Stucco is one of the most durable and attractive finishes for a home’s exterior. Its clean look, fire resistance, and insulation properties make it a favorite choice among homeowners and builders alike. But despite its toughness, stucco is not invincible. Over time, exposure to the elements, moisture, and structural movement can cause stucco to crack, crumble, or fail.
The key to preserving your home’s stucco exterior is spotting damage early—before it spreads or leads to costly repairs. In this blog, we’ll walk you through how to identify signs of stucco damage and what they mean for your home.
Why Early Detection Matters
When stucco damage goes unnoticed or untreated, it can lead to serious problems such as:
- Water infiltration behind the walls
- Mold and mildew growth
- Rotting sheathing or framing
- Increased energy bills due to poor insulation
- Decreased home value
The good news? Most stucco damage starts small—and if you know what to look for, you can catch it early and prevent major repairs down the line.
1. Look for Cracks – And Know What They Mean
Cracks are the most common sign of stucco damage, but not all cracks are created equal. Understanding the type and size of crack can tell you a lot about the problem:
- Hairline Cracks (less than 1/16 inch): These are usually caused by minor settling or temperature changes and are often harmless if caught early. However, they should still be sealed to prevent water intrusion.
- Spiderweb Cracks: These look like a net or spiderweb and are usually caused by improper mixing or application during installation. If widespread, the affected area may need resurfacing.
- Diagonal or Stair-Step Cracks: These often indicate foundation movement and can be more serious. They usually require professional inspection to determine the underlying issue.
- Wide Cracks (1/8 inch or more): Cracks of this size may allow significant moisture into the wall system and often point to deeper structural or water issues.
2. Watch for Discoloration or Staining
Dark streaks, rusty spots, or greenish stains on stucco can indicate water damage or algae growth. Common causes include:
- Faulty gutters or downspouts
- Improper flashing around windows and doors
- Poor drainage near the foundation
- Water splashing up from hard surfaces like concrete or pavers
Discoloration can be a cosmetic issue—or a red flag for trapped moisture. A moisture test may be needed to check what’s happening beneath the surface.
3. Tap the Surface – Do You Hear Hollow Spots?
One trick professionals use is gently tapping the stucco with a hard object like a screwdriver handle. If you hear a hollow sound, the stucco may be detached from the lath or sheathing behind it. Hollow spots can indicate delamination, which occurs when moisture or structural movement causes the layers to separate.
If ignored, delaminated stucco can crack and fall away from the wall, exposing your home to further water damage.
4. Check Around Windows, Doors, and Rooflines
These areas are especially vulnerable to stucco failure due to water runoff and improper sealing. Look for:
- Cracking or separation at the corners
- Gaps in the caulking
- Stains or water trails
- Bubbling or warped paint inside the home (a sign of hidden leaks)
Even small gaps around these openings can let water seep behind the stucco system, so it’s important to inspect them regularly and maintain proper sealing.
5. Monitor the Inside of Your Home
Stucco problems often show warning signs indoors first—especially when moisture is trapped behind the walls. Be on the lookout for:
- Musty odors
- Peeling paint or bubbling wallpaper
- Damp spots on walls or ceilings
- Warped baseboards or flooring
These symptoms suggest that water is getting in somewhere and may be causing hidden damage. Professional moisture testing and infrared scanning can help pinpoint the problem area.
6. Efflorescence – A Subtle Clue
Efflorescence is the white, powdery residue that can appear on the surface of stucco. It’s caused by water evaporating and leaving behind salt deposits. While it might seem like a cosmetic issue, efflorescence can indicate persistent moisture problems and poor drainage behind the wall.
Cleaning it off may temporarily improve the look, but the source of the moisture must be addressed to prevent it from returning.
What to Do If You Spot Stucco Damage
If you notice any of these warning signs, don’t panic—but don’t wait, either. Small repairs can be handled quickly and affordably, but the longer you wait, the more extensive the damage (and cost) may become.
Here are your next steps:
- Document the damage with photos and notes.
- Schedule a professional stucco inspection if you’re unsure of the severity.
- Seal minor cracks and re-caulk vulnerable joints while awaiting professional help.
- Ensure your gutters, flashing, and roof are in good shape to prevent future moisture intrusion.
Final Thoughts
Stucco is strong—but even the strongest exterior needs attention. Learning how to spot stucco damage early puts you in control and helps you maintain your home’s appearance, efficiency, and value.
If you’re ever in doubt, reach out to a qualified stucco contractor for an inspection. Regular maintenance and timely repair are the keys to keeping your stucco in top shape for years to come.