Anyone seen data on maximizing the holding power of large lag screws in wood??
I'm using several different sizes/lengths on a post-beam barn I'm building. I WISH I knew stuff like:
(1) What's the best diameter and depth (vs total penetration) for pilot holes in various woods?? Example: I have 1/2" dia lagscrews that penetrate 4 inches into hemlock. My guess: 5/16" pilot, um, 2 inches deep.
(2) What's the right torque for best holding without getting near the tearout/stripping point? My guess: What 'feels right' now.
(3) What's a reasonable side (shear) load for, um, 2" thick hemlock with a 1/2" lag screw?? I've heard of anti-creep washers / strips used in high sheer loading applications. Anyone know about them?
And pointer, suggestions appreciated! Some midwest barn-building Ag students must have figured this out, but I can't find it...