46.03
16398 Rev B Updated 04/2021 © 2021 Victaulic Company. All rights reserved.
5.0 PERFORMANCE (CONTINUED)
Layout Criteria – Under-Hip Sprinkler: Hip Truss/Jack Truss Construction
Sprinkler Model
• FL-SA/GAP
Flow Rate
• 20 gpm
Distance Between Sprinklers
First Row From Eave (Measured Horizontally)
• Minimum 6 ft
• Maximum 8 ft
Distance Between Sprinklers
All Other Rows Upslope (Measured Horizontally)
• Minimum 6 ft
• Maximum 12 ft
Distance From Eave To First Row
(measured horizontally)
• Minimum 5 ft
• Maximum 12 ft
Distance Between Rows (Measured Horizontally)
• Minimum 6 ft
• Maximum 10 ft
Deflector Distance Below Ceiling
• Install with deflector below bottom of top chord 1"
minimum to 3" maximum.
Sprinkler at Apex
• A FL-SA/GAP Sprinkler must be installed between 1
ft. to 5 ft. down from the intersection of the ridgeline
and hip lines (Apex)
Sprinklers Adjacent to Hip Line
• All FL-SA/GAP Sprinklers directly adjacent to hip
line shall be 1 ft. to 3 ft. from hip line (as measured
perpendicular to hip line)
Installation
• Ensure that the sprinkler is installed with the
deflector parallel to the sloped roof above.
• Sprinklers must be installed with the frame arms
perpendicular to the roof slope (see Figure 35).
• When installed under a flat sloped ceiling
(noncombustible insulation filled joist channels),
maximum deflector to ceiling distance is the same
as maximum distance below bottom of top chord.
Distance to be measured to bottom of Insulation.
Hydraulic Calculations
• See Hydraulic Design Section
FIGURE 12A: HIP LAYOUT CRITERIA WHEN FIRST ROW OF SPRINKLERS
PLACED "WITHIN" JACK TRUSSES
FIGURE 12B: HIP LAYOUT CRITERIA WHEN FIRST ROW OF SPRINKLERS
PLACED "BEYOND" JACK TRUSSES
FIGURE 12: HIP LAYOUT CRITERIA – HIP TRUSS/JACK TRUSS CONSTRUCTION
NOTE
• If a flat sloped ceiling is present utilizing non combustible insulation, the insulation must completely fill the pockets between the joists, and the insulation must
be secured in place with metal wire netting or equivalent. The metal wire netting is intended to hold the insulation in place should the insulation become
wetted by the operation of the sprinkler. Attic sprinklers have not been evaluated for use with spray foam insulation.
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