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How to straighten AC plywood for desktop

Woodworking Asked by zwiebelspaetzle on August 30, 2021

I’m building a very simple work-from-home desk, with 3/4" AC fir plywood for the top. The plywood has a concave bow on the top side. How do I straighten this board?

Other details:

  • I’ve already applied several coats of polyurethane to the top–perhaps this was a noob mistake to do before straightening.
  • I’m planning to use sawhorses as legs, and screw a 2×4 lengthwise to the bottom of the desktop for rigidity.
  • Desktop is 72"x24".
  • I didn’t finish the bottom. Do I need to do this for moisture reasons?

One Answer

Plywood is difficult to straighten; it is full of glued together plys.

  • You could glue/screw another warped piece with opposing curves to it.
  • Screw/glue straight runners to the underside. 2x4's, angle iron, etc.

Answered by Alaska Man on August 30, 2021

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