Bought a house 5 years ago. Brick construction, single story with full basement (concrete walls). The attic was converted to living space (with permit) before I bought it, but it has 43-inch knee walls and only 6 ft headroom for about 8 feet of width. Virtually no closet space
the fact it was converted with permit presumably means that the foundations are strong enough to support true second floor. Was going to dormer it entire length, but exterior material costs are only about $5K more to replace roof and build 8 foot walls all round. So it seems like a no-brainer. I built my own 22 x 24ft garage with truss roof (had to register as GC to get permits), so it's pretty much same thing but 40-foot long and 12 feet higher :-)
Anyway, I know the architect/structural engineer will provide all this detail, but that's gonna take some time, so would like to get an idea sooner about 2 things I'm puzzled about.
- The trusses need to be 24-inch on center. When i built garage I put extra studs under truss locations to carry load to slab. I'm not opening up first floor walls, so should I just space trusses at 16-inch so they are over the studs?
- Normally, in 2-story framing, the floor joists for 2nd floor are square at the ends like diagram below. But as my roof goes all the way to the floor level on second floor (and it's 12/12 pitch), the joists are cut at 45-degrees.
So how would I support the new 2nd floor walls?
Can I just put blocking between the joists that gives me a continuous area (except the 45-degree cutout) for the new bottom plate
Can cut a 90-degree notch wide enough for a 2x4 bottom plate?