: A minimum K-factor of 11.2 is now required for OH-2 and higher hazards.
: For professionals needing deeper context, the NFPA 13 Handbook includes the full text of the standard plus expert commentary and diagrams. Key Updates in the 2025 Edition
: Systems must be designed to ensure they effectively control or extinguish fires to protect lives and property.
: New protection options and criteria have been added for sloped ceilings in both storage and non-storage settings. Core Requirements
: Plans submitted to local jurisdictions generally require detailed worksheets and computer-generated hydraulic calculations as specified by NFPA 13. Nfpa 13 Handbook - sciphilconf.berkeley.edu
: For ceilings over 30 feet, sidewall sprinklers are no longer permitted in Ordinary Hazard (OH-1) or higher occupancies.
The official standard for installing sprinkler systems is , published by the National Fire Protection Association (NFPA) . As of April 2026, the 2025 Edition is the most current version, though older versions like the 2019 and 2022 editions remain in use depending on local building codes. How to Access NFPA 13