Three story apartment building, Type VB construction.
The NFPA-13R sprinkler system.
An architect who reads 903.3.1.2 to say that the 13R residential sprinkler system is an equal substitute for a NFPA13 system only in R occupancies of four stories or less.
Now I have read IBC 504.2 several times over and my interpretation is that both height and area increases are allowed for the full NFPA-13 sprinkler system. But the 13R sprinkler system is good for only the height increase.
Would you concur with my interpretation that the 13R system does not allow for area increase?