Bulletin 044
December 2022
Page 8 of 9
www.reliablesprinkler.com
CEILING
FULL DEPTH BLOCKING OF SAME MATERIAL AS JOIST
(OR NONCOMBUSTIBLE MATERIAL). MAXIMUM 32 ft (9.75 m)
BETWEEN ROWS OF BLOCKING.
UPPER
DECK
SEE NOTE 1
AND 1A
SEE NOTE 2
6 in. (150 mm) OR
1/3 DEPTH OF SPACE
(WHICHEVER IS GREATER)
MINIMUM 1/4 in. PLYWOOD
DRAFT CURTAIN AT MAXIMUM
31 ft (9.45 m) SPACING
LOCATION OF STEEL PIPE
IN CONCEALED SPACE IS
NOT RESTRICTED
NOTE 3
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).
1A. WHERE CEILING IS NOT SUPPORTED BY JOISTS (EXAMPLE: SUSPENDED A.C.T.) MEASUREMENT POINT IS TOP OF CEILING.
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.
HYDRAULIC DESIGN AREA REQUIREMENTS
1.
WET OR DRY SYSTEM: BLOCKING AND 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.
SPRINKLER SPACING AND COVERAGE AREA
A. 14 ft (4.3 m) MAXIMUM BETWEEN SPRINKLERS
B.
6 ft (1.8 m) MINIMUM BETWEEN SPRINKLERS
C. 196 ft
2
(18.2 m
2
) MAXIMUM COVERAGE AREA PER SPRINKLER
12 in. (300 mm)
MAX JOIST
DEPTH
Figure 6
Solid Wood Joist (Non-Filled), Steel Pipe
Draft Curtain and Blocking: Required at 1000 Ft
2
(93 m
2
)
