For this house it will be a 2x6 exterior wall with 2" of extruded polystyrene outside.
I have been thinking about trying 24" centers on exterior walls with a single top plate, for a house coming up this spring. This house is going to be a high efficient house, as like all the houses we build. So I am trying to come up with as many ideas to eliminate thermal bridges as possible.
It meets code, and if the trusses land on studs, I see nothing wrong with it.
I was thinking if we do this, 1/2" SR would be better for the drywall.
I have also heard you can build a stronger floor with 24" centers and 1.25" plywood than 16" centers and 5/8" plywood.
Just looking for some input from you guys.
A single top plate usually means you need a gusset to connect 2 pieces together on a long wall. Not unusual, but definitely not common.
1/2" sheetrock as opposed to....what? Do you use anything other than 1/2" sheetrock? I think it would be spongy unless you use ceiling board or 5/8". Just my opinion.
Usually the ply is 1-1/8" and it should be fine. Span ratings for that usually say you can go 4' centers which sounds absurd to me, but again, I'm sure it's done. I used 1-1/8" DFir once before and that was one solid floor.
If it is a exterior-wall-bearing, double-exterior-wall house. That would be an R50 wall (leave 5.5" space between the walls.