In flood hazard areas, if all proposed work, including repairs, work required because of a change of occupancy, and alterations, constitutes substantial improvement, then the existing building shall comply with Section 1612 of the International Building Code.
Exception: If an historic building will continue to be an historic building after the proposed work is completed, then the proposed work is not considered a substantial improvement. For the purposes of this exception, an historic building is:
1. Listed or preliminarily determined to be eligible for listing in the National Register of Historic Places;
2. Determined by the Secretary of the U.S. Department of Interior to contribute to the historical significance of a registered historic district or a district preliminarily determined to qualify as a historic district; or
3. Designated as historic under a state or local historic preservation program that is approved by the Department of Interior.
Replacement of existing or missing features using original materials shall be permitted. Partial replacement for repairs that match the original in configuration, height, and size shall be permitted. Such replacements shall not be required to meet the materials and methods requirements of Section 501.2.
- Floors below the First Story. Not more than one occupant per 100 square feet of gross floor area with a maximum occupancy of 49.
- First Story. Not more than one occupant per 50 square feet of gross floor area.
- Second Story and Above. Not more than one occupant per 100 square feet of gross floor area, or 30 occupants per 22 inch unit of egress width, whichever condition results in the lesser occupancy load.
Every historical building that cannot be made to conform to the construction requirements specified in the International Building Code for the occupancy or use and that constitutes a distinct fire hazard shall be deemed to be in compliance if provided with an approved automatic fire-extinguishing system.
Exception: When the code official approves an alternative life-safety system.
- Manual Fire Extinguishing Equipment. All use groups, other than R-3 and R-4, shall have approved manual fire extinguishing equipment, as determined by the head of the local fire department.
- Fire Alarm Systems. Use groups R-1, R-2 and R-3 shall conform to the
requirements of section 907 of the International Building Code 2009 with Massachusetts
Amendments (780 CMR 907), as applicable. All other use groups shall comply with
section 1103.12 items 2.(a) and (b) of the International Building Code 2009 with
Massachusetts Amendments (780 CMR 1103.12 items 2.(a) and (b)).
3. Manual Pull Stations. A manual fire alarm pull station shall be provided in the
natural path of egress in all use groups except R-3 and R-4. Manual pull stations shall
be connected to the building fire warning system in conformance with NFPA 72.
- Locations. Provide smoke detectors in accordance with manufacturers listing and spacing requirements, but not less than one, for every 1200 square feet of floor area per level. In addition, all lobbies, common corridors, hallways and exitway access and discharge routes shall be provided with approved smoke detectors installed in accordance with the manufacturers listing and spacing requirements but not more than 30 feet spacing between detectors. All required smoke detectors shall have an alarm audible throughout the structure or building.
- Single Station and Multiple Station Smoke Detection Devices. As required by Chapter 9 of the International Building Code 2009 with Massachusetts Amendments (780 CMR 9.00).
At least one main entrance shall be accessible.
1. If a main entrance cannot be made accessible, an accessible nonpublic entrance that is unlocked while the building is occupied shall be provided; or
2. If a main entrance cannot be made accessible, a locked accessible entrance with a notification system or remote monitoring shall be provided.
In corridor walls required by these provisions to be fire-resistance rated, existing transoms may be maintained if fixed in the closed position, and fixed wired glass set in a steel frame or other approved glazing shall be installed on one side of the transom.
Exception: Transoms conforming to Section 1103.4 shall be accepted.
Where interior finish materials are required to have a flame spread index of Class C or better, existing nonconforming materials shall be surfaced with approved fire-retardant paint or finish.
Exception: Existing nonconforming materials need not be surfaced with an approved fire-retardant paint or finish where the building is equipped throughout with an automatic fire-suppression system installed in accordance with the International Building Code and the nonconforming materials can be substantiated as being historic in character.
Existing stairways shall comply with the requirements of these provisions. The code official shall grant alternatives for stairways and railings if alternative stairways are found to be acceptable or are judged to meet the intent of these provisions. Existing stairways shall comply with Section 1103.
Exception: For buildings less than 3,000 square feet (279 m2), existing conditions are permitted to remain at all stairs and rails.
- The building official shall be authorized to accept existing floors and approve operational controls that limit the live load on any such floor.
- House museums need not comply with the wind load and seismic load requirements of this code.