Bulletin 044
December 2022
Page 7 of 9
www.reliablesprinkler.com
6 in. [150 mm]
MAXIMUM
OBSTRUCTION
CEILING
NONCOMBUSTIBLE INSULATION, SECURED ABOVE
SPRINKLERS WITH WIRE NETTING OR EQUIVALENT
UPPER
DECK
SEE NOTE 2
PIPE SHALL BE LOCATED A MAXIMUM OF 6 in. (150 mm)
ABOVE THE TOP OF THE CEILING (OR INSULATION), OR
A MAXIMUM OF ONE-THIRD (1/3) THE DEPTH OF THE
CONCEALED SPACE ABOVE THE TOP OF THE CEILING,
WHICHEVER IS SMALLER.
SEE NOTE 1
WHEN OFFSETTING CPVC PIPE OVER
OBSTRUCTION, A CCS SPRINKLER MUST BE
INSTALLED DIRECTLY ON THE PIPE OVER THE
OBSTRUCTION.
INSTALLATION NOTES:
1.
DISTANCE EVALUATED AS PART OF THE cULus LISTING: 12 in. TO 36 in. (300 mm TO 900 mm). NFPA 13 PERMITS INSTALLATION OF
THE SPRINKLER WHERE THIS DISTANCE IS LESS THAN 12 in. (300 mm).
2.
DEFLECTOR DISTANCE BELOW BOTTOM OF JOIST TO 1-1/2 in. TO 4 in. (38 mm TO 100 mm) BELOW BOTTOM OF TOP CHORD. IN NO
CASE SHALL DEFLECTOR BE ABOVE THE BOTTOM OF THE SOLID OR COMPOSITE WOOD JOIST.
3.
INSTALL SPRINKLER WITH FRAME ARMS PARALLEL TO PIPE.
NOTE 3
HYDRAULIC DESIGN AREA REQUIREMENTS
1.
WET SYSTEM: DRAFT CURTAINS (OR FULL HEIGHT WALLS) MUST BE PROVIDED AT 1000 ft
2
(93 m
2
) MAXIMUM AREAS. CALCULATE
ALL SPRINKLERS WITHIN THE COMPARTMENTED AREA.
2.
ADDITIONAL SPRINKLERS THAT ARE REQUIRED FOR PROTECTION OF CPVC PIPING THAT IS OFFSET OVER AN OBSTRUCTION DO
NOT NEED TO BE INCLUDED IN THE DESIGN AREA.
SPRINKLER SPACING AND COVERAGE AREA
A. 16 ft (4.9 m) MAXIMUM BETWEEN SPRINKLERS
B.
6 ft (1.8 m) MINIMUM BETWEEN SPRINKLERS
C.
256 ft
2
(23.4 m
2
) MAXIMUM COVERAGE AREA PER SPRINKLER
Figure 5
Solid Wood or Composite Wood Joist Filled with Non-Combustible Insulation, CPVC Pipe
Draft Curtains: Required at 1000 Ft
2
(93 m
2
)
