On Sat, 19 Jul 2008 14:01:44 -0700, "Eigenvector"
wrote:

Well in this case I'm installing a 1/2" stiffener board to the backside of a
1" plank surface.

For that scenario, I'd probably use a #8 1-1/4 or 1-3/8 through the
stiffener into the plank. Flat head countersunk if I needed the head
to be flush.

Tom Veatch
Wichita, KS
USA