New Video: Torsion Box

Not a detailed how-to tutorial, just a quick check. We've heard they're rigid, and they FEEL rigid, but can we measure it?

https://youtu.be/2JkNi7jIkRE
I compared a very simple torsion box to a pine 2x10 by putting them across a 30" span (one at a time) with a dial indicator underneath, and stood right above the indicator.

Results? Torsion box deflected .03 inch, 2x10 deflected .1 inch. So yes, torsion box is nice & rigid.

In case it matters, the skin of the box is 1/2" plywood and the core grid is 3/4" plywood on 8" centers. The box was assembled with glue, plenty of clamps, and 16 gauge brads shot in with a pneumatic nailer.

I like torsion boxes.