NFPA 13
NFPA 13 is the Standard for the Installation of Sprinkler Systems — the governing design document. It classifies occupancies by fire-load hazard and sets the design density, spacing, and water supply duration a sprinkler system must achieve. Tenant improvements, change of use, and new construction all trigger NFPA 13 design review.
Key requirements
- 1
Occupancy hazard classification: Light, Ordinary 1, Ordinary 2, Extra 1, Extra 2
- 2
Design density + hose stream allowance set by hazard class
- 3
Hydraulic calculations submitted with sprinkler permit drawings
- 4
Water supply curve demonstrated to match or exceed demand curve
- 5
Underground mains flushed; aboveground piping hydrostatically tested at 200 psi
- 6
48-hour pneumatic test on dry-pipe systems
Published summary for informational use. Fire code adoption varies by jurisdiction and edition. Verify current enforced codes with your local Authority Having Jurisdiction (AHJ) and consult a licensed fire protection contractor before taking action. Not legal or professional advice.