Reply by sawdustdad

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Posted on Expansion and Contraction..Am I thinking correctly

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379 posts in 1495 days

#1 posted 02-10-2017 07:16 PM

The critical thing here, IMHO is that with wood movement, the miter angle will change—so the attachment system needs to allow at least one leg to “swing” to accommodate.

Countertop bolts will keep the miter tight, but movement still needs to be accommodated.

- jerryminer

This is correct. The miter will open up. It’s wood. That what it does. I would veneer a plywood or MDO substrate. There is no practical way to keep the miter tight and the counter tops in place. If you bolt the miter together, and don’t let one leg swing, the top(s) will crack. flat sawn walnut will shrink and expand up to 1/4 inch across the 25 inch wide surface. The swing at the end of a 6 foot counter run would be about an inch. Veneer is your friend in this case.

-- Murphy's Carpentry Corollary #3: Half of all boards cut to a specific length will be too short.

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