I have a skylight that is 4-ft (length) x 6-ft (width) x 5-ft (depth). The room has a drywall ceiling and the depth of the pocket is about 4-ft of dry wall between the ceiling with an additional 1'-0" of glass (for the skylight) that domes above the roof at the top of the pocket.
Can I omit a sprinkler in the skylight per NFPA 13 2016 Section 8.5.7, or do I need a sprinkler in the skylight under Section 8.6.7 due to the depth of the unprotected ceiling pocket exceeding 36-inches?
NFPA 13, 2016 Section 8.5.7 (Skylights) permits sprinklers to be omitted from skylights not exceeding 32ft² that are separated by at least 10ft horizontally from any other unprotected skylight or unprotected ceiling pocket.
NFPA 13, 2016 Section 8.6.7 (Ceiling Pockets) says sprinklers shall not be required in ceiling pockets where all of the following are met: (1) The total volume of unprotected ceiling pocket does not exceed 1000ft³.(2) The depth of the unprotected ceiling pocket does not exceed 36 in. (3) The entire floor under the unprotected ceiling pocket is protected by sprinklers at the lower ceiling elevation. (4) the total size of all unprotected ceiling pockets in the same compartment with in 10ft of each other does not exceed 1000ft³. (5) The unprotected ceiling pocket has noncombustible or limited-combustible finishes. (6) Quick-response sprinklers are utilized throughout the compartment.
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