I've done wide, multi board, glue ups in the past, just not 5' long. I've also done long glue ups made up of three parts totaling 17" wide. In both cases I used biscuits (#20s) and TBII. I prefer to not do the glue up with multiple joins and do one joint at a time. I know, it takes longer, but I prefer it for easier control of the clamping and handling squeeze out. My clamps are 3/4" Pony clamps, so things can get heavy with a long work piece. I would think that a single row of biscuits should suffice. Back in the early days of biscuitry, folks were havig some issues with "shadowing" from puttîng the bisxuits too close to the surface. The biscuits and surrounding wood expand from the moisture in the glue and you have football shaped areas on the surface. I you sand the surface before the moisture leaves the wood, you can end up with football shaped depressions.
I've gone out to find myself. If I return before I get back, have me wait for me.
"Sawdust is Man Glitter"
Last edited by Jim Frye; 01-23-2018 at 08:28 PM.
Reason: added blather