Is stucco finish practical on advanced framing?
Is there a way to make 1″ stucco over 1/2″ plywood a good assembly over 24″ c-c 2×6 framing? I have designed a 2 level house with the idea that advanced framing (24″ c-c, single top plate, minimal studs) will improve energy efficiency (the energy calculations show that to be true), but my conversation with the lath and plastering industry rep indicates a plaster sub might refuse the job because of concern over excessive deflection from wind (>1/360 of span), and also I find that UBC generally only fire-rates plaster on 16″ c-c spaced studs (this project does not require a rating, but it could be an indicator of reasonable limits). I am having second thoughts about advanced framing, even after having argued long and hard with the GC.
We are using engineered lumber LVL’s for the studs because of wind load on some walls roughly 10′ high. The wind is not extreme; we are in a high seismic risk zone in California.
Is this an instance when advanced framing is a bad idea?