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We have made a 87" x 40" table our of 1" red oak boards. Each end has an approx. 8" wide breadboard, which of course runs perpendicular to the grain of the 70" long boards that run lengthwise on the table top. We affixed the breadboards by gluing them on the end of the table and gluing and screwing a 1/2" thick by 6" wide piece of oak plywood across the underside of the joint, out to about 6" from the edge of the table on each side.
Our customer's home has been humid for the last few months since delivery. The breadboards have expanded lengthwise about 1/16"-1/18", making them slightly wider than the table right now (which is not a major issue. However, one breadboard has warped a little and come up slightly at the joint near the outside of the table. We have agreed to repair.
I was thinking that we would cut the breadboard off, then cut a 1/4" slot or groove into the edge of the breadboard and a 1/4" deep slot or groove into the edge of the table end, and place a plywood "bisquit" in during the gluing process to help ensure that even if the breadboard moves again, it will not cause the joint to become uneven.
I hope I have not confused anyone.
My question is, does anyone have a recommendation on the best way to join breadboards to the ends of tables so that the joints will remain even across the top of the table even when the wood moves? Does anyone have a better suggestion on how to repair the current problem? Thanks for any help.
Our customer's home has been humid for the last few months since delivery. The breadboards have expanded lengthwise about 1/16"-1/18", making them slightly wider than the table right now (which is not a major issue. However, one breadboard has warped a little and come up slightly at the joint near the outside of the table. We have agreed to repair.

I was thinking that we would cut the breadboard off, then cut a 1/4" slot or groove into the edge of the breadboard and a 1/4" deep slot or groove into the edge of the table end, and place a plywood "bisquit" in during the gluing process to help ensure that even if the breadboard moves again, it will not cause the joint to become uneven.
I hope I have not confused anyone.
My question is, does anyone have a recommendation on the best way to join breadboards to the ends of tables so that the joints will remain even across the top of the table even when the wood moves? Does anyone have a better suggestion on how to repair the current problem? Thanks for any help.