Reply by Lazyman

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Posted on Why did this Crack!!!

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4171 posts in 1946 days

#1 posted 02-05-2018 03:14 PM

Gluing it to the plywood probably caused it to crack rather than preventing it. The cherry will expand and contract across its width with changes in moisture. The PW will move almost none. The tangential shrinkage factor for cherry is about 7% which (I think) roughly equates to about .0023” movement for each 1% change in the moisture of the wood (if I am doing the math right). So if the wood was at say 15% moisture content when it was glued to the PW and when you brought inside and you turned on the heating and/or AC on it dropped to 12%, it wants shrink a little more than 1/16th of an inch for each 1 foot of width (there is very little movement in the length). So if you glue the cherry to an immovable surface, either the glue has to fail, which is unlikely if you glued and screwed it down well, or the wood has to split or buckle (depending upon which direction the moisture moves) to relieve the stress.

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.

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