In severe weather areas, how far must insulation for frost protection extend from the corner of the foundation?

In severe weather areas, insulation for frost protection is crucial to prevent freeze-thaw cycles that can compromise the integrity of a building’s foundation. The requirement for insulation to extend a specific distance from the corner of the foundation is determined by local building codes and best practices for frost protection.

The correct distance of 60 inches is based on the need to maintain consistent temperature in the soil surrounding the foundation. This distance ensures that the ground remains warm enough to prevent frost formation. Insulation acts as a thermal barrier, reducing heat loss from the ground and allowing for better moisture management.

Shorter distances would not provide adequate protection against frost, leading to potential foundation heaving or cracking. Extending insulation beyond this specified distance may not be necessary and could be cost-prohibitive. Hence, the requirement of 60 inches strikes a balance by ensuring foundational stability and avoiding excessive use of insulation materials.