I am going to build built-in seating for my dining room. Planning a 6' span and a 5' span in an "L" shape in one corner of my dining room. I have a decent plan in mind, but I am not sure how to decide how to space the supports. I plan to have the cushions removable and a small (18" to 24") hinged lid on each seat for bonus storage (board games, etc).
Frame will be 20" wide, 14" tall at seat, and (24") between spans. Back will go up from seat area ~3" from back to give it a slight lean using angled cut on 30" high back.
A good rule of thumb for distance between support studs in a banquette seat
built-ins
Best Answer
With 3/4" plywood you won't need crossbars for a span of up to about 24" (similar to a typical new home's subfloor arrangement). Beyond that it may start to get bouncy.
In the bizarre case where you'd have a very deep seat, you'd want crossbars at 16-24" intervals.