My $40 butcher block top warped after one humid week in Nashville

I grabbed a cheap birch block from a local lumber yard last month, sealed it with three coats of poly, and thought I was set. Then we hit a week of 90% humidity and the edge lifted a good quarter inch off my frame. I'm guessing I didn't let the sealer cure long enough between coats, but has anyone else had luck with a different finish or a metal C-channel to keep these budget tops flat?

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finley_lane6219d ago

Yeah, the poly wasn't dry all the way through, that's the classic move.