Concrete is one of the most widely used construction materials in the world. It’s durable, versatile, and strong. But even the toughest concrete isn’t immune to cracks, and those cracks aren’t just cosmetic. Understanding how they form and how to fix them is key to protecting the structure of homes and buildings in places like Spokane, Davenport, and throughout Washington State. At MTU Services LLC, our goal is to not only repair concrete but also educate homeowners on the science that drives its behavior.
What Causes Cracks in Concrete and How Are They Best Repaired?
Concrete starts as a liquid and hardens into a solid. During that process, called curing, it shrinks slightly. That shrinkage is one of the primary reasons cracks form in the first place. When water evaporates too quickly or the mixture dries unevenly, stress builds inside the slab. That internal stress needs to escape somewhere, and it often does through cracks.
But shrinkage isn’t the only culprit. Temperature changes, moisture in the soil, poor subgrade compaction, and even tree roots can all apply pressure on a slab or foundation. In Washington’s varied climate, this kind of stress is common. When the ground freezes and thaws or expands with moisture, it pushes on concrete, which can lead to cracking over time.
Not all cracks are created equal. Hairline cracks may seem harmless, but if they deepen or grow over time, they can open a path for water to seep into basements or crawl spaces. That moisture can lead to mold, weakened structures, or even pests. Wider cracks, especially those that shift or show signs of movement, are usually tied to foundation settling or shifting soil, and they should be taken seriously.
So, how should these cracks be repaired?
The best repair method depends on the type and severity of the crack. For minor cracks, flexible polyurethane or epoxy injections are often used. These materials not only seal the crack but can also help restore structural strength. For larger, shifting cracks tied to foundation issues, structural reinforcements or even underpinning may be needed to stabilize the foundation before sealing.
Another method involves routing and sealing, where the crack is widened and filled with a durable compound. This method is often used in sidewalks or driveways, but may not be ideal for structural concrete.
MTU Services LLC uses a range of professional-grade repair techniques based on what’s causing the cracks, not just what they look like on the surface. We evaluate factors like soil type, moisture levels, and previous construction work before deciding on the right approach. That’s especially important in areas like Eastern Washington, where seasonal changes and soil movement are common.
Preventing cracks before they happen is also possible. Proper drainage around the home, managing soil moisture, and allowing concrete to cure slowly and evenly can reduce the risk. But once cracks do appear, fast action is key. Early repairs not only extend the life of the concrete but also prevent bigger problems like structural damage or water intrusion.