ISO 17738-4:2026

This document provides the requirements for site verification of an exterior insulation and finish system (EIFS) compliant with ISO 17738-1, installed in compliance with ISO 17738-2, and designed in compliance with ISO 17738-3. Site verification verifies that the on-site EIFS installation comprises materials and products in accordance with ISO 17738-1, is being installed as per ISO 17738-2, and incorporated details are compliant with (i) ISO 17738-3, and (ii) in accordance with the manufacturer’s printed installation instructions. This document also covers off-site manufacture of EIFS panels which are then transported to and installed on site. This document can be used as part of a building envelope commissioning process.