Home / Foundation Repair / Fixing Foundation Cracks from Outside

Fixing Foundation Cracks from Outside

A common problem you face is the Cracks in your home’s foundation, ceiling, and walls. So, It is obvious to address such issues with time to avoid further damage. The cracks might be from the inside or outside of your home. Never be careless about those foundation cracks.

This article will highlight some effective ways to repair foundation cracks from the outside. So, let’s start with the causes of these cracks. 

What causes foundation cracks from the outside?

Cracks are of two types: inside cracks and outside cracks. The cause of inner cracks is ground movement and concrete defects. At the same time, the cause of outside cracks is the weather change. Suppose the climate of any area is harsh. Then, it becomes damaging for homes because it causes cracks.

Besides, weather changes also affect the durability and performance of foundation and concrete. That is why you should address this issue as soon as possible to avoid further damage. 

Properly inspect outside foundation cracks

Before calling the professional, you should properly inspect the outside foundation cracks. This way, you can describe the issue and get an accurate quote. It helps you to avoid any unwanted surprises. 

Inspecting the inside of your house

You need to inspect the inner cracks as well. The outside cracks occur because of inside cracks. Ask the professional to use the right repair method according to the type of cracks. 

Surface or deep crack?

Try to remove a small patch from the outer crack. This way, you will know whether the whole wall is cracked or only plaster. 

Two-step repair: sealing and waterproofing

There are two-step processes to repair the outer foundation cracks. However, your home foundation is underground. So, a professional digs up the area via an excavator to clean the space. This way, he can find out the problem area. 

Sealing the crack

After the completion of the digging process, a professional cleans the crack and opens it in the V form. Then the expert applies cement and polymer-based sealant. The sealant must be elastic to avoid ground movement. 

Applying a protective lining

After the application of the sealant, the expert applies the primer. Then he installs a waterproof membrane that extends underground. The membrane is sealed using bitumen to avoid water infiltration.

Prepare the cracks for repair

Suppose the foundation cracks are larger than the hairline. Then the expert clears out materials like dust, dirt, debris, and concrete. For this, they use a flathead screwdriver and wire brush. For patch grip, you can use a hammer to widen these cracks and cut their edges. 

This way, you can give more area to the patch to adhere to and avoid its slipping. Once you have done this process, then clear the area using a wire brush. Rinse the cracks from a garden hose. Let this area dry for some time. 

Repair Hairline Cracks

Suppose your foundation cracks are just a hairline. Then you can use the vinyl concrete compound. If a manufacturer suggests you, then apply a concrete primer. It can create a strong bond between the surface and the patch. To apply liquid into cracks and on their sides, use an old or affordable brush. After using, wash this brush with soap or water. The best way is to discard it. 

Destruction in Reinforced Concrete Construction. Defects at the Junction of Structural Elements of the Wall

Besides, you have the option to add cement mixture in cracks if they are wide. For this, take a bucket, add ¼ cement and ¾ sand and water. Make a stiff paste of this mixture. In another container, add some cement and water to make cement paint. 

If it is possible, then paint the inner part of the cracks through the cement mixture. It acts as a primer. Then use a putty knife to add all the paste in the cracks to pack it. Use the trowel to straighten the mixture on all sides. Let’s allow the patch for an hour. After that, use a trowel on the entire surface in a circular motion. 

Repair Large Cracks

Suppose your foundation has larger cracks than the hairline. It is good to use silicone, concrete caulk, and polyurethane. Use a gun to apply the caulk throughout the whole length of the crack. Caulk is a very effective way to fill out the crack. It expands or contracts the foundation during weather changes. Once you have applied caulk, let this patch dry for some time. Suppose you notice that the entire crack is not filled. Then repeat this process. 

Crack on a wall of an old building

Another way is to use a putty knife to fill the cracks with hydraulic cement. According to the instructions, mix the cement with water in a bucket. For mixing, you should use a trowel. Stir this mixture until it becomes homogeneous. 

Wet the cracks using a spray bottle. After that, apply the cement mixture in the cracks with a putty knife. Let this patch dry for one hour. After one hour, apply another layer of mixture. To smooth these layers, use a trowel. 

Can I fix a foundation crack myself?

Yes, Though foundation cracks are common, you can repair these cracks yourself with professional help. While some cracks are large and wide that you can’t repair. For cracks more than ¼ inch wide, you need professional help. 

Should you fill in cracks in the foundation?

Yes, No matter what is the cause behind the foundation cracks? You always need to seal these cracks to avoid further issues. This way, you can protect the structural integrity and don’t allow water to enter the foundation. 

Can you fix horizontal foundation cracks?

Yes, The best way to fix horizontal cracks is the carbon fiber crack repair method. It is an inexpensive method and prevents sagging and major damage to the foundation. At the same time, some cracks are severe and require an expensive method to repair. 


Some cracks are minor, and you don’t need to worry about such cracks. At the same time, some cracks are major and stressful when the ground under your home shifts. However, these are not harmful to structural integrity. But these open up the way for groundwater, insects, and gas.

We have discussed some effective and inexpensive ways to repair foundation cracks. So, you can choose any of these methods and get rid of this issue. 

Check Also

Basement Crack Repair: Methods & Cost

Basement crack repair is a critical aspect of maintaining a structurally sound home. Your basement, ...

Leave a Reply

Your email address will not be published. Required fields are marked *