Reading a post by pyramidappr had me thinking about a joint that I saw detailed out awhile ago that had me scratching my head.... it's a frame made out of HSS8x8x5/8. Let me see if I can attach a sketch. I don't know what to call the joint....it's not a BTC-P10 as it has backing and a 1/4" root opening
I don't see a D1.1 figure 3.2 pre qual detail for this configuration, which IMHO, should have been included. Another way D1.1 fails to fully account for flare groove joints...