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I'm designing a sprinkler system for a hotel. The layout is pretty standard with hotel rooms and corridors, but on one end of the corridor is a "suite" of utility/maintenance rooms.
The rooms are labelled as "Housekeeping" (260sf), and through that, "Electrical" (70sf), and "Linen Chute" (30sf). All walls are 1-hour rated. I am calculating them as Ordinary Group 1. My question is: How do I determine the design area? Can I calculate just the Ordinary Hazard spaces like a Room Design method, or would I calculate the Ordinary Hazard spaces plus four corridor sprinklers? Or does it need to be 900 sf (1500 with QR reduction)? Thanks! Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
4 Comments
Pete H
1/22/2026 06:14:22 am
If allowed the QR reduction due to ceiling height: then 900 square feet, ideally around the most remote OH1 room. It is unlikely you'll be able to get all of them, so just pick the one furthest from your source.... Probably Electrical as that's the one that's likely to be on the top floor, but that will depend on how many floors you have, etc. 1/22/2026 08:16:22 am
Well, assuming you are using the Density/Ara Method...QR reduction the pickup rooms/corridor until that minimum is met. This also assumes there are no combustible concealed spaces that would trigger the 3000 ft² or 8 sprinkler calc's.
Philippe Léveillé
1/22/2026 08:44:55 am
If using NFPA 13-2025, and occupancy hazard design approch, 19.1.2 Adjacent Hazards or Design Methods, might be helpful.
Glenn Berger
1/22/2026 08:52:32 am
I agree that most of your spaces will be OH1. Be careful when just using room names when determining the required sprinkler system design parameters. Leave a Reply. |
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