Section 8.5.1/Sprinkler Spacing (2019 Edition)
NFPA 13 2019 Section 8.5.1 covers sprinkler spacing and coverage area, the edition referenced by IBC 2021.
Standard spray sprinklers must be spaced so that the maximum protection area per sprinkler does not exceed the values in Table 8.5.2.1 based on the hazard classification and construction type. For light hazard smooth ceilings, the maximum area per sprinkler is 225 square feet with a maximum spacing of 15 feet. For ordinary hazard, the maximum area is 130 square feet. The minimum spacing between sprinklers is 6 feet (to prevent cold-soldering where an adjacent sprinkler's discharge cools the operating element of a nearby sprinkler). These requirements are the same in both the 2019 and 2022 editions.
Key differences from NFPA 13 2022
The sprinkler spacing requirements in Section 8.5 are largely unchanged between the 2019 and 2022 editions. The significant changes in the 2022 edition are in other chapters: revised obstruction rules in Section 8.15 (previously 8.5.5 in 2019), updated storage protection criteria in Chapter 16, and revised residential sprinkler provisions. The section numbering for spacing remained stable. IBC 2021 references the 2019 edition; IBC 2024 references the 2022 edition.
What plan reviewers look for
Plan reviewers measure sprinkler spacing on the shop drawings and verify it against Table 8.5.2.1 for the hazard classification. They check the maximum area of coverage per sprinkler and the maximum and minimum spacing distances. They verify that the hazard classification (light, ordinary group 1 or 2, extra hazard) is correctly determined based on the building occupancy and contents.