My home has EIFS; what is it?

Typical 1st Generation EIFS

​Exterior Insulation and Finish System (EIFS):
Often called “synthetic stucco,” it became popular in the 1980s and 1990s as an attractive, energy-efficient siding. At first glance, it looks just like traditional stucco. But many homeowners have since learned that EIFS can create major problems if not installed or maintained correctly.

What is EIFS?
EIFS is made up of three layers:

1. Foam insulation board (usually expanded polystyrene)
2. A base coat with reinforcing mesh
3. Acrylic finish coat that mimics stucco

It’s lightweight, flexible, and energy-efficient. The problem? Early EIFS systems were designed as barriers to keep water out, trapping water rather than letting it escape.

The Big Problem:
Moisture Intrusion water gets behind EIFS through window flashing, roof connections, or wall penetrations; it has nowhere to go.
Unlike real stucco, EIFS does not “breathe.” This often leads to:

• Hidden wood rot in framing and sheathing
• Mold growth behind the walls
• Structural weakening that isn’t obvious until major damage occurs

Why It’s Hard to Spot?
Many homes with EIFS look perfectly fine on the outside. But beneath the surface, problems can be severe. In fact, the only way to know for sure is through specialized inspections using moisture scans and probes or infrared scans.

Common Installation Mistakes
Most EIFS failures come from poor installation, such as:

• No kick-out flashing at roof-wall intersections
• EIFS run down into the soil, allowing termites and moisture intrusion
• Improper caulking or missing sealants around windows and doors
• Lack of expansion joints for movement

Termite and Pest Issues
In termite-prone areas, EIFS can conceal termite activity because the foam board makes tunneling easy, and damage is hidden from view.

The Stigma Around EIFS Homes
Because of past lawsuits and widespread failures, many insurers refuse to issue new coverage on EIFS homes, and buyers are often wary due to the history of this material. This can reduce resale value and the length of time on the market compared to homes with brick, siding, or traditional stucco.

Can EIFS Be Fixed?
Yes — newer or second-generation EIFS systems include a drainage plane behind the foam to let water escape and tend to have less issues.
For older homes or first-generation homes:

• Professional inspection is a must
• Repairs may include replacing damaged sections, adding additional or missing flashing, and raising the EIFS off the roof lines and above the grade. Interior framing repairs from rotting substrates and framing
• In severe cases, full removal and re-cladding may be necessary

Final Thoughts
EIFS isn’t automatically bad — when installed correctly with proper drainage, it can perform well. But barrier EIFS homes (especially from the 1980s and 1990s) come with a high risk of hidden water damage. If you own or are considering buying one, schedule an impartial professional inspection to find out what’s behind the walls. Trace Inspections can provide this service.

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