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Jimmy---you have to remember 2x4s are pretty much for rough work, so agree with Dr. Buckle---I think you'd find lap joint, with glue and screws your best bet. Made a couple of gates for the yard that way and they've held up great.
Biscuits are great for aligning face surfaces. My opinion is they dont add to the strength of a joint. Better with mortise and tenon, or a half lap joint. Depends on the application and what its for. Just MHO
<a href=\"http://www.woodshopphotos.com/gallery/Ralphs-workshop\" target=\"_blank\">www.woodshopphotos.com/gallery/Ralphs-workshop</a><br /><br />I can fix anything......where\'s the duct tape ?? :-)
If you're building a rectangular frame, it not only needs to support tension and compression, but just as importantly, it should support torsion, aka torque, aka racking forces. Adding a diagonal member across the rectangle will all but eliminate racking, whereas the nicest joints at the rectangle corners will do very little in comparison. Adding a panel to the face of the rectangle can provide support similar to a diagonal member.
I use a Kreg jig and love it. It can pocket hole 1/2-1 1/2 " wood. Fast,easy,accurate and stong. I use kiln dried 2x4 and am very selective at the store for which ones to buy. That can take a while. By the way I almost never use my biscuit jointer anymore, Kreg claims that their joint is as strong as a mortise. I am inclined to believe it.