Probably one of the most extensively tested exterior claddings is Exterior Insulation and Finish System or EIFS. (An acronym pronounced “eefs,” please don’t call it EFUS.) When you look at the basic components of an EIF system, you can see the simple design and minimal amount of parts required to complete this system. All of these parts fall under the warranty umbrella of one manufacturer and all are designed to be synergistic, operating as one unit, a system. However, the simplistic nature of EIFS may in fact be what concerns wary design professionals and contractors.