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I've recently built an addition and over ordered sub floor so the result is I have enough sub floor (3/4" tongue and groove OSB) to do a good amount of exterior sheathing.

My question however, should I? Are there consequences other than the sheer cost of the lumber to actually using this heavy grade of OSB on a 2x4 exterior wall or will it just produce a tighter, more insulated wall?

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Structurally, it's not a problem. If there are windows, you may need bigger trim (surround) by 1/4". (By the way, most residential walls need to be 2x6 construction due to the energy code.)

  • Door jambs will be too shallow, also. I'd sell it on your local trader website and use 7/16. – isherwood Aug 8 '17 at 15:40

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