Construction Type: 5B
(It's a 960 sf 2nd floor residence constructed over a 3-car garage below.)
The structure is within a floodplain.
We are providing the required occupancy separation between the garage and the residence above w/ 5/8" type "x" gyp. bd.
Our problem is this:
How do we provide the required 1-hour protection for the members suppoting the protected floor/ceiling assembly? (Gypsum board products are not allowed below the flood plain.)
Because we are also providing an automatic fire sprinkler system throughout, shouldn't that be an an acceptable substitute for the required 1-hr protection of the supporting members?
Footnote "e" from CBC's table 601 suggests fire sprinklers are an acceptable alternative to the 1-hour requirement but the building official won't bite.