Code of Massachusetts Regulations
780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS
Chapter 4 - Special Detailed Requirements Based on Use and Occupancy
Section 412 - AIRCRAFT-RELATED OCCUPANCIES
Subsection 412.5 - Residential aircraft hangars
Current through Register 1531, September 27, 2024
Residential aircraft hangars as defined in Section 412.2 shall comply with Sections 412.5.1 through 412.5.5.
412.5.1 Fire separation. A hangar shall not be attached to a dwelling unless separated by a fire barrier having a fire-resistance rating of not less than 1 hour. Such separation shall be continuous from the foundation to the underside of the roof and unpierced except for doors leading to the dwelling unit. Doors into the dwelling unit must be equipped with self-closing devices and conform to the requirements of Section 715 with at least a 4-inch (102 mm) noncombustible raised sill. Openings from a hanger directly into a room used for sleeping purposes shall not be permitted.
412.5.2 Egress. A hangar shall provide two means of egress. One of the doors into the dwelling shall be considered as meeting only one of the two means of egress.
412.5.3 Smoke alarms. Smoke alarms shall be provided within the hangar in accordance with Section 907.2.21. [F]
412.5.4 Independent systems. Electrical, mechanical and plumbing drain, waste and vent (DWV) systems installed within the hangar shall be independent of the systems installed within the dwelling. Building sewer lines shall be permitted to be connected outside the structures.
Exception: Smoke detector wiring and feed for electrical subpanels in the hangar.
412.5.5 Height and area limits. Residential aircraft hangars shall not exceed 2,000 square feet (186 m2) in area and 20 feet (6096 mm) in building height.
