46.03
16398 Rev B Updated 04/2021 © 2021 Victaulic Company. All rights reserved.
5.0 PERFORMANCE (CONTINUED)
Dormer Protection Criteria
Dormers Built Entirely Over (on top) of Main Roof Sheathing – 4 Sprinklers or Less
• FL-SA/BB, FL-SA/GAP, and FL-SA/DS sprinklers allowed (CPVC allowance applies for wet systems only)
• Standard Spray Sprinklers allowed
Dormers Built Entirely Over (on top) of Main Roof Sheathing – More than 4 Sprinklers
• FL-SA/BB, FL-SA/GAP, and FL-SA/DS Sprinklers allowed- Protection scheme utilized shall be in accordance with
this document
• Standard Spray Sprinklers allowed for any slope
Dormers Open to Attic Space Below – 4 Sprinklers or Less
• FL-SA/BB, FL-SA/GAP, and FL-SA/DS Sprinklers allowed (CPVC allowance applies for wet systems only)
• Standard Spray Sprinklers allowed
Dormers Open to Attic Space Below – More than 4 Sprinklers
• FL-SA/BB, FL-SA/GAP, and FL-SA/DS Sprinklers allowed. Protection scheme utilized, shall be in accordance with
this document
• Standard Spray Sprinklers allowed but required to calculate Attic in accordance with NFPA 13 (i.e. 2535 sq. ft.
for Dry Systems)
FIGURE 17A: DORMER OPEN TO ATTIC SPACE
FIGURE 17B: DORMER ENTIRELY OVER MAIN ROOF SHEATHING
FIGURE 17: DORMERS SECTION VIEW
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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