What determines the spacing of extinguishing systems in multi-story buildings?

The spacing of extinguishing systems in multi-story buildings is primarily determined by the interpretation of the Authority Having Jurisdiction (AHJ). The AHJ is responsible for enforcing building codes and fire safety regulations within a specific jurisdiction, which means they may apply national standards, such as those from the International Building Code (IBC), but also have the discretionary power to adjust regulations based on local conditions, historical factors, or unique characteristics of the buildings in their area.

In many cases, the layout and occupancy of a multi-story building may require specific considerations that are not fully addressed by general codes, leading the AHJ to make interpretations or establish guidelines to ensure adequate fire protection. The AHJ's understanding and assessment of risk, along with their expertise in local conditions, play a crucial role in determining the appropriate spacing and placement of extinguishing systems, ensuring that they effectively meet the needs of the building and its occupants.

While IBC standards, local codes, and directives from Fire Marshals can influence these decisions, it is the AHJ’s interpretation that often tailors the application of these broader standards to suit the specific context of a given building, making their involvement essential in this process.