
46.03
16398 Rev B Updated 04/2021 © 2021 Victaulic Company. All rights reserved.
5.0 PERFORMANCE (CONTINUED)
Obstructions
FL-SA/BB
FL-SA/DS
Dimension A
Dimension B
Maximum Horizontal
Dimension of
Obstruction
Minimum Horizontal
Distance to
Obstruction
Additional Sprinkler
Required Beyond
Obstruction
inches (mm)
inches (mm)
All Vertical Obstructions
<6" (152.4)
Yes
1/2" < 1" (12.7 – 25.4)
6" (152.4)
No
1" < 4" (25.4 < 101.6)
12" (304.8)
No
4" < 8" (101.6 < 203.2)
24" (609.6)
No
8" < 10" (203.2 < 254)
5'-0" (1.52 )
No
10" < 20" (254 < 508)
10'-0" (3.05 )
No
20" < 30" (508 < 762)
15'-0" (4.57 )
No
30" < 40" (762 < 1016)
20'-0" (6.10 )
No
40" < 48" (1016 <
1219.2)
25'-0" (7.62 )
No
>48" (1219.2)
Any Distance
Yes
Piggyback Trusses
When trusses are stacked (“Piggyback”) at the peak,
consideration to obstructions to the spray pattern of the
FL-SA/BB sprinklers must be made. These “Piggyback”
configurations will typically include 2x “Stiffeners” running
perpendicular to the trusses. Additionally, these “stiffeners”
will be sandwiched between the uppermost and lowermost
horizontal chords of the two stacked trusses.
In the event that all members are above the level of the
FL-SA/BB deflector, no obstruction exists to the FL-SA/
BB spray pattern. See Figure 32.
“FL-SA/BB”
FIGURE 32: DEFLECTOR COMPLETELY BELOW STIFFENERS AND
HORIZONTAL WEB MEMBERS (NO OBSTRUCTION)
In the event that the FL-SA/BB Deflector is located
completely above the stiffeners and horizontal web
members, the parameters of Figure 33 as appropriate,
must be met for the spray pattern to be considered
unobstructed.
When all of the following are met, additional sprinkler(s)
below stiffeners are not required:
• The FL-SA/BB sprinklers are located a minimum of
12 in. (304.8 mm) above the stiffeners.
• The stiffeners are 7½ in. (190.5 mm) maximum in
width
• The openings are 12 in. (304.8 mm) minimum
• There is 70% minimum open area
“FL-SA/BB”
FIGURE 33: DEFLECTOR ABOVE STIFFENERS AND
HORIZONTAL WEB MEMBERS (NO OBSTRUCTION)
When the FL-SA/BB sprinklers are located above the
stiffeners, but do not meet all of the parameters of
Figure 34 the FL-SA/BB sprinklers must be located in
accordance with Figure ZZ relative to the stiffeners.
“FL-SA/BB”
DIMENSION A
DIMENSION B
BB46
BB79
BB1012
A>0"
A=15"
A+10"
A=8"
“FL-SA/BB”
FIGURE 34: DEFLECTOR LESS THAN 12" ABOVE STIFFENERS (NO OBSTRUCTION)
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