Reply by Kazooman

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Posted on Expansion and Contraction..Am I thinking correctly

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1408 posts in 2559 days

#1 posted 02-09-2017 09:33 PM

I’ve certainly never done this, but I think it may be a problem. As either piece expands along its considerable width the portion at the miter is bearing against the end grain of the other piece. I don’t see how it can move freely without opening up the joint at the rear. On the other hand, if the pieces are contracting they would pull away from each other and just open up the entire joint unless the entire top is allowed to float freely.

On second thought, I think that it might work as long as the entire top is allowed to move. We normally don’t worry about expansion with the grain, but here the cross grain expansion of one piece will be transferred along the length of the other. Allowing the top to move lengthwise and not just across the grain might be critical.

I think I need to go build a mock up and dump some water on it.

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