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Drum sander marks in a freshly laid/finished 3/4 oak floor. I gave the sub a chance to resand and finish but highly visable sanding marks remain. The installer is now claiming that deflection in the sub floor and joist is causing his machine to bounce and that the problem is mine.
The floor is built as follows. 2x10 joists 16" on center, 11' span, x brasing, 3/4" cdx T&G sub floor. As far as I'm concerned If there is any
bounce in the floor, and there isn't, it's besides the point. He accepted the sub floor as adequate when he put down the firs plank.
Any one know what is causing the sanding marks?
I gave him a chance to fix the problem and he failed, should I tell him to take a hike?