The Hiawatha Building Code is hereby amended by repealing Section R313 of the International Residential Code, and by replacing said section with a new section as follows:
SECTION R313 AUTOMATIC FIRE SPRINKLER SYSTEMS
R313.1 Townhouse automatic fire sprinkler systems. An automatic residential fire sprinkler system shall be installed throughout all attached townhouse dwelling units when any of the following conditions exist:
1. The townhouses are constructed in a group of more than four attached units.
2. Any individual townhouse dwelling unit of a structure with four or fewer attached townhouses has a floor area greater than 4000 square feet on any one story or greater than 8000 square feet of total floor area for all stories, excluding non-habitable areas separated from the rest of the building by a minimum of one-hour fire-resistive construction and containing smoke or heat detection interconnected with the dwelling unit smoke detectors.
3. The floor area of the structure, excluding the basement, exceeds 10,000 square feet regardless of fire separations creating separate buildings, fire areas or occupancies.
Exception: An automatic residential fire sprinkler system shall not be required when additions or alterations are made to existing townhouses that do not have an automatic residential fire sprinkler system installed.
R313.1.1 Design and installation. Automatic residential fire sprinkler systems for townhouses shall be designed and installed in accordance with NFPA 13D or Section P2904.
R313.2 One- and two-family dwellings automatic fire sprinkler systems. An automatic residential fire sprinkler system shall be installed in one- and two-family dwellings when the following conditions exist:
1. The one- or two-family dwelling has a floor area greater than 4,000 square feet on any one story or greater than 8,000 square feet of total floor area for all stories, excluding non-habitable areas separated from the rest of the building by a minimum of one-hour fire-resistive construction and containing smoke or heat detection interconnected with the dwelling unit smoke detectors.
2. The floor area of the structure, excluding the basement, exceeds 10,000 square feet regardless of fire separations creating separate buildings, fire areas or occupancies.
Exception: Two-family homes separated as required for a townhouse shall have automatic fire sprinkler requirements as for townhouses.
Exception: An automatic residential fire sprinkler system shall not be required when additions or alterations are made to existing one- and two-family dwellings that do not have an automatic residential fire sprinkler system installed.
R313.2.1 Design and installation. Automatic residential fire sprinkler systems for one- and two-family dwellings shall be designed and installed in accordance with NFPA 13D or Section P2904.