What is the maximum interval in feet for installing fireblocking in exterior wall coverings to prevent concealed spaces exceeding 100 sq ft?

The maximum interval for installing fireblocking in exterior wall coverings is critical in preventing the spread of fire through concealed spaces. When concealed spaces exceed 100 square feet, fireblocking is necessary to restrict fire movement and provide additional safety.

The specified interval of 20 feet for fireblocking is based on fire safety codes and standards that ensure fire barriers can effectively contain or slow the vertical and lateral movement of flames and smoke in wall cavities. When fireblocking is installed at these intervals, it enhances the overall fire-resistive capabilities of the structure, contributing to the safety of occupants and protection of property.

Intervals shorter than this might lead to insufficient fire containment, while longer intervals would not provide adequate safety measures. This requirement is designed to limit fire propagation by creating barriers that can effectively compartmentalize potential fire spread within the building's wall systems.