Reply by GregD

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Posted on Flatness of double-layer MDF vs. torsion box

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788 posts in 3163 days

#1 posted 11-09-2011 06:32 AM

What is a torsion box that doesn’t have the bottom skin? That is what I do. Simple torsion boxes are actually pretty easy to make with pocket hole screws, especially if you leave off the bottom skin. If you can rip straight and parallel you can get good results. But you do use up plenty of screws. I prefer 3/4” plywood because it is lighter and tougher, and the torsion box frame is sufficient to pull it flat. Extend the top 3” or so beyond the frame if you want to have easy clamping. Don’t use glue (and leave off the bottom skin) and it is easy to go back and shim the low spots if they annoy you (now or later).

-- Greg D.

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