Basement floor crack repair isn’t always a one-size-fits-all project. Some cracks can be fixed with a simple DIY approach, while others call for expert attention. Small cracks can often be fixed with a simple DIY process that involves applying concrete crack filler. Other types of floor cracks, such as those caused by heaving, differential settling, or gaps along the basement wall and floor, often signal deeper foundation or moisture issues that require professional solutions.
If the crack you’re looking at is running through a foundation wall instead of the floor, our basement wall crack repair guide walks through that situation instead.
DIY Basement Floor Crack Repair Method for Simple Cases
This simple basement floor crack repair method works well for small cracks, and it can help block water seepage.
What Cracks Can You Repair With This Method?
Not every basement crack requires major structural repairs. Here are the types of cracks you can usually handle with this DIY approach:
- Hairline Cracks – These tiny cracks are common in newer homes and usually form as the foundation settles and dries. They’re typically less than 1/8 inch wide and don’t tend to grow over time.
- 1/8 inch Cracks – Slightly larger cracks often result from concrete shrinkage. Even small gaps like these can allow water to seep into your basement, so sealing them is important. If the cracks keep widening, that could be a sign of a deeper foundation problem. For cracks wider than 1/8 inch, we recommend having your foundation inspected by a professional.
Required Tools and Supplies
Before you begin, gather a few simple tools and supplies:
- Latex gloves
- Small trowel
- Wire brush
- Scraping device (like a screwdriver)
- Concrete crack filler
- TSP cleaning solution
- (Optional) Heat gun
Step-By-Step Guide
Here’s a step-by-step breakdown of the repair process:
- Clean and Dry the Surface – Scrub the crack and nearby area with a wire brush and cleaning solution such as TSP. Allow it to dry completely, or use a heat gun to speed things up.
- Remove Debris – Use a screwdriver or similar tool to scrape the crack and clear away any loose debris. Make a special effort in cleaning around the edges.
- Add the Crack Filler – Shake or stir the filler, then carefully insert it into the crack using the bottle’s spout. Work slowly until the entire crack is filled.
- Press the Crack Filler Into Place – With gloves on, use your finger to press the filler deeper into the crack. Wipe away any excess with your finger or a clean cloth.
- Spread the Crack Filler – Finally, smooth the filler evenly with a small trowel. Allow at least 24 hours for it to harden completely.
Other Types of Basement Floor Cracks and What to Do
Not all cracks are simple DIY fixes. Some types of basement floor cracks point to more serious issues that need professional attention.
Heaving Cracks
Heaving occurs when the ground beneath your foundation pushes upward. When the soil becomes overly saturated, the pressure it creates can be strong enough to lift and crack your basement’s concrete floor slab. This is especially true in areas with clay soil.
What to Do – Call a professional basement waterproofing and foundation repair company like EverDry Toledo to inspect the issue and recommend the best long-term solution.
Uneven Cracked Concrete Floors
Normal settling happens gradually as soil compacts under the home’s weight. But in more severe cases, differential settling occurs – meaning that different parts of the home sink at varying rates. This creates uneven, cracked surfaces in your basement, and if left unaddressed, foundation failure can occur.
What to Do – Have uneven concrete floors evaluated and leveled by a professional. EverDry Toledo can determine how serious the issue is and provide the right solution to protect your home’s foundation. Our foundation repair services are built for exactly this kind of structural fix.
Gap Between the Basement Wall and Floor
When a basement is constructed, the concrete floor slab and the foundation walls are poured at different times. They often don’t bond together as a single, continuous piece of concrete. Instead, a small gap is left where the two surfaces meet. That gap is what we call the cove joint. When the soil around your home becomes saturated and groundwater levels rise, water can filter through this opening.
What to Do – Applying sealant in the cove joint is only a temporary fix as it tends to crack over time. The most reliable solution is to install a basement waterproofing system that relieves hydrostatic pressure and keeps moisture out.
Frequently Asked Questions
Here are some common questions homeowners have about basement floor cracks.
Should Cracks in the Basement Floor Be Repaired?
It depends on the type of crack. Hairline cracks that don’t allow water in are usually just cosmetic and not a cause for concern. Larger cracks, typically 1/8 inch wide, can let in water, which may lead to moisture problems, so sealing them is recommended. Cracks that are significantly wider can signal foundation issues and should be repaired as soon as possible.
How Much Does It Cost to Fix a Cracked Basement Floor?
The cost depends on the size and severity of the crack. Small cracks, such as hairline cracks, can often be repaired for under $50 using DIY methods. Larger cracks or widespread damage can cost significantly more, especially if professional repair or structural work is needed.
Who Repairs Basement Floor Cracks?
You can usually repair small cracks yourself with basic tools and materials. For larger cracks or any cracks that keep expanding, it’s best to call a professional company like EverDry Toledo. We have the expertise to determine whether it’s just a surface issue or a sign of a deeper foundation problem.
How to Fix a Water Leak in My Basement Floor?
You can often stop a small water leak by sealing the crack with the right filler. However, if the water is caused by hydrostatic pressure or poor drainage issues, sealing alone won’t solve the problem. In that case, a basement waterproofing system may be needed to prevent future leaks and protect your home long-term.
When Should I Worry About Cracks in My Foundation Floor?
You should generally be worried when you see cracks that are significantly larger than 1/8 inch wide, or even when you see cracks that start small but are continuously expanding over time.
Schedule Your FREE 20-Point Inspection
If you’ve noticed large cracks, ongoing moisture, or signs that your foundation may be at risk, it’s time to call the experts at EverDry Toledo. Since 1986, we’ve provided homeowners across Ohio, Michigan, and Indiana with complete basement waterproofing and foundation repair solutions.
Schedule your FREE 20-point basement inspection today and get the peace of mind that comes with knowing your home is protected.
