Thinking of buying a home? The short answer is that it depends on which EIFS you are looking at and whether it has been inspected.
That is less satisfying than yes or no, and it is the honest position. EIFS installed one way is a perfectly sound wall system. Installed another way, it is the cladding that generated more construction litigation than any other product in the country. Both are in houses in Colorado right now, and from the curb, they look identical. Here is how to tell what you are dealing with.
EIFS and Stucco Are Different Products
Traditional stucco is cement, sand, lime, and water, applied over lath in three coats. It is heavy, hard, and cement-based. Our guide to stucco types covers the variations.
EIFS, Exterior Insulation and Finish System, is a layered assembly: expanded polystyrene foam board, a base coat with reinforcing mesh embedded in it, and an acrylic finish coat. The foam is the defining component, and it is why EIFS insulates where stucco does not. They look similar from the street. They behave nothing alike.
Stucco
Stucco is a cement-based cladding. It is one of the very common cladding options. It is a mix of natural ingredients and mesh; it is made of cement, sand, water, and lime. Stucco offers a wide range of textures and finishes. You can find a variety of stucco options, a wide variety of colors and textures. There are two main types of stucco systems, known as the 3-coat system and the 1-coat system.
Eifs
External Insulation and Finishing System(EIFS) is a kind of stucco, but it is very different from traditional stucco. It uses layers that add synthetic material to surfaces. The layers constitute polystyrene foam board, glass mesh, and a final finish. At first glance, it may appear similar to stucco, but it is actually a synthetic alternative to traditional stucco.
Barrier EIFS and Drainage EIFS
This is the distinction that decides whether a house is a problem.
Barrier EIFS was the original system, used widely through the 1980s and into the 1990s. It relied on the finish coat being watertight, with no drainage path behind the foam. Water that got in, usually around windows, doors, or penetrations, had nowhere to go. It sat against the sheathing and rotted it, often for years before anything showed on the surface.
That produced extensive moisture damage, major litigation, and a reputation that the product has never fully shed.
Drainage EIFS was developed in response and is what has been installed since the mid-1990s. It includes a water-resistive barrier behind the foam and a drainage plane that lets any water that gets in run out at the bottom. It is a sound system.
The practical question for a buyer: which one is in this house? Age is the first clue, since anything from the 1980s or early 1990s is more likely to be a barrier. But the only reliable answer comes from inspection.
How to Tell What You Have
Neither of these is conclusive on its own, and both are worth doing before you commission anything more expensive.
Knock on it. EIFS sounds hollow, because there is foam behind the finish. Traditional stucco sounds solid, like knocking on a wall.
Look at the edges. Check where the cladding meets a window, door, or soffit. EIFS is typically finished with a rounded or chamfered edge where the foam is wrapped. Traditional stucco tends to meet trim with a harder, squarer line.
Look for weep holes or a drainage track at the base of the wall. Their presence suggests drainage EIFS. Their absence does not confirm barrier, but it is worth noting.
What to Do Before You Buy
If the house has EIFS and you are serious about it, get an EIFS-specific moisture inspection. A general home inspection does not usually include one, and a visual check will not find water behind foam.
A proper inspection uses probe meters at the vulnerable points, which are the window and door perimeters, penetrations for hose bibs and lights, the base of the wall, and anywhere a deck or railing attaches through the cladding. An inspector can tell you whether the system has a drainage plane and whether moisture is present behind it. The cost of that inspection is small relative to what remediation costs would be if the sheathing has gone.
So Should You Buy It?
If the inspection comes back clean and the system is a drainage EIFS, there is no reason to walk away. It is an insulated, attractive, well-performing wall.
If it is barrier EIFS, or if moisture readings come back high, that is not automatically a deal-breaker either. It is a negotiation. Remediation can mean anything from reworking the flashing details at the windows through to full removal and replacement, and the number should be in your offer rather than discovered afterward. What you should not do is buy it untested on the assumption that stucco is stucco.
Looking at a House With EIFS?
We work on stucco and EIFS homes across the Denver metro, and we can tell you what you are looking at and what it would cost to put it right. Our stucco page covers what we install. Contact GS Exterior Experts, and we will come and look before you commit.
