Stucco is a popular exterior finish thanks to its durability, classic aesthetic, and energy efficiency. But like any material, stucco isn’t immune to wear and tear—especially when it comes to cracking. If you’ve noticed cracks forming on your stucco walls, you’re not alone.
In this blog, we’ll break down why stucco cracks, what types of cracks to watch for, and how to prevent them from happening in the first place.
Common Causes of Stucco Cracks
1. Foundation Movement
As your home settles over time, the foundation can shift slightly—causing stress on the stucco exterior. These shifts can result in vertical or diagonal cracks, especially near windows or corners.
2. Improper Installation
If stucco is applied too thick, too thin, or without proper curing between coats, it becomes more vulnerable to cracking. Poor workmanship or shortcuts during installation can lead to long-term issues.
3. Water Damage
Stucco is porous, and when not properly sealed, it can absorb moisture. This leads to swelling, mold growth, and ultimately—cracks from expansion and contraction.
4. Thermal Expansion & Contraction
Extreme temperature changes cause building materials to expand and contract. Over time, this constant movement stresses the stucco surface and creates hairline cracks.
5. Vibration & Impact
Everything from nearby construction work to slamming doors inside the home can contribute to cracks, especially if the stucco wasn’t reinforced correctly during application.
Types of Stucco Cracks to Look For
- Hairline Cracks: Thin, surface-level cracks that are usually cosmetic.
- Spiderweb Cracks: A web-like pattern often caused by poor application or quick drying.
- Diagonal Cracks: Often a sign of structural movement.
- Horizontal or Vertical Cracks: Can signal stress from foundation shifting or moisture intrusion.
How to Prevent Stucco Cracks
✅ Choose an Experienced Stucco Installer
Professional application is key. Always hire licensed contractors with a strong track record in stucco work.
✅ Use Control Joints
These are placed during installation to absorb movement and reduce cracking, especially on large wall surfaces.
✅ Seal and Maintain Regularly
Waterproof your stucco with a breathable sealant and inspect it yearly for signs of damage or wear.
✅ Allow Proper Curing Time
Each layer of stucco needs time to cure before applying the next. Rushing this step leads to weaker walls prone to cracking.
✅ Address Foundation Issues Early
If you notice interior or exterior signs of shifting, consult a structural expert before the damage gets worse.
When to Repair vs. When to Replace
Small hairline cracks can be patched and painted over. But if you notice deeper, expanding cracks—or signs of moisture damage—it may be time for a professional assessment or full reapplication.
Final Thoughts
Cracks in stucco are common but preventable. With the right materials, expert installation, and consistent maintenance, your stucco can stay strong and beautiful for decades.
Noticed a crack? Don’t wait.
Reach out to our team for a free inspection and keep your exterior in top shape!