Advanced Framing, 16-ft. tall wall
Let me preface by saying I’m not a professional home-builder, rather an owner-builder in the design phase of my first (and likely only) house that I’ll be building. I have gained a lot of information on this site and I appreciate it, as well as the contributors very much.
The design will be going to engineering very soon, but I’d like to prepare for the likely framing requirements regarding a 16′ tall wall planned in the living room. The house will be primarily framed 24″ oc with 2×6’s. Most of it will be 2-story, with the exception of the living room which will be open. 16′ tall walls with vaulted parallel chord trusses (16′ span to outside of exterior walls). Total living room is 16’x18′ (to exterior of walls).
Gable end (16′) will have bigger windows, but side walls (18′) will have windows fitting within 24″ oc studs so their won’t be any breaks in the framing. Collar ties are spaced every 6 ft which will be wrapped in wood veneer for an exposed timber look. Sheathing will be structural 1″ rigid foam (Ox SIS, previously Dow), followed by 3/8″ rain screen, followed by 19/32″ LP Smartside panels (also structural) for board batten.
I know 24″ oc 2×6 is not enough structurally. I’m wondering what to expect would be? Would double 2×6 do it, sistered or spaced 12″ oc? How about single 2x8s? Or alternately, would staggering 2×4’s 24″ oc offer the same structurally as 2×8’s? I plan on mineral batt insulation. Because of the relatively small space, cutting custom sized batting isn’t a dealbreaker, just less than ideal.
Thanks in advance for your help.