What is the distance required between the back of combustible exterior wall covering and the external wall when they are furred out?

The correct distance required between the back of combustible exterior wall covering and the external wall when furred out is 1-5/8". This measurement aligns with building codes and safety regulations aimed at preventing potential fire hazards.

When furred out, the space serves as a ventilation gap, allowing for air circulation behind the wall covering, which helps to reduce the chances of moisture accumulation that can lead to mold growth and structural decay. Furthermore, maintaining this specific distance also contributes to fire safety by creating a buffer zone. In the event of a fire, having a sufficient gap allows for heat dissipation and can help prevent the spread of flames from the exterior wall covering to the structural components of the building.

Understanding this measurement and its importance will aid in ensuring compliance with building codes and enhancing the overall safety of the structure.