I am planing a 12x18 screen porch addition with double 2x8 band joists. I want to notch the outside top of the 6X6 posts to accept the double joists flush. I understand this is the strongest way and I really lihe the appearence. However, if I notch the corner posts to accept the front and side joists there will only be a 2.5" square stub left to bolt through. Is this acceptable? What are some alternatives? Any suggestions will be greatly appreciated.
That will work fine. Done all the time, most of the force is straight down.
Just double bolt it with 1/2" carrage bolts.
I counter bore the area where the heads of the bolts are so I can cover the rim joist with composit fashia so it's a nice clean look.
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I typically notch the 6x6 for a single ply then attach the outer ply to it. I'll then attach a wood cleat to the column under the outer ply. This satisfies the code requirements of beams, girders and joists bearing on 1-1/2" of wood. Once the ply is installed in the notch I use a metal strap tie that attaches to the column above and below the notch.
"You get what you pay for, and sometimes free costs more!"
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