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.

Maple and Birch

I tend to think of maple and birch as the same color, but here they are side by side, red maple and white birch, unretouched, no filters, side by side in the light of a July afternoon in Wisconsin.