Posted By cmkavala on 07/13/2008 9:51 AM
Ratman;
regardless of system you will need a center bearing beam. I don't think 6" - OSB wiil make it 14 ft.,
6" steel will with a 35 lb. load @ L /240 or 8" steel will go 14 ft. with 45 lb. load @ L /240 and an underlayment is advisable.
Steel is also available in one 28 ft. piece
He mentioned that he's using 2x10 floor joists 24" OC, and therefore not relying on the structural capacity of the SIPs at all (except to span 24" -- not really a challenge). Although, I don't think 2x10's can span 28ft? He said he had engineered it as if it were a conventional floor, though, so perhaps he already has a midspan support in there.