EIFS in North America North American builders began using EIFS in the 1980's, first in commercial buildings, then applying it as an exterior finish to residences--mostly wood frame houses--using the same techniques that had been successful in Europe.

There are three layers to EIFS

Inner Layer Foam insulation board that's secured to the exterior wall
surface, often with adhesive.

Middle Layer A polymer and cement base coat that's applied to the top of the
insulation, then reinforced with glass fiber mesh.

Exterior Layer A textured finish coat.

EIFS layers bond to form a covering that doesn't breathe. That's fine when
no moisture is present behind the covering, but if moisture seeps in it can
become trapped behind the layers. With no place to go, constant exposure to
moisture can lead to rot in wood and other vulnerable materials within the
home.

What had worked well as an exterior shell for concrete and stone became a
problem when used on wood. Moisture related problems lead to individual and
class action lawsuits by consumers.

Synthetic Stucco vs. Traditional Stucco

Synthetic stucco is soft and sounds hollow when tapped.

Traditional stucco is hard and brittle, and sounds solid when tapped.
Maintaining EIFS

Any opening, such as door and window frames and the areas around flashings,
must be sealed to prevent water from seeping behind the EIFS.
Gutters should be kept clean and positioned to drain away from the house.

Foam should not extend below grade.
Items that penetrate the stucco must be sealed.
In other words, no moisture should be able to seep behind the EIFS.

Signs of EIFS Problems

Mold or mildew on the interior or exterior of the home.
Swollen wood around door and window frames.
Blistered or peeling paint.
Cracked EIFS or cracked sealant.

EIFS TodayNewer EIFS systems include a drainage arrangement to help keep moisture from
being trapped behind the covering. Ask a trusted home builder for details
about contemporary EIFS.