Concrete is one of the most durable and widely used materials in residential construction, but even the strongest surfaces can develop cracks over time. While some cracking is inevitable due to the nature of concrete, not all cracks are created equal. Understanding the difference between harmless surface cracks and signs of a more serious issue can help you protect your property and avoid costly repairs. Here’s a guide from Brothers Roofing and Construction, the Columbus concrete experts, to help you determine what’s normal and what’s not when it comes to concrete cracks.
Why Concrete Cracks Happen
Concrete is a rigid material that doesn’t flex or bend easily. As it dries, cures, and responds to changing temperatures, small shifts and shrinkage are bound to happen. That’s why even perfectly poured concrete slabs often show minor cracking over time. Other common causes include:
- Temperature changes (expansion and contraction)
- Moisture variations
- Heavy loads or impact
- Poor subgrade preparation
- Improper mixing or curing
Normal (and Harmless) Concrete Cracks
Some cracks, although not ideal, are common and typically not cause for concern:
- Hairline cracks: These small, shallow cracks sometimes appear during the curing process and usually don’t affect the structural integrity of the slab.
- Shrinkage cracks: Often found in driveways, walkways, and garage floors, these occur as the concrete loses moisture and hardens. They’re typically thin and stable.
- Surface crazing: This refers to a network of fine cracks on the surface, caused by rapid drying. While it may be unsightly, it’s usually cosmetic.
When to Worry About Concrete Cracks
While some cracks are normal, others may indicate underlying issues:
- Wide cracks (more than 1/4 inch): Larger cracks may be a sign of significant movement, settling, or poor subgrade support.
- Vertical displacement: If one side of the crack is higher than the other, this could signal settling or erosion beneath the slab.
- Expanding or widening cracks: Cracks that grow over time suggest that the problem is active and worsening.
- Cracks near support structures: Cracks in load-bearing areas or near the foundation should always be inspected by a professional.
What to Do If You Notice Cracking
Start by documenting the size and location of the cracks. Use a ruler to measure the width and monitor whether they grow over time. If the cracks appear stable and fall into the “normal” category, sealing them may be enough to prevent moisture infiltration and further deterioration. However, if you’re unsure or notice signs of serious movement, it’s best to call in a professional.
Let the Experts Help
At Brothers Roofing and Construction, we specialize in quality concrete installations for driveways, walkways, patios, garage floors and more. If you’re planning a new concrete project or replacing an aging surface, we’re here to help. Contact us today to learn more about your options and get started with a quote.
