How to Fix Cinder Block Foundation

Cinder block foundations are a common and popular option for home construction because they are sturdy and relatively inexpensive. They are affordable, durable, and easy to construct. However, they are not without their drawbacks. One of the most common problems with cinder block foundations is that they can leak water. This can cause extensive damage to your home if it is not fixed quickly.

How to Fix Cinder Block Foundation

If not correctly maintained, cinder block foundations can deteriorate and cause structural damage to your home. In this blog post, we will show you how to fix cinder block foundation and restore it to its former glory. So, whether your foundation is uneven, cracked, or has other structural issues, follow these easy steps to get it back in shape!


If you have a cinder block foundation, it’s important to fix any cracks or damage as soon as possible. The best way to repair a cinder block foundation is first to use a chisel and hammer to remove any loose or crumbling blocks and then fill the gaps with mortar.

You can also use cement grout to fill in large cracks in the wall and to reinforce old mortar joints that are weak or deteriorating. It’s important to let the cement dry before you proceed with repairs, which may require using steel reinforcement rods, anchor bolts, or other structures. Once everything is set, caulk around the entire brick wall for insulation and waterproofing.

8 Effective Methods on How to Fix Cinder Block Foundation

Method 1: Use an Epoxy-Based Concrete Repair Mortar

If your cinder block foundation is cracked or has voids, you can use an epoxy-based repair mortar. This product is designed to fill cracks and gaps in concrete, so it’s perfect for repairing your cinder block foundation.

To use this method, simply mix the repair mortar according to the manufacturer’s instructions and apply it to the cracks or voids in your foundation. Once it dries, it will provide a substantial, durable repair lasting for years.

Method 2: Use a Concrete Patching Compound

Another option for repairing cracks in your cinder block foundation is to use a concrete patching compound. These products are available at most hardware stores and home improvement centers, and they’re relatively easy to use.

First, you need to clean out the crack in the foundation with a wire brush. Be sure to remove any loose concrete or debris so that the patching compound will adhere properly. Next, you’ll need to wet the area with a garden hose or water source.

Once the area is wet, you can apply the patching compound according to the manufacturer’s instructions. You’ll likely need to apply a compound layer over the crack and then use a trowel or putty knife to smooth it out.

After the patching compound has dried, you can paint over it to match the rest of your foundation.

Method 3: Use Hydraulic Cement

Hydraulic cement is very popular among homeowners and is used to fix small to medium cracks in concrete, including cracks in cinder block foundations. This type of cement expands as it dries and creates a watertight seal.

Begin by mixing the hydraulic cement with water according to the package instructions. Next, use a trowel to apply the hydraulic cement to the crack. Be sure to fill the crack and smooth it out, so it is level with the rest of the foundation.

Allow the cement to dry for at least 24 hours before painting or sealing it.

Hydraulic Cement is Very Popular

Method 4: Use a Concrete Floor Leveler

If your cinder block foundation is cracked and uneven, you can use a concrete floor leveler to fix it. This product is available at most hardware stores and home improvement centers.

To use this method, simply mix the floor leveler according to the manufacturer’s instructions and apply it to the cinder block foundation with a trowel. Once dry, you can paint or stain the foundation to match the rest of your home’s exterior.

Method 5: Use Polyurethane Concrete Crack Injection Kits

If you’re looking for a more permanent solution, you can look for a polyurethane concrete crack injection kit. You will find these at your local home improvement store or online.

These kits come with a tube of polyurethane resin and an activator that you mix. Once mixed, you simply inject the mixture into the cracks in your foundation using a caulk gun. The resin will expand and fill the cracks, creating a waterproof seal.

While this method is more expensive than the others, it will create a permanent fix for your foundation cracks.

Look for a Polyurethane Concrete Crack Injection Kit

Method 6: Use Fiberglass Reinforced Tape

If you have small cracks in your cinder block foundation, this method is very effective. All you need is some fiberglass reinforced tape, which can be found at any hardware store. Simply apply the tape over the crack, and smooth it out, so there are no bumps or air pockets. This will prevent water from seeping through the cracks and causing further damage.

Method 7: Use Caulking

Using caulking is a standard method to fix cinder block walls. You need to clean up the surface before applying it to the caulk. Then, use a caulking gun to apply a sealant to cracks or gaps. Use a putty knife to spread the caulk evenly. This method is most effective for small gaps and cracks. Be careful with the caulking you use; too much can cause damage.

Using Caulking is a Standard Method

Method 8: Use a Foundation Repair Kit

If the cracks in your cinder block foundation are more significant, you may need to use a foundation repair kit. There are many different types of foundation repair kits available on the market. Choose one that is designed explicitly for cinder block foundations. Follow the instructions included with the kit to repair the cracks in your foundation.

If you are not comfortable handling repairs to your cinder block foundation yourself, you can always hire a professional. A professional can assess the damage and make the necessary repairs. This is usually the best option for major damage to your foundation.

Hiring a professional is also a good idea if you have cracks that keep reappearing. A professional can determine the cause of the cracks and make permanent repairs. This will save you time and money in the long run.

When it comes to repairing or fixing cinder block foundations, many options are available. Choose the best option for your particular situation. With a little work, you can have your foundation repaired and back to normal.

Use a Foundation Repair Kit

How to Repair Cracks in a Cinder Block Foundation

First, inspect the foundation for cracks. Then, clean the cracks with a wire brush and a vacuum.

Next, fill the cracks with mortar using a pointing trowel. Finally, allow the mortar to dry for at least 24 hours before continuing.

If you have a cinder block foundation, it’s important to inspect it regularly for cracks. Cracks can occur for various reasons, including settling, water damage, and seismic activity.

If you do find cracks in your cinder block foundation, it’s important to repair them as soon as possible. Left unrepaired, cracks will only get bigger and can lead to serious structural damage.

How to Fix a Leaning Cinder Block Foundation

Cinder block foundations are one of the most common foundations used in homes. They are known for their durability and strength. However, over time, they can start to lean or shift. If you notice your cinder block foundation beginning to lean, it’s important to take action immediately. If left unaddressed, the problem will only worsen and eventually lead to structural damage.

There are a few different ways that you can fix a leaning cinder block foundation. One option is to use steel plates and bolts to secure the foundation. Another option is to use piers to support the foundation and prevent it from shifting.

Finally, you can also choose to excavate the foundation and pour a new one completely. This is often the best option but also the most expensive.

Whatever option you choose, it’s important to get professional help. Trying to fix a leaning cinder block foundation on your own can be dangerous and can make the problem worse.

Use Piers to Support the Foundation

How to Waterproof a Cinder Block Foundation

If your cinder block foundation is not currently waterproof, you’ll need to take some steps to ensure that it is. Fortunately, waterproofing your cinder block foundation is a relatively easy process that anyone can do.

The first step is to identify any cracks or holes in the foundation. These need to be repaired before you can waterproof the cinder block foundation. You can use a mortar repair kit to fill any cracks or holes. Once the cracks and holes have been filled, you’ll need to apply a waterproofing sealer to the entire foundation. This can be done with a brush or roller.

Once the sealer has been applied, you’ll need to wait for it to dry. Once it’s dry, you can apply a second coat of sealer if desired.

Once the sealer has dried, your cinder block foundation should be fully waterproof. This will help protect your home from water damage and keep your basement or crawlspace dry.

Protect Your Home From Water Damage


A cinder block foundation is a popular and affordable way to build a foundation for a home. However, if not done correctly, it can lead to problems. 

If you are considering building your home on a cinder block foundation, be sure to follow these methods on how to fix cinder block foundation to ensure that your foundation lasts for years to come.

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