After a couple months of acclimating, I surfaced the 12/4 ash board which will form the rest of the benchtop. It had almost no twist, but even with a bit of cup, I still ended up with over 3″ of total thickness. But as you’ve probably observed, that’s still about 1″ thinner than the main benchtop.
I have a solution, though. Some Douglas Fir spacers will raise the back board up to the same height as the rest of the benchtop. A little higher, actually, so I can plane everything into flatness. I used DF because while it will ding and mildly conform to any irregularities, it’s still tough and rigid. Eastern White Pine would compress too much over time, methinks.
I plan to glue the back board to the main benchtop, so here is the question: do I glue the spacers to the back board, or just screw them on (so I can replace them later)? In any event, I want to add some alignment dowels into the short stretchers that will keep everything in order.
I have a process for that, which I’ll detail in the next post.