Effectively addressing the genuine fire hazards associated with large wood building construction is a critical part of project planning. For jurisdictions adopting NFPA 241 (2019 and 2022 editions), a completed fire exposure analysis should be provided along with the balance of the project’s Construction Documents.
Specifically, NFPA 241 Section 12.3 (2019 edition) and NFPA 241 Sections 12.3 and 13.3 (2022 edition) states: “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 the 2022 edition of NFPA 241, a large wood-frame structure is defined as a wood structure that meets one of the following criteria:
• Up to three stories and greater than 150,000 sq ft (13,935 m2) aggregate total floor area
• Over three stories, or over 40 ft (12.2 m) above the lowest level of fire department vehicular access, and greater than 50,000 sq ft (4645.2 m2) aggregate total floor area.
The fire exposure analysis should not just be viewed just as a box to check to secure a permit; rather, it is an essential tool intended to mitigate real construction fire risks, such as rapid fire spread, compromised egress routes, and greater exposure hazards for adjacent structures. By thoroughly evaluating fire risks unique to large wood-frame projects and implementing tailored strategies, project teams and the responding fire departments can better safeguard construction sites and protect the surrounding community.
The expectation of NFPA 241 is that this fire exposure analysis, along with a project-specific Fire Prevention Program, is submitted to the Authority Having Jurisdiction at the time of permit submission.
Are you doing work with wood-frame construction and have questions about how this requirement may impact your project? Contact info@crcfire.com for additional information.