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Synthetic stucco, Dryvit, “the styrofoam kind” — those all mean the same wall. If you knock on it and it sounds hollow with a little give under your knuckles, that is EIFS, and it is not repaired the way traditional stucco is repaired. Doing it the wrong way does more damage than leaving it alone.
Start here
EIFS stands for Exterior Insulation and Finish System. It is not stucco in the old sense of the word. There is no cement in the finish and there is no wire lath behind it — it is an insulated cladding, with foam board on the outside of the building and a thin reinforced skin troweled over the top of it.
The foam is stuck to the sheathing with an adhesive, or held with mechanical fasteners, or both. What is underneath is usually plywood or OSB sheathing, sometimes gypsum board or masonry.
Rigid EPS board, often an inch or more thick. This is the styrofoam people are talking about. It carries the insulation value, and it is also what gets shaped into the bands, cornerstones and window surrounds you see on EIFS buildings.
A thin polymer base coat troweled over the foam with a fiberglass mesh embedded in it. The mesh is what gives the skin its impact strength. The whole layer is measured in sixteenths of an inch, not in the three‑eighths you get from one coat of cement plaster.
Colored all the way through and textured to whatever pattern was chosen. It is flexible by design, and it can be matched later in both texture and color — which is the whole reason a good EIFS repair can disappear into a wall.
On a hard‑coat wall, a water‑resistive barrier goes over the sheathing, metal lath is fastened through it into the framing, and three coats of Portland cement plaster are built up on that lath — scratch, brown, then finish. That wall is close to an inch of masonry. It is heavy, it is rigid, and it hangs on the lath.
EIFS is a fraction of that weight and it is glued to the building rather than hung on it. Two different walls. Two different sets of rules for fixing them. If what you have is the hard kind, traditional stucco repair is the page you want.
| Traditional three‑coat | EIFS | |
|---|---|---|
| Made of | Portland cement, sand and lime | EPS foam, polymer base coat, acrylic finish |
| Held on by | Metal lath fastened to the framing | Adhesive, fasteners, or both |
| Thickness | About seven‑eighths of an inch of plaster | Foam board plus a skin a few sixteenths thick |
| How it moves | Rigid — relieves movement by cracking | Flexible — moves with the building |
| Knock test | Hard, solid thud | Hollow, with a little give |
| Repaired with | Cement‑based patching, matched to texture | EIFS materials only — base coat, mesh, finish |
Straight talk
That is the single most useful sentence on this page. If someone has troweled a cement patch onto a synthetic wall, that patch is going to fail — and the wall behind it will be in worse shape than before anyone touched it.
Cement is rigid. EIFS is flexible — the foam and the acrylic skin expand and contract in the sun, and a cement patch will not follow them. The joint between the two opens up, usually inside the first year, and it opens all the way around the patch.
A cement patch takes water in and holds it. The acrylic finish either side of it lets very little vapor through. So whatever that patch soaks up has nowhere to go but sideways and inward — into the foam, and into the sheathing behind it.
That is the real damage. A hard patch over EPS seals water in against the sheathing instead of letting the wall dry. The next failure is not a cracked patch. It is rotted wood you cannot see, and it costs many times more to put right.
Two generations of the same system
Not all synthetic stucco is the same age or the same design, and the difference decides how a repair has to be built.
Older EIFS was built as a barrier. The idea was that the finish coat and the sealant joints would stop every drop of water at the surface, so nothing behind the wall would ever need to drain. That holds up right until one sealant joint fails or one flashing is missed — and then the water has no way out, because the system was never given one. Modern EIFS is built to drain instead: a water‑resistive barrier over the sheathing, a drainage cavity behind the foam, and a path for anything that gets in to come back out at the bottom of the wall. The code moved with it. The IRC now requires EIFS to be installed over a water‑resistive barrier with a means of drainage (R703.9.2), and the drainage efficiency of the assembly is tested to ASTM E2273. If your house went up before that changed, there is a fair chance you have the face‑sealed kind — and that is worth knowing before anybody cuts into it.
The practical difference on a repair: on a drained system, the drainage path has to stay continuous when we close the wall back up, or we have just built a face‑sealed patch into a drained wall. On a face‑sealed system there is no path to protect, so every detail we correct — flashing, sealant, terminations — is doing all of the work by itself.
The part people are afraid of
A lot of people in the Southeast hear “synthetic stucco” and think lawsuit. That reaction was earned. In the mid‑1990s, moisture problems in EIFS‑clad houses in coastal North Carolina turned into class actions, conventional face‑sealed EIFS was pulled out of new residential construction there in 1996, and the story travelled. Thirty years later it is still the first thing a lot of homeowners in Alabama, Mississippi, Tennessee and Louisiana say when the subject comes up.
Here is the honest version of what went wrong. The failures were overwhelmingly a detailing problem — flashing left out or installed backwards, sealant joints that were never maintained, missing kick‑out flashing where a roof runs into a wall — sitting on top of a face‑sealed design that gave the water no route back out once it found a way in. It was not that foam and acrylic are bad materials. Plenty of EIFS from that era is still on buildings and still perfectly sound, because on those buildings the flashing was done right and the joints were kept up.
The industry’s answer was drainage, and it was the right answer. Drainage does not make the details optional — it makes them survivable, which is a different and much better thing. So if you have been told your house is a liability because it has synthetic stucco on it: that is not the finding. A drained system, detailed properly and kept sealed, is a good wall. A face‑sealed wall with sound flashing is also a good wall. What matters is which one you have and what condition the details are in.
Where this leaves an older EIFS house. Age on its own is not the problem. Open joints at windows and doors, a missing kick‑out at the roofline, staining that spreads after rain, soft or bulging spots low on a wall — those are the problem, and they are all fixable. Send us a photo and we will tell you which of them you are looking at.
How the work goes
Every step below exists because the wall is a system. Skip one and what you have bought is cosmetic — it will look right for a season and fail in the same place.
Before anything gets cut, we work out what we are dealing with: face‑sealed or drained, how thick the foam is, what the finish texture and aggregate size are, and where the joints and terminations run. The repair has to go back as the same system. Mixing two systems in one wall gives you a seam that will always be the weak point.
We open the area past the failure — out to where the base coat is still stuck fast to the foam and the mesh is still sound. Cutting to the edge of what you can see almost always leaves wet material inside the wall. The cut is squared up and the edge is prepared so new mesh can lap onto the old.
EPS that has been sitting in water does not dry out inside a wall in this climate. It comes out, and so does any sheathing behind it that has gone soft. New board goes in flush with the surrounding foam and gets rasped level, because any high or low spot telegraphs straight through the finish and shows up the first sunny afternoon.
New base coat, new fiberglass mesh, lapped several inches onto the existing mesh on every side so the repair is tied into the wall rather than sitting in a hole in it. The mesh has to be fully embedded — if you can still see the weave through the base coat, it is not embedded, and that is exactly where the next crack starts.
This is the step that decides whether the repair lasts. Almost every EIFS failure traces back to a joint, a termination or a piece of flashing rather than to the field of the wall. We re‑seal where the cladding meets windows, doors, outlets, light fixtures and hose bibs; we check that the kick‑out flashing is there where the roof runs into the wall, throwing runoff into the gutter instead of behind the cladding; and we make sure the bottom of the wall is terminated so water that does get in can get back out.
Acrylic finish over the repair, worked to the same texture as everything around it — pattern and aggregate size both, not just color. Color gets matched on the wall in daylight, never off a chip indoors. On an elevation that has faded over twenty years, the honest answer is sometimes to recoat the whole wall rather than chase a match across it, and we will say so if that is where we land.
A full recoat goes on with an elastomeric acrylic coating. Elastomeric means it stays flexible: it bridges hairline cracks instead of splitting over them the way ordinary house paint does. It sheds water while still letting the wall dry outward, so moisture already in the substrate is not sealed in. And it holds color and resists mildew and algae, which matters in this humidity. You can keep your existing color or change it.
Not sure which one you have
Knock on the wall with your knuckles. Traditional stucco gives back a hard, solid thud — you are hitting the better part of an inch of cement. EIFS sounds hollow and has a little give, because you are pressing on foam. Then look at the trim: bands, cornerstones and window surrounds that are all one piece with the wall, with no joint where they meet it, are shaped foam — and shaped foam means EIFS.
Send a photo and we will tell you what you are looking at — what system it is, what is likely causing it, and whether it needs doing now.
