What is another area not protected by a 13R sprinkler system?

A 13R sprinkler system is designed primarily for residential buildings, providing a basic level of fire protection. However, it offers limited coverage, typically focusing on areas that are habitated or used for living purposes. Void spaces, which refer to areas that are not actively used for occupancy (such as attics or spaces between floors), are often not protected by these sprinklers. The decision to exclude void spaces from coverage is based on the assumption that these areas do not contribute significantly to the risk of fire or the safety of occupants.

In contrast, garages, living rooms, and basements usually have more active use and potential fire hazards, which are why they are typically included in the protection scope of a 13R system. Therefore, the lack of protection for void spaces aligns with their lower risk profile and the system's intent to prioritize areas with a greater likelihood of fire hazards and occupancy.