With the adoption of 527 CMR 1.00, the Massachusetts Comprehensive Fire Code, in 2022, the 2022 Edition of NFPA 241 is now incorporated by reference in lieu of the previously referenced 2013 Edition. This updated edition of NFPA 241 includes two new chapters that provide rules and regulations specific to construction operations in Tall Mass Timber Wood Structures (Chapter 12) and Large Wood Frame Structures (Chapter 13). Both new chapters reference the need to conduct a study that is defined as a fire exposure analysis prior to the commencement of construction.
Sections 12.3 and 13.3 of NFPA 241 outline a fire exposure analysis, “Before construction begins, a study shall be conducted to ensure that the installation of passive and active fire protection systems, combined with the separation provided between other structures on the same or adjacent lots, are adequate to allow safe egress and to prevent fire spread to the exposed structures.”
Per NFPA 241, Section 13.1.2, and the Boston Fire Department, a large wood frame structure is defined as a wood structure that meets one of the following:
- Up to three stories and greater than 13,935 m2 (150,000 ft2) aggregate total floor area
- Over three stories, or over 12.2 m (40 ft) above the lowest level of fire department vehicular access, and greater than 4645.2 m2 (50,000 ft2) aggregate total floor area
Specifically, the Boston Fire Department has announced the expectation of a fire exposure analysis to be submitted along with an NFPA 241 Fire Prevention Program to their email alias for any new construction projects that meet the definition of a large wood frame building (bfd241@boston.gov).
The BFD Fire Exposure Analysis Guidelines are included via the following link: https://www.boston.gov/sites/default/files/file/2023/09/Fire%20Exposure%20Analysis_0.pdf
Are you doing work in Boston or other communities in the Commonwealth of Massachusetts and have questions about how this requirement may impact your project? Contact info@crcfire.com for additional information.