I am in the process of building a roughly 12' x 16' shed/workshop. It is going to be a pier-and-beam design. There are 8 concrete piers, 4 on each side, that will support 2 4x12 beams. The span from the outside of one of the beams to the outside of the other is roughly 12'.
One possibility for joist/subfloor design:
- 2x10 doug fir joists, 16" oc
- One blocking sequence down roughly the middle
- 3/4 inch plywood
- Some form of construction adhesive between joists and plywood
- Screwing and/or nailing plywood to joists.
I think it's a fairly sound design overall, but I'm not sure how much "give" there will be in the floor after completion. Do you think that would have a lot of bounce, or should that be plenty?
According to the IRC, both southern pine and doug-fir-larch should be able to span 12 ft for 40psf live load and 20 psf dead load at 16" oc. See: https://codes.iccsafe.org/content/IRC2015/chapter-5-floors?site_type=public .
Will this be sufficient to have a floor without significant bounce?