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Reply by GregD

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Posted on Warped Plywood Cabinet Carcass - Help!

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GregD

788 posts in 3222 days


#1 posted 06-23-2016 06:56 PM


Well, plywood does bend and warp a bit. It is usually not a problem with plywood cabinets, because of the joinery that holds everything together. Rails and face frames ensure that everything is flat and square in the end.

I wouldn t mess with the water / sun business to flatten it. Just use joinery that forces is flat. I typically use dados and rabbets for the case, and attach the face frame with biscuits.

I guess if you were planning to build a frameless cabinet you would be in trouble, but with a faceframe I think you ll be fine.

- pintodeluxe

+1

Installation is another opportunity to pull things into (or out of) square.

There was a time it seemed that only the cheapest grades of plywood would curl like that. And then for a time I could find domestically produced plywood that rarely had that problem although at 1.5X to 2X the cost of the imported stuff. More recently I can’t find any plywood that doesn’t curl like that with some frequency. The problem seems to trace back to a ply layer where adjoining pieces overlap. Better to have voids, IMHO, but you typically don’t get a choice.

The bottom line is that the only way you can ensure that a plywood is going to be flat & square is to build it into a structure that forces it to be flat and square.

-- Greg D.


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