Mich. Admin. Code R. 408.30539a - [Effective 8/29/2025] Automatic fire sprinkler systems

Rule 539a. Sections R313.1, R313.2, P2902.5.4 and P2904.1 of the code are amended to read as follows:

R313.1. Townhouse automatic fire sprinkler systems. An automatic sprinkler system may be installed in townhouses.

Exception: an automatic sprinkler system may not be required where additions or alternations are made to existing townhouses that do not have an automatic sprinkler system installed.

R313.2. One-and two-family dwellings automatic sprinkler system. An automatic sprinkler system may be installed in one-and two-family dwellings.

Exception: An automatic sprinkler system may not be required for additions or alterations to existing buildings that are not already provided with a sprinkler system.

P2902.5.4. Connections to automatic fire sprinkler systems. The potable water supply to automatic fire sprinkler systems shall be protected against backflow by a double check-valve assembly or a reduced pressure principle backflow preventer.

Exception: Isolation of the water distribution system is not required for deluge, preaction, or dry pipe system.

P2904.1. General. Where installed, residential fire sprinkler systems, or portions thereof, shall be in accordance with NFPA 13D.

Notes

Mich. Admin. Code R. 408.30539a

2010 AACS; 2025 MR 10, Eff. 8/29/2025