UPPER
DECK
4-1/2 in. (114 mm) MINIMUM FROM
CENTERLINE OF SPRINKLER TO
FACE OF TOP CHORD OF WOOD
TRUSS OR BAR JOIST
OBSTRUCTION
CEILING
6 in. (150 mm)
MAXIMUM
WHEN OFFSETTING CPVC PIPE OVER AN
OBSTRUCTION, A CCS SPRINKLER MUST BE
INSTALLED DIRECTLY ON THE PIPE OVER THE
OBSTRUCTION. MAINTAIN 18 in. (460 mm)
CLEARANCE TO HEAT PUMPS, FAN MOTORS,
HEAT LAMPS, OR OTHER HEAT SOURCES.
SEE NOTE 2
INSTALLATION NOTES:
1.
DISTANCE EVALUATED AS PART OF THE cULus LISTING: 12 in. TO 60 in. (300 mm TO 1500 mm). NFPA 13 PERMITS INSTALLATION OF THE
SPRINKLER WHERE THIS DISTANCE IS LESS THAN 12 in. (300 mm).
2.
DEFLECTOR TO BE NO MORE THAN 2 in. (50 mm) MAXIMUM BELOW BOTTOM OF TOP CHORD. IN NO CASE SHALL DEFLECTOR BE
ABOVE THE BOTTOM OF THE TOP CHORD.
3.
INSTALL SPRINKLER WITH FRAME ARMS PARALLEL TO PIPE.
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
HYDRAULIC DESIGN AREA REQUIREMENTS
A.
WET SYSTEM: WHERE DRAFT CURTAINS (OR FULL HEIGHT WALLS) ARE PROVIDED AT MAXIMUM AREAS OF 1000 ft
2
(93 m
2
) OR LESS,
CALCULATE ALL SPRINKLERS WITHIN THE COMPARTMENTED AREA.
B.
WET SYSTEM: WHERE DRAFT CURTAINS (OR FULL HEIGHT WALLS) ARE NOT PROVIDED, OR PROVIDED AT AREAS EXCEEDING 1000 ft
2
(93
m
2
), CALCULATE AN AREA OF 1000 ft
2
(93 m
2
) OR SIX SPRINKLERS, WHICHEVER CREATES THE GREATER DEMAND.
C.
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.
NOTE 3
SPRINKLER SPACING AND COVERAGE AREA
A. 16 ft (4.9 m) MAXIMUM BETWEEN SPRINKLERS
B.
6 ft (1.8 m) MINIMUM BETWEEN SPRINKLERS (DOES NOT APPLY TO SPRINKLERS ADDED TO PROTECT CPVC PIPING OFFSET OVER AN
OBSTRUCTION)
C.
256 ft
2
(23.8 m
2
) MAXIMUM COVERAGE AREA PER SPRINKLER
6 in. (150 mm)
MAXIMUM
TOP CHORD DEPTH 4 in.
(100 mm) OR LESS
Figure 2
Unobstructed Wood Truss or Bar Joist, CPVC Pipe
Bulletin 044
December 2022
Page 4 of 9
www.reliablesprinkler.com
Draft Curtains: Optional
