Tyco BB Series - Page 14

TFP610
Page 14 of 28
There can be a maximum 6 inch (152,4 mm) high Horizontal Obstruction as long as it is 36 inches (914,4 mm), measured
vertically, below the Attic Sprinkler. If the obstruction is closer or larger, there must be a sprinkler on the other side of the
obstruction. Reference Figures 16A and 16B. This criteria does not limit the top chord of the trusses or the depth of the
rafter, but does limit the obstructions that run across the trusses or rafters.
FIGURE 16A FIGURE 16B
BB ATTIC
SPRINKLER
6" MAX.
(152,4 mm)
36" MIN.
(914,4 mm)
NO
ADDITIONAL
SPRINKLER
REQUIRED
3-1/2" MIN.
(88,9 mm)
AIR SPACE
BB ATTIC
SPRINKLER
ANY
DISTANCE
ADDITIONAL AP
OR STANDARD SPRAY
SPRINKLER REQUIRED
(LOCATE PER FIGURE
14A OR 14B)
GREATER
THAN 6"
(152,4 mm)
6" (152,4 mm)
MINIMUM
36" (914,4 mm)
MINIMUM
BB ATTIC
SPRINKLER
NO
ADDITIONAL
SPRINKLER
REQUIRED
4'-0" (1,2 m)
MAXIMUM
LESS THAN
6" (152,4 mm)
36" (914,4 mm)
MINIMUM
BB ATTIC
SPRINKLER
GREATER THAN
4'-0" (1,2 m)
ADDITIONAL AP
OR STANDARD SPRAY
SPRINKLER(S)
REQUIRED (LOCATE
PER FIGURE
14A OR 14B)
40"-48" (1016,0 mm-1219,2 mm)
30"-40" (762,0 mm-1016,0 mm)
20"-30" (508,0 mm-762,0 mm)
10"-20" (254,0 mm-508,0 mm)
8"-10" (203,2 mm-254,0 mm)
4"-8" (101,4 mm-203,2 mm)
1"-4" (25,4 mm-101,6 mm)
1/2"-1" (12,7 mm-25,4 mm)
> 48" (1219,2 mm)
Maximum
Horizontal
Dimension of
Obstruction
All Vertical Obstructions
Dimension A
Any Distance
25'-0" (7,62 m)
20'-0" (6,10 m)
15'-0" (4,57 m)
10'-0" (3,05 m)
5'-0" (1,52 m)
24" (609,6 mm)
12" (304,8 mm)
6" (152,4 mm)
Minimum
Horizontal
Distance to
Obstruction
< 6" (152,4 mm)
Distance B
NO
YES
NO
NO
NO
NO
NO
NO
NO
YES
Additional
Sprinkler
Required
Beyond
Obstruction
DIMENSION A
PER TABLE
ADDITIONAL AP
OR STANDARD SPRAY
SPRINKLER REQUIRED
(LOCATE PER FIGURE
14A OR 14B)
DIMENSION B
PER TABLE
If the Horizontal Obstruction is below the sprinkler, there
must be 6 inches (152,4 mm) clearance over the top of the
obstruction, and the obstruction must be 4 feet (1,2 m) or
less in width to allow water to pass both over and under
the obstruction. The clearance is measured perpendicular
to and from the bottom of the rafter. If there is not 6 inches
(152,4 mm) of clearance above the obstruction, a sprinkler
must be located on the other side of the obstruction. If the
obstruction is greater than 4 feet (1,2 m) in width, a sprinkler
must be added below the obstruction. Reference Figures
16C and 16D, where the maximum spacing for AP Sprin-
klers is 12 feet (3,7 m) and Standard Spray Sprinklers is 15
feet (4,6 m).
For Vertical Obstructions, the maximum dimension of the
obstruction is its width and the horizontal distance away
from the obstruction is measured horizontally.
FIGURE 16D
FIGURE 16E
FIGURE 16 (1 OF 2)
OBSTRUCTIONS TO WATER DISTRIBUTION — BB, SD & HIP
(Obstructions to Water Distribution for Attic Sprinklers Differ from Standard Sprinklers as Shown)
FIGURE 16C