knee brace size and tenon question

[windfall]

Hello, I'm using doug fir 3x8 brace stock.  I would like to put a 2 inch tenon (width) with a one inch shoulder, 3 inch deep with a 1/2 inch housing.   These would be offset from the reference face.   I noticed the tenon size and shoulder are usually 1 1/2 inch each (split equally).  Also is the one inch of wood left for the shoulder and pegging enough? thankyou

[timberwrestler]

As long as you're not taking too much meat out of the corresponding piece with the mortise, then that will work.  As a very rough guideline, the mortise width would be 1/4 of the timber width.

[windfall]

okay thanks...I guess I forgot to state the post dimensions...8x10 so plenty of room overall on the ratio basis, was just wondering if an inch of shoulder was enough? as Id rather do 2 inch tenon than the standard 1 1/2 for a 3 inch thick material. thankyou

[Brad_bb]

I started out cutting 3" brace stock but quickly changed to 4" Thick.  Split one of the brace tenons driving the peg.  You want 2 shoulder on a 2"  tenon. Use 4x8 brace stock.  You can cut a curve in it or don't depending on your taste.

[windfall]

Darn...I was afraid I'd hear that.  Makes sence...I was just trying to use what I had available.  Thanks for the advice!