Why EIFS damage stays hidden
EIFS (Exterior Insulation and Finish System) is a layered wall: a thin finish coat, a reinforced base coat, foam insulation board, and sheathing behind it. When water gets past the outer layers — usually at a window, door, roofline, or sealant joint — it can soak into the sheathing and framing while the finish on the outside still looks clean.
That's why by the time most homeowners notice a problem, water has often been getting in for a while. The good news: there are warning signs, and most of them are visible from the ground if you know where to look.
Rule of thumb: damage usually starts at the edges — around windows, doors, deck ledgers, roof-to-wall intersections, and anywhere something penetrates the wall. Start your walk-around there.
Warning signs on the outside
Staining below windows and roof lines
Dark streaks or tan/brown runs below window corners, kickout locations, and gutters often mean water is running where it shouldn't — and sometimes coming back out of the wall.
Cracks, especially at window corners
Diagonal cracks radiating from the corners of windows and doors, or long cracks along board joints, give water a direct path behind the finish.
Bulging, blistering, or delamination
A wall section that looks puffed out, wavy, or hollow when tapped can mean the finish or insulation is separating from wet sheathing behind it.
Failed or missing sealant
Sealant around windows, doors, vents, and light fixtures that is cracked, pulled away, or missing entirely is the single most common entry point we find.
Missing kickout flashing
Where a roof edge dies into a wall, a kickout flashing should divert water into the gutter. Without it, roof runoff is dumped straight into the wall below — often causing some of the worst damage on the house.
Mildew, algae, or persistent discoloration
Green or black growth that keeps coming back in the same spot suggests that area is staying wet longer than the rest of the wall.
EIFS running into the ground or mulch
Cladding that extends below grade or into landscaping can wick moisture up into the wall and gives insects a hidden path into the structure.
Warning signs on the inside
Interior clues often show up on the wall behind the damaged exterior area. Check window sills, trim, and baseboards on exterior walls for:
- Swollen, soft, or stained trim around windows and doors
- Peeling paint or bubbling drywall below window corners
- A musty smell in one room or near one wall
- Windows or doors that start sticking when they didn't before
- Water stains on subfloor or carpet tack strip along an exterior wall
The soft-spot test (and its limits)
Pressing firmly on the wall near a window corner can reveal a spongy or soft area where the sheathing behind has deteriorated. If you find one, that's a strong signal to call for an inspection.
But a wall that feels solid is not proof of a dry wall. Sheathing can hold a lot of moisture before it softens, and the foam layer masks what's behind it. That's what moisture testing is for — it measures what you can't feel.
What to do if you see these signs
Take photos
Photograph the area up close and from a distance so the location is clear. Note which rooms are on the other side of the wall.
Don't patch over it yet
Caulking or painting over a crack can trap water and hide the evidence an inspector needs to see. Hold off until the wall has been tested.
Send us the photos
Email or text what you're seeing. We'll tell you honestly whether an inspection makes sense before you pay for one.
