Bob, the way Florida works is kind of funny .. the code spells out specifically the requirements to meet the building code .. i.e. nailing schedules, lumber sizes, specifications, spanning tables, etc ... but other portions of the code specifically require that an engineer or architect place a raised seal on all plans for construction. More and more though the FBC and FRC have been moving to a reference code, meaning that instead of telling you that you must do "this" and "this", it tells you that you must do "this, according to <insert other reference material here>" So for example, in the roofing section, while it does prescribe some things, it also states that the roofing must comply with NRCA ...