Ten-Story Hotel Renovation: NFPA 13R Plans Submitted
A design-build contractor submits sprinkler plans for a 10-story, 110 ft tall existing hotel (240 guest rooms, Type III-B construction, built in 1986) undergoing a full renovation. The plans use NFPA 13R for the guest-room floors and NFPA 13 for the ground-floor lobby, restaurant, and basement. The project also adds a new 1,500 gpm fire pump and modifies the existing Class I standpipe. The plan reviewer notes that the building has open-ended corridors and combustible exterior balconies. The contractor's cover letter cites 'residential occupancy' and the 2013 edition of NFPA 13R, while the jurisdiction has adopted the 2021 IBC and NFPA 13 (2022). The contractor requests approval to start rough-in within 10 days and argues that the existing building should be allowed to use 13R because it was built under an older code. The AHJ has not yet issued a permit for the fire pump.
1. Identify the code basis that governs the sprinkler design and explain whether NFPA 13R is permitted for the guest-room floors.
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The governing documents are the editions adopted by the jurisdiction: the 2021 IBC and NFPA 13 (2022), not the contractor's cited 2013 NFPA 13R. NFPA 13R is scoped to residential occupancies up to and including four stories in height and 60 ft above grade. This building is 10 stories and 110 ft tall, so the height and story limits are exceeded and 13R cannot be used for the guest-room floors. The 'existing building' argument does not convert new sprinkler work into a grandfather right; the renovation is adding a new system and a new fire pump, so the adopted code applies to the new work. The open-ended corridors and combustible balconies also raise questions that a 13R design would not answer in the same way as a 13 design. The correct action is to reject the 13R submittal, require a complete NFPA 13 design with hydraulic calculations for the 10-story configuration, and coordinate the sprinkler design with the standpipe and fire pump submittals.
2. What documentation and coordination steps should the reviewer require before rough-in is allowed?
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The reviewer should issue written plan-review comments that cite the adopted code editions and the specific reason 13R is not acceptable. Require a revised submittal package: NFPA 13 shop drawings, hydraulic calculations, material and device submittals, and a fire pump package prepared to NFPA 20. The standpipe modification must be shown on the same coordinated drawings, including the new pump discharge, test header, and PRV locations. The contractor must obtain the fire pump permit and any required AHJ approvals before installation. The reviewer should log the rejection, the resubmittal date, and all AHJ correspondence in the project file, and should not give verbal approval to start rough-in. A preconstruction meeting with the contractor, designer, and AHJ should confirm the sequence, inspection hold points, and the records that will be required at acceptance. This prevents a field conflict where sprinkler piping is installed before the pump and standpipe design are approved.
3. The contractor asks whether the standpipe and fire pump can be approved separately to save time. How should the reviewer respond?
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Separate permits can be considered only if the systems are truly independent and each is complete for the portion being approved. Here they are hydraulically and physically connected: the fire pump supplies the combined sprinkler/standpipe system, and the standpipe modification changes the system demand. Approving the standpipe without the pump would leave the reviewer unable to verify the required pressure at the topmost outlet; approving the pump without the standpipe would leave the discharge path and test header unverified. The reviewer should require a coordinated submittal or, at minimum, a documented interface schedule showing pump rated point, churn, standpipe demand, and PRV settings. Any phased approval must be in writing and must state the limitations and the final acceptance tests that remain. The project record should show that the AHJ accepted the phasing.