What does complete coverage require?

What does complete coverage require?

• A. Sprinklers must cover only high-risk areas.
• B. Sprinklers must cover the entire floor area.
• C. Sprinklers must cover only obstructions.
• D. Sprinklers must cover only the ceiling.

Answer: (B)

The main idea is that complete coverage means every part of the floor area is within the spray pattern of at least one sprinkler head. In NFPA 13R for low-rise homes, the system is designed so that no open floor space is left unprotected on each floor, so a fire starting anywhere on the floor can be reached by sprinkler discharge quickly. That’s why covering only high-risk areas isn’t sufficient—protection must extend to the entire floor area. It’s also not about covering only obstructions or only the ceiling; sprinklers provide protection down to the floor, and the layout must ensure that every floor area is within a sprinkler’s coverage zone.

The main idea is that complete coverage means every part of the floor area is within the spray pattern of at least one sprinkler head. In NFPA 13R for low-rise homes, the system is designed so that no open floor space is left unprotected on each floor, so a fire starting anywhere on the floor can be reached by sprinkler discharge quickly.

That’s why covering only high-risk areas isn’t sufficient—protection must extend to the entire floor area. It’s also not about covering only obstructions or only the ceiling; sprinklers provide protection down to the floor, and the layout must ensure that every floor area is within a sprinkler’s coverage zone.