Exterior insulation finish systems require corrosion-resistant flashing at what height?

Exterior insulation finish systems (EIFS) are commonly used in building construction to provide both insulation and a finished surface. One critical aspect of EIFS installation is the requirement for corrosion-resistant flashing at specific heights to protect against moisture intrusion and deterioration. The correct answer indicates that corrosion-resistant flashing is necessary at a height of 24 inches above grade.

This requirement is crucial because the area where the EIFS meets the foundation can be particularly vulnerable to water exposure from rain, snow, and ground moisture. The flashing serves as a barrier, directing water away from the building's envelope and reducing the risk of mold, rot, and structural issues that can arise from prolonged moisture contact.

By setting this height requirement, building codes ensure that there is adequate protection provided to the vulnerable transition areas between the EIFS and other building materials. Therefore, the choice of 24 inches aligns with established building practices aimed at maintaining the integrity and longevity of the exterior assembly.