At home right now, don't have the codes in front of me, I thought the IRC specified the within 15' of any sleeping room. At the very least, enforce the State law of within 15' of any sleeping room, in ALL R occupancies. As far as why they are not in the IBC, different code change committees, may not have been submitted yet, and even if it were, the committees don't always play nice with each other, as in aligning the codes with each other. We'll see what happens for the 2015 cycle.