The Shadow Areas update addresses configurations in which structures?

The Shadow Areas update addresses configurations in which structures?

• A. Configurations in unprotected structures
• B. Fire suppression hydraulics
• C. Configurations in protected structures
• D. Fire resistance ratings

Answer: (C)

Shadow areas are concerns about sprinkler coverage inside spaces that are protected by NFPA 13R. The update specifically clarifies configurations that can create uncovered or undersupplied zones within protected structures, where the dwelling already has a sprinkler system but certain layouts or obstructions can block spray and reduce protection. This guidance helps designers identify where those shadow areas can occur and what adjustments are needed—such as modifying sprinkler placement, adding coverage in critical zones, or addressing obstructive features—to ensure the required density is achieved throughout the protected space. It’s not about unprotected buildings, hydraulics calculations, or fire-resistance ratings, which are separate topics.

Shadow areas are concerns about sprinkler coverage inside spaces that are protected by NFPA 13R. The update specifically clarifies configurations that can create uncovered or undersupplied zones within protected structures, where the dwelling already has a sprinkler system but certain layouts or obstructions can block spray and reduce protection. This guidance helps designers identify where those shadow areas can occur and what adjustments are needed—such as modifying sprinkler placement, adding coverage in critical zones, or addressing obstructive features—to ensure the required density is achieved throughout the protected space. It’s not about unprotected buildings, hydraulics calculations, or fire-resistance ratings, which are separate topics.