Why Is the Stucco On My House Cracking?
Stucco is a popular exterior finish for homes due to its durability, classic look, and low maintenance. However, over time, many homeowners notice cracks forming in their stucco siding. If you’ve asked yourself, “Why is the stucco on my house cracking?”—you’re not alone.
In this blog, we’ll explain the common reasons for stucco cracking, what types of cracks to watch out for, and how to fix or prevent them. Let’s get started.
1. What Is Stucco?
Stucco is a cement-based plaster applied over walls and other surfaces. It’s often used for exterior siding and consists of cement, sand, lime, and water. Once it dries, stucco forms a solid, protective shell.
2. Is It Normal for Stucco to Crack?
Yes, minor stucco cracks are quite common. As homes settle or go through seasonal changes, the material can expand and contract. However, frequent or large cracks may signal deeper issues that require attention.
3. Common Reasons Why Stucco Cracks
Here are the most typical causes:
a. Improper Installation
If the stucco wasn't applied correctly, it may not adhere well to the surface, leading to early cracking.
b. Foundation Settlement
As the foundation settles, it can cause stress on the stucco, especially around windows and doors.
c. Moisture Damage
Water infiltration behind stucco can weaken the structure and cause bulging or cracking over time.
d. Temperature Fluctuations
Extreme weather, especially in Alberta, causes expansion and contraction that puts pressure on stucco walls.
e. Lack of Control Joints
Control joints allow for movement. If they weren’t installed properly, the stucco has nowhere to flex, so it cracks instead.
4. Types of Stucco Cracks
– Hairline Cracks
Very thin, usually cosmetic, and common. They often appear after the initial curing process.
– Spider Cracks
Look like spiderwebs and often result from poor installation or rapid drying.
– Diagonal Cracks
Usually found around windows and doors and can indicate structural movement.
– Cracks with Staining
This may mean moisture is trapped behind the wall—something that should be fixed right away.
5. When Should You Worry About Stucco Cracks?
You should be concerned if:
- Cracks are wider than 1/16 inch
- Cracks continue to grow over time
- You notice water stains or mold
- The cracks run diagonally or vertically
These signs might indicate moisture damage or foundation issues.
6. How to Repair Stucco Cracks
Small hairline cracks can be filled with caulk or patch material. For larger or spreading cracks, it’s best to consult a professional who can assess the structural integrity and recommend the right fix.
7. Preventing Future Stucco Cracks
- Ensure proper drainage to avoid moisture buildup
- Seal around windows and doors
- Schedule regular inspections
- Use flexible paint or sealants to allow expansion and contraction
8. Why Professional Stucco Inspection Matters
Ignoring stucco cracks may lead to water damage, mold growth, or reduced home value. A professional can identify the root cause, whether it’s installation flaws, foundation issues, or moisture behind the walls.
9. Live in Alberta? Book Stucco Inspection Today
If you live in Alberta and are noticing cracks on your stucco walls, don’t wait until it turns into a costly repair. At albertapargin.ca, we specialize in stucco inspection, repair, and property maintenance services that protect your home for the long run.
? Click here to book an inspection or consultation.
10. Conclusion
Cracks in stucco can be harmless—or a sign of something more serious. The key is to understand the cause and address it early. Whether you need minor repairs or a full inspection, professional help ensures your home stays beautiful and damage-free.
Have questions or need expert advice? Contact us today and keep your home’s exterior in top condition.
