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INTRODUCTION: Exterior Insulation and Finish Systems (EIFS) have been used successfully<br />
for over 50 years in the US. It is an exterior wall cladding that is light weight, flexible,<br />
durable and adds energy saving insulation to the wall. The insulation can be shaped to<br />
easily provide architectural details. There are a vast choice of finish textures and colors<br />
available. The continuous reinforced lamina over the insulation makes this a face-sealed<br />
system. Standard EIFS do not require a weather or moisture-resistive barrier behind them<br />
because they are a facesealed cladding. Windows, doors and other objects do pass through<br />
the exterior wall. Proper flashing and sealants at those penetrations effectively protect the<br />
entire assembly from exterior water penetration. All the components of the EIFS are also<br />
user and environmentally friendly. All the liquid and paste materials are water-based. This<br />
chemistry provides a vapor permeable, breathable exterior that will allow incidental water<br />
in an exterior wall assembly to easily dry out.<br />
If a water-resistive barrier is requested by an architect or owner, or required by code behind<br />
a classic EIFS, Parex USA has several, tested, “Drainage” EIFS to choose from. One is designed<br />
for use with Light Commercial and Residential (LCR) construction that typically uses wood<br />
framing and sheathing. The other is designed for commercial construction that typically uses<br />
steel framing with a noncombustible gypsum or cement based sheathing. These Commerical<br />
Drainage EIFS are installed exactly the same as the Standard Systems. The difference is that<br />
the Commerical Drainage Systems require additional materials and application steps on the<br />
substrate and rough openings prior to the actual EIFS installation.<br />
This guide begins with a list of products that will be used for various segments of the<br />
three systems outlined. The second section of the guide covers General Installation<br />
Requirements. The third section describes the application of Standard EIFS from insulation<br />
board attachment through application of finish and sealants. The fourth section covers the<br />
treatment of the substrate and rough openings. The fifth section covers the substrate and<br />
rough opening treatments required for the Commercial Drainage EIFS.
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