Reply by clin

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Posted on Expansion and Contraction..Am I thinking correctly

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1076 posts in 1602 days

#1 posted 02-09-2017 11:53 PM

Clin – Yes, that is what I was trying to show with my crude drawing. Thanks for clarifying it!

Since this would be happening at a miter joint, the effect would be doubled.

- ChuckV

Yes, doubled and over a 25” width, even a really small percentage expansion would result in a significant gap.

Of course it still comes down to just how much the wood will actually expand in the environment it is in and conditions. But kitchen counters get wiped down, have spills, and are exposed to humidity from things like dishwashers and sinks. So it would likely be worse than what a piece of indoor furniture is exposed to.

And no amount of gluing or trying to hold it in place works with large pieces of solid wood. If you can hold it still, it just permanently crushes itself when it expands. Then when it shrinks back, the wood splits.

Even just gluing down one side of a board, won’t control what the other side does. Wood’s going to move.

If not already mentioned, this would be an application where both sides of the wood need to be sealed to reduce cupping.

-- Clin

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