What Are Expansion Joints and Why Do They Matter?

If you've ever looked closely at your driveway, sidewalk, or patio, you've probably noticed the straight lines or gaps between sections of concrete.

These are called **expansion joints**, and they're an important part of how concrete is designed to perform over time.

Many homeowners don't think much about them until weeds begin growing through them or they notice the joint beginning to separate.

Understanding what expansion joints do—and how to maintain them—can help Spokane homeowners protect their concrete for years to come.

What Is an Expansion Joint?

Concrete naturally expands and contracts as temperatures change.

Expansion joints provide space for that movement to occur without placing unnecessary stress on the surrounding concrete.

Without properly functioning joints, concrete may be more likely to develop unwanted cracking as it responds to changing conditions. For more on what to watch for, see When Should You Be Concerned About Cracks in Concrete?.

Why Are Expansion Joints Important?

Expansion joints help:

• Allow normal movement
• Reduce stress within the concrete
• Separate adjacent slabs
• Help manage moisture between slabs
• Support long-term performance

Although they're easy to overlook, expansion joints play an important role in many concrete installations, from driveways to sidewalks.

Spokane's Climate Makes Them Even More Important

Throughout the year, Spokane experiences:

• Summer heat
• Winter snow
• Freeze-thaw cycles
• Seasonal moisture

As temperatures rise and fall, concrete naturally responds to those changes.

Expansion joints help accommodate that normal movement.

Common Problems Homeowners Notice

Over time, expansion joints may collect:

• Dirt
• Leaves
• Weeds
• Standing water
• Debris

If left unattended, these materials can trap moisture and make routine maintenance more difficult. Persistent moisture in and around joints is one factor discussed in Why Water Is Pooling on Your Driveway.

Simple Maintenance Tips

Homeowners can help keep expansion joints functioning by:

• Removing weeds
• Cleaning out accumulated debris
• Monitoring for standing water
• Watching for widening gaps
• Inspecting joints during spring and fall maintenance

Routine observation often makes it easier to identify gradual changes. For a broader seasonal routine, see our Spring Concrete Inspection Checklist, and for more preventive habits, review 10 Ways Spokane Homeowners Can Help Prevent Concrete Settlement.

When Should You Pay Attention?

It's worth taking a closer look if you notice:

• One slab settling noticeably lower than another
• Water consistently collecting in a joint
• Large gaps developing
• Nearby trip hazards
• Joint material deteriorating significantly

These conditions don't automatically mean major repairs are needed, but they may indicate that further evaluation is worthwhile.

Frequently Asked Questions

Are expansion joints supposed to have gaps?

Yes. The space allows concrete to expand and contract as temperatures change.

Should weeds be removed?

Removing weeds and debris helps keep joints cleaner and makes routine inspections easier.

Does Spokane's weather affect expansion joints?

Yes. Seasonal temperature changes and freeze-thaw cycles contribute to normal concrete movement throughout the year.

Should I inspect expansion joints every year?

Spring and fall are excellent times to include them in your regular concrete inspection.

Final Thoughts

Expansion joints may seem like a small detail, but they play an important role in the long-term performance of driveways, sidewalks, patios, and other concrete surfaces.

By keeping them clean, monitoring seasonal changes, and including them in your routine property maintenance, Spokane homeowners can better understand how their concrete is performing and identify changes before they become larger concerns.

If you'd like a professional evaluation of your concrete, contact Spokane Concrete Leveling to schedule a free estimate.