". Is there a cheap and aesthetically pleasing way to transition to one layer of 5/8" for the remainder of the wall or will the whole wall have to be 1-1/8" thick? I could install OSB behind the drywall which would be nice for hanging stuff; however, it's pretty expensive right now.two layers of drywall

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    Why not just rip the 1/2" OSB into 1-1/2 wide strips to use as shims, and attach them to the edge of the wall studs? – SteveSh Jan 7 at 0:44
  • @Tag- I'm not quiet positive on this, but the thickness on the common wall may be due to a fire rating code requiring a certain thickness. Maybe some one else will ring in. Just tossing suggestions out. – ojait Jan 7 at 3:25
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    @ojait, I don't think OP is planning to remove the existing fire rated wall, but is trying to match the surface level on an adjoining part of the same wall that is not "common" to both the garage and house... at least that's how I read the question. Good to bring up the fire rating requirement though. – Jimmy Fix-it Jan 7 at 6:02
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Why not just rip the 1/2" OSB into 1-1/2 wide strips to use as shims, and attach them to the edge of the wall studs?

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  • This ended up working great. If I had known how much time it was going to take to rip and install ~100' of OSB I'd have paid to use full sheets. With that being said I learned a lot and am pretty happy with the result. Thank you! – Tag Jan 12 at 15:18

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