Pendents Located Along Multiple Slopes
• Spacing is measured along the slope.
• One row of sprinklers is shown on the sloping ceiling for
clarity. Actual number of sprinklers within a compartment is
unlimited.
• Cathedral ceiling applications: An 8" minimum beam or
lintel is required at the peak.
• If a loft adjoins the sloped ceiling compartment, a
minimum 8" deep lintel is required between the loft and
the ceiling.
• Hydraulic calculations shall conform to the appropriate
NFPA standard. Calculate the two (NFPA 13D) or four
(NFPA 13R) most demanding sprinklers along one slope.
If there are less than two (NFPA 13D) or four (NFPA 13R)
sprinklers along one slope, calculate all the sprinklers
along one slope. For ceilings with adjoining lofts, add one
sprinkler in the loft to the hydraulic calculations.
• Openings in the perimeter walls, such as a doorway or
adjoining hallway, must maintain a maximum height of 8 feet
or less.
Figure 4 - UL Specific Application Sloped Ceiling Design Criteria
a
a
b
b
D = MAXIMUM SLOPE
8:12 (33.7
O
)
D
a
a
Figure 5 - Sprinkler Location for Sloped Ceiling
Note the minimum distance between sprinklers changes by
the angle of the slope. Verify the Listed flows and pressures
for “maximum” and “1/2 maximum” distances. Dimensions
“A” and “B” are measured along the slope. For angles
greater than 60
°
, verify with Central's Technical Services
Department.
A — NFPA minimum of 4" (verify “G” dimension minimum of
4"), maximum 1/2 of the Listed spacing that the sprinkler
was calculated for. (i.e., 18' x 18' spacing is maximum of
9'-0" from a wall).
B — For angles 0
°
to 39
°
minimum B = 8'-0".
For angles 40
°
to 45
°
minimum B = 9'-0".
For angles 46
°
to 60
°
minimum B = 9'-6".
Maximum Listed spacing that the sprinkler was calcu-
lated for.
C — Maximum of 3'-0" vertically from the peak.
F — Acceptable for angles 0
°
to 60
°
.
G — Minimum of 4", for maximum, refer to “A” and measure
along slope.
B
G
A
A
G
C
• a: minimum:
4"
maximum: one-half the maximum calculated
spacing
• b: minimum:
8'-0"
maximum: 16'-0"
• The minimum lateral distance between sprinklers on
opposing slopes is 8'-0"
Figure 6 - Symmetric Sprinkler Location on Opposing Slopes*
The minimum distance between sprinklers on opposing slopes
is measured horizontally, some difficult conditions can be
solved by staggering the sprinklers, thus increasing the
horizontal distance. Remember to measure along the slope
for “A” and “B”. For angles greater than 60
°
, verify with
Central's Technical Services Department.
A — NFPA minimum of 4", maximum 1/2 of the Listed spacing
that the sprinkler was calculated for.
B — See “E” for minimum spacing. Maximum Listed spacing
that the sprinkler was calculated for.
C — Maximum 3'-0" vertically from the peak.
E — NFPA minimum of 8'-0" (when minimum of 8'-0" cannot
be obtained due to “B”, a baffle must be installed
between these sprinklers to obstruct the discharge
and prevent cold-solder). See “B” for maximum.
F — Acceptable for angles 0
°
to 60
°
.
* For unequal spacing down from peak, see Figure 8.
A
A
A
A
E
C
B
F
F
OBSOLETE
