Figure 11 - Minimum Distance Between Sprinklers on Intersecting Ceilings
First verify that “D” is “Acceptable” or “Obstructed” per
Figure 13 for the horizontal ceiling sprinkler and Figure 14
for the sloped ceiling sprinkler. If “Acceptable”, Figure 11
applies. If “Obstructed”, per Figure 13 or 14, then “D” is to
be considered the area of coverage. The minimum distance
between sprinklers is measured horizontally. Staggering
sprinklers will help maintain maximum horizontal distances
in difficult situations. Dimension “B” is measured along the
slope. For angles greater than 60
°
, verify with Central's
Technical Services Department.
B — See “E” for minimum spacing. Maximum Listed
spacing that the sprinkler was calculated for.
D — Distance to intersecting ceiling.
E — NFPA minimum of 8'-0" (when minimum of 8' 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
°
.
D
E
D
F
B
Figure 12 - Sprinkler Location on Sloped Ceiling Intersecting a Flat Ceiling
First verify that “D” is “Acceptable” or “Obstructed” per
Figure 14. If “Acceptable”, Figure 12 applies. If “Ob-
structed”, additional sprinklers will be necessary to protect
the flat ceiling area. Dimension “A” is measured along the
slope. 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.
C — Maximum 3'-0" vertically from the peak.
D — Refer to Figure 14.
F — Acceptable for angles 0
°
to 60
°
.
A
D
C
A
Figure 13 - Obstruction to Discharge by Intersecting Sloped Ceiling
If “D” is “Obstructed” per Figure 13 Graph, then “D” is to
be considered the area of coverage and additional
sprinklers along the sloped ceiling will be necessary.
Only if “D” is “Acceptable” can “A” be considered 1/2 of
the maximum Listed spacing that the sprinkler was
calculated for. Dimension “A” is measured along the
slope.
A — Maximum 1/2 of the Listed spacing that the sprinkler
was calculated for.
D — Distance to intersecting sloped ceiling.
F — Acceptable for angles 0
°
to 60
°
.
D
A
F
0
°
4
°
8
°
12
°
16
°
20
°
24
°
28
°
32
°
36
°
40
°
44
°
48
°
52
°
56
°
60
°
10'
9'
8'
6'
5'
4'
3'
2'
1'
7'
"D"
(in feet)
"F"
(in degrees)
Obstructed
Acceptable
20' x 20'
18' x 18'
16' x 16'
14' x 14'
12' x 12'
OBSOLETE
