How does water enter behind the EIFS?
Interfaces between EIFS and dissimilar materials are a common source of water intrusion, not the EIFS lamina (base and finish coats). The most frequent source of water intrusion is windows. Water frequently enters the EIFS at window locations via two ways: 1) either the joint around the perimeter of the window; 2) through seams and joints in the window construction itself. Large quantities of water that can result in some of the most severe damage have frequently been discovered entering behind where a roof meets and terminates at the lower edge in a wall. Other potential sources of water intrusion are chimneys, decks and any other penetration of the EIFS lamina.
