Sprinklers are needed if roof or deck is present.

• A. Sprinklers never required on roofs.
• B. Sprinklers needed if roof or deck is present.
• C. Sprinklers required only if the deck is below grade.
• D. Sprinklers required only if the roof is flat.

Answer: (B)

In NFPA 13R for low‑rise residences, sprinklers are required when a roof or deck is present because these features create additional fire exposure paths and hidden fuel loads that can quickly feed a fire. An attached roof or an under‑deck space can conceal attic or concealed spaces where a fire can grow before it’s noticed, and a sprinkler system helps control that growth early, protecting living areas and limiting damage. The presence of a roof or deck is a practical trigger to provide automatic protection throughout the structure, rather than excluding roof areas or relying on other conditions like deck below grade or roof shape. So, sprinklers are needed if a roof or deck is present.