Frequently Asked Questions

These comments are for general information only and are not intended to be relied upon as a guide for design, construction, or inspection of EIFS. Although every effort is made to ensure that this information is timely and correct, the responsibility remains with the designer, specifier, homebuilder, general contractor, and/or installer for specific applications. The specification, design, and construction of all EIFS must comply with local building codes and standards, applicable compliance reports and the individual manufacturer's system requirements. The successful performance of EIFS cladding is dependent upon the proper design and construction of the adjacent materials and systems of the structure.

The most frequently asked questions regarding EIFS fall into the following categories:

• Expansion Joints Sealants
• Design Considerations
• Flashing and Building Envelope Design
• Maintenance and Warranties

Below are a few FAQ’s about EIFS in general.

What does EIFS stand for?

EIFS is the acronym for Exterior Insulation and Finish Systems.

What is the definition of EIFS?

According to the definitions contained in the International Building Code and ASTM International, an Exterior Insulation and Finish System (EIFS) is a nonload bearing, exterior wall cladding system that consists of an insulation board attached either adhesively or mechanically, or both, to the substrate; an integrel="lightbox[restoration]"rally reinforced base coat; and a textured protective finish coat.

EIFS typically consist of the following components:

• A water-resistive barrier (WRB) that covers the substrate.
• The drainage plane between the WRB and the insulation board and is most commonly achieved with vertical ribbons of adhesive applied over the WRB.
• Insulation board typically made from expanded polystyrene (EPS), but can also be XPS or polyisocyanurate.
• An insulation board is attached with an adhesive or mechanically to the substrate.
• Glass-fiber reinforcing mesh embedded in the base coat.
• A water-resistant base coat that is applied on top of the insulation to serve as a weather barrier.
• A finish coat that typically uses colorfast and crack-resistant acrylic co-polymer technology.

When were EIFS invented?

In 1952, the first patent was granted for expanded polystyrene insulation board and in this same year, the first synthetic plaster was developed. In the late 1950s, EPS and synthetic resin materials were first used together. In 1963, EIFS were first marketed in Europe, and in 1969, EIFS were first introduced in the United States. They were first used on commercial buildings, and later, on homes.

Are EIFS in the building codes?

Since 2009, the International Building Code and International Residential Code, both published by the International Code Council, provide for, within the code itself, the use of Exterior Insulation and Finish Systems (EIFS).