If it’s a closet, I would protect it. If it’s an open stairwell in a sprinklered compartment, I would not. In a 13D design, I would not concern myself with whether the stair is surfaced with non-combustible sheathing or not, but that’s MY opinion only.
Steve L. From: Anthony Johnson <[email protected]> Sent: Wednesday, June 26, 2024 2:53 PM To: Discussion list on issues relating to automatic fire sprinklers <[email protected]> Subject: [Sprinklerforum] Interior Stairwells 13R vs 13D 13R 2019 states "6.6.9.2 Sprinklers shall not be required underneath stair risers in dwelling units where the walls and ceilings are surfaced with noncombustible or limited-combustible finishes." I do not see a similar statute in 13D. Is there a reason for this? What is your practice for addressing sprinklers under the stair risers in 13D systems? Thanks, Anthony
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