In looking through the 2009 IRC for duplexes, the only requirements that I find are as follows:
One hour wall separation from foundation to underside of roof (R302.3).
Penetrations through rated walls have size limitations and require a rated fire stop system (R302.4.1).
Membrane penetrations require boxes listed for fire rated assemblies and shall be separated from boxes on the other side of the wall by the listed methods (R302.4.2).
Am I missing anything?
One hour wall separation from foundation to underside of roof (R302.3).
Penetrations through rated walls have size limitations and require a rated fire stop system (R302.4.1).
Membrane penetrations require boxes listed for fire rated assemblies and shall be separated from boxes on the other side of the wall by the listed methods (R302.4.2).
Am I missing anything?