I just went through that tearing out the whole house including sheetrock. Subfloor was the worst with those damn ring-shanked nails. Not only that but the den floor had a 1/2 inch hump running down the middle where the triple girder sits on concrete pier. No way to lower it other than shave it down....along with all the floor joists in proximity connected to it. Electric hand plane and probably around 12 hours of work including the tear out, shave down, insulation work, and putting the subfloor back. Used an electric hand plane - $79 at lowes. Had quoted the job with someone and it was going to be a few grand but the guy ghosted me. He saved me quite a bit of dough.
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1994 Wellcraft V21
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