An ice-and-water barrier laid down at the eaves should extend how far inside the wall line?

The most appropriate distance for an ice-and-water barrier to extend inside the wall line is 2 feet. This guideline is based on best practices for roofing and waterproofing, especially in climates prone to ice dams and heavy precipitation. Extending the barrier this far offers enhanced protection against water infiltration that can occur due to melting ice and snow accumulating at the eaves.

The barrier serves as a critical line of defense for vulnerable areas of the roof, helping to prevent moisture from penetrating the roofing system, which could lead to leaks, mold, and structural damage. By extending 2 feet into the wall line, it provides a sufficient overlap with the siding and underlayment, safeguarding the wall assembly from potential water damage that may occur during thaw and freeze cycles.

Adopting this practice reinforces the overall integrity of the roofing system, ensuring that it effectively sheds water and withstands the rigors of the weather, which is particularly essential in regions where such environmental conditions are common.