Figure 10 - Minimum Distance Between Sprinklers on Intersecting Ceilings
First verify that “D” is “Acceptable” or “Obstructed” per
Figure 12 for the horizontal ceiling sprinkler and Figure 13
for the sloped ceiling sprinkler. If “Acceptable”, Figure 10
applies. If “Obstructed”, per Figure 12 or 13, 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 11 - Sprinkler Location on Sloped Ceiling Intersecting a Flat Ceiling
First verify that “D” is “Acceptable” or “Obstructed” per
Figure 13. If “Acceptable”, Figure 11 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 13.
F — Acceptable for angles 0
°
to 60
°
.
A
D
C
A
Figure 12 - Obstruction to Discharge by Intersecting Sloped Ceiling
If “D” is “Obstructed” per Figure 12 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
