8 tips for repairing a foundation crack

Over time the foundation on your home page will slowly begin to lớn show signs of aging, the same way that we vày when we get older. From the weight of the trang chủ sitting on it lớn the changing weather each season, the foundation puts up with a lot.

You watching: 8 tips for repairing a foundation crack

When it comes khổng lồ foundation cracks, the most common type that you’ll likely see is a vertical crachồng that is caused by shrinkage & from the home settling. They can occur due to concrete tension, và become most visible during the first few years of construction.

Most foundation cracks can be easily fixed, even by a do-it-yourselfer, for a fraction of the cost that you would pay a professional contractor. Understanding what type of craông chồng you are dealing with is crucial to lớn maintain the structure of the home.

Are Cracks in Foundation Normal?

Foundation cracks, for the most part, are normal và shouldn’t be a cause for an alarm. Foundations craông chồng naturally due to aging or deterioration of the concrete, or from trang chính settling over time.

Other times the foundation could crack due to the contraction of concrete during its curing process. Typically within the first year that home was built, you might begin to lớn see these types of cracks appearing.

Regardless of what type of cracks you notice, it is very important to keep an eye on them khổng lồ make sure they are not getting bigger. When cracks start to lớn get bigger, so will the problems you’ll have sầu.


Is The Crack Dangerous or Normal?

It is not unusual for your foundation to begin to crachồng. Foundation cracks can come in many different shapes và sizes, and knowing which ones are more serious then others is very important. Most cracks are due khổng lồ the home settling naturally and not a cause for you khổng lồ be worried.

In newer homes, you might see what is called shrinkage cracks. Shrinkage cracks can occur within the first year that the home is built, & generally not a cause of concern. What happens is that when the concrete foundation gets poured, it contains thousands of liters of water, và over time that water will slowly evaporate, causing the concrete lớn dry & slowly crack. Most of the time you will see shrinkage cracks under basement windows and above door frames. It is not uncommon lớn also see shrinkage cracks in the middle of the wall as well.

A more serious type of foundation crachồng that can occur on newer homes, but is not uncommon to lớn see on some older homes, is caused by the ground moving. This type of problem will require a full excavation of the surrounding foundation walls. So knowing which type of crack you are looking at is important.

Vertical Cracks in Foundation

Vertical cracks in your foundation are typically the most common type of craông chồng that you will see. These types of cracks are normally the result of the trang chủ settling, wall movement, tipping walls, or shrinkage due to lớn the concrete drying. They can usually be found in the middle sections of a wall, và run vertically up và down, or diagonally.

If your vertical crack is wider than 1/8 of an inch, it might be best if you had a professional come out and take a look to make sure it’s not something that you should be more concerned about.

You might find that measuring the crachồng with a ruler or a tape measure could prove sầu a little difficult in trying to lớn determine the exact width. An easy reference lớn use is: A credit card is 1/32 inches wide, a nickel is 1/16 inches wide, and two dimes together are 1/8 inches wide.

Horizontal Cracks in Foundation

Horizontal cracks are generally an indication of a much more serious problem. Horizontal cracks are caused by what is called hydrostatic pressure coming from the outside of the wall. This could happen due to lớn heavy rains or flooding, và over time this pressure can cause the foundation wall lớn cave in, causing the horizontal cracks to lớn appear as the wall slowly begins to give sầu out.

If you notice horizontal cracks in the foundation, you should also be on the lookout for the following:

Horizontal cracks that veer-off into lớn other directions.The Floor above sầu the foundation could begin to slop.Vertical cracks that are wider at the top & narrows as it goes down the wall.Is the craông xã wide enough to lớn slip a whole dime in?From the interior, does the wall look khổng lồ be bulging in.

These are signs of a more serious problem going on that should have a professional contractor look at right away.

Stair-Step Cracks in Foundation

A stair-step craông xã is one of the more serious types of cracks that occur in concrete blochồng and brick foundations. These cracks flow diagonal, going from the bottom to the top in a step-lượt thích pattern. Stair-step cracks are the cause of foundation movement.

Foundation can mean many different things when dealing with what causes the stair-step crachồng. Different things come into play, such as the location, form size, & shape of the crachồng lớn determine the cause. You also need lớn look at things like the material from which the foundation is made from, the age of the building, construction methods, and other surrounding observations lớn fully understvà what caused the craông chồng in the first place.

Stair-step foundation cracks should be looked at by a professional contractor to lớn make sure there isn’t a bigger problem to lớn come.

How Much Does it Cost to Fix Foundation Cracks?

Cracks will normally start small, but without fixing them right away they can get bigger và become more expensive khổng lồ repair. To determine how much it would cost lớn fix the crack depends on how serious the problem is & what caused it. Some cracks you will be able to lớn repair yourself, while others will require the help of a professional.

There are complete kits available khổng lồ help make it easy for you khổng lồ repair the craông xã yourself that you can buy from your local hardware store or on Amazon for as low as $105 Cliông xã here to lớn find repair kits.

These kits contain all of the same material that a professional would use if they were to come out to lớn your trang chủ lớn repair the crack from the interior.

Keep in mind that if you have sầu a finished basement, you will need to cut out the drywall to expose the foundation underneath to lớn get khổng lồ the craông chồng. This could add an additional $75 lớn $150 for the material and paint if you were khổng lồ vị it yourself.

If You Hire a Professional

If you choose khổng lồ hire a professional, you should have at least three different foundation repair contractors come out & give you a detailed quote right away. Make sure the contractor is bonded, insured, and licensed in your state.

You can expect to lớn pay anywhere from $300 to lớn $14,000. Typically on average throughout the United States, the cost could range between $900 lớn $6,500.

Minor cracks are more affordable và could cost between $300 khổng lồ $800 to repair. Minor cracks that occur due to the foundation sinking, or from access pressure on the foundation walls, are much easier lớn repair and will not cause structural damage if repaired quickly. Even a small crack that is 1/8 inches wide can cause much more damage khổng lồ the structure if left unfixed.

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If required, a soil report by a geotechnical engineer can cost between $500 khổng lồ $2,000, depending on the problem, cấp độ of details needed in the analysis, and who you hire.

Poor drainage is another comtháng problem, và one that is not cheap khổng lồ fix. For this, all of the dirt surrounding the foundation will need excavating so that a proper waterproofing system can get installed. The cost of fixing this type of problem could range between $2,000 to lớn $7,500.

Typically, foundation cracks occur due lớn the home settling & sinking unevenly. Homeowners can expect to lớn pay anywhere between $8,000 lớn $14,000 to have sầu their home page leveled off. For this procedure, the earth next lớn the foundation needs excavating so that several hydraulic piers can be placed underneath the foundation khổng lồ help raise và level the house.

Some costs can even be much higher than $14,000 depending on how severe the problem is, & how large of a problem you have sầu. It’s not unheard of to see some homeowners spover upwards of $30,000.

Many homeowner insurance policies vày not cover the costs of foundation repairs.

How Do You Fix a Craông chồng in a Foundation Wall Yourself?

Fixing a foundation crachồng from the inside is not a complicated process, and by doing it yourself, you could over up saving a few hundred dollars, not having to gọi in a professional.

I used the Fast Set Concrete Foundation Crachồng Repair Kit from Amazon, which cost $135 at the time (cliông xã here for current price). Alternatively, there are other great repair kits available that all bởi the same thing, but I chose the package that I did because of the price tag và the good reviews from other buyers.


As you can see from the steps below, it is an incredibly easy process to lớn bởi yourself using one of these kits.

Fixing Foundation Crachồng From The Inside

Before attempting to lớn repair the craông xã, make sure that it is currently not leaking water. The inside of the craông chồng can be damp, but the exterior surface should be dry for the ports lớn stick.


Step #1: Lay a plastic bag or newspapers on the floor, under the crack. Next, use a wire bristled brush or masonry brush to clean away any paint, dirt, & other debris from the crachồng & surrounding area, then wipe the surface clean using a rag.


Step #2: Starting at the bottom of the craông chồng, measure up 4 inches, và then make a mark on the craông chồng. Now, from that mark you just made, measure up 6 to 12 inches and place another mark. Keep doing this until you reach the top of the craông xã. These marks represent where the entry points will be for the injection process. If the crack is tight, you should place the marks closer together.


Step #3: Insert the poxy paste inlớn the caulking gun. Next, unscrew the cap & remove the plugs from the nechồng. Now, on a piece of cardboard, squeeze out approximately 4 ounces of poxy paste, then phối the two parts until you have a unisize grey color that doesn’t have sầu streaks.


Step #4: Apply a small bit of the mixed poxy to lớn either side of the surface ports, and place the ports over the crack on the marks that you previously made. The poxy should stiông chồng the port lớn the wall and not fall off. Ensure that the poxy hasn’t covered the injection portholes. Once you’ve sầu placed a surface port on each of the marks, allow 15 to 20 minutes for the poxy to set.


Step #5: After 15 to đôi mươi minutes, set an additional batch of the poxy paste, and stir it up khổng lồ get that consistent grey color. Apply the mixed poxy over the craông chồng at least 1/8 to lớn 1/4 inch thiông chồng, and at least 4 inches wide on either side of the craông xã. Apply a little extra around and over the base, and part of the neông chồng on the surface ports as you go. Allow 45 to 60 minutes for the paste lớn cure.


Step #6: Once the paste has cured, fill the provided plastic bottle with water & start to lớn squeeze water into the top port. You should notice some water coming out of the port below. Continue squeezing water in each port down the crachồng.


Step #7: Unscrew the cap on the Hydra Stop 300 container & remove the plugs inside. Attach the long 24-inch nechồng lớn the Hydra Stop 300 container, securing it tightly with the attachment cap. Then, place the Hydra Stop 300 inkhổng lồ the caulking gun.


Step #8: Starting at the bottom of the crack, tightly insert the nozzle into lớn the surface port & slowly begin khổng lồ inject the Hydra Stop 300 solution. It is important lớn take your time while injecting each crack, as it could take up to 5 minutes khổng lồ fully inject the craông chồng. The tighter the craông xã, the longer it could take.

Once you see the solution ejecting from the port above, you can stop & place a plug into lớn the surface port khổng lồ prsự kiện the solution from leaking out. Repeat this step until you have injected all of the ports, và you’ve sầu placed plugs in each one as you went. Allow at least 24 hours for the solution khổng lồ cure.

Step #9: After 24 hours, you can remove the surface ports from the wall by banging down on them with a hammer, or you may also use a surface grinder or chisel for popping the ports off the wall.

What Causes Foundation Cracks?

Several different things contribute to lớn causing foundations to craông xã. Most of the problems are related khổng lồ either poor soil beneath the foundation or uneven moisture levels in the soil next to lớn the foundation.

For example, the most common reasons for foundation cracks are generally caused by hydrostatic pressure or from foundation settlement. Hydrostatic pressure is caused by excess water build up in the soil next to lớn the foundation, while foundation settlement cracks form when the soil underneath the foundation shrinks due lớn a laông xã of moisture.

Upheaval is another common cause for foundation cracks, which is the opposite effect of a settlement craông xã. Upheaval occurs whenever your foundation moves upwards due lớn the expansion of the coil underneath. This type of problem is one of the more serious kinds because it could cause your home page lớn become unsafe lớn enter.

Several reasons why foundations can crack:

SettlementDeteriorating (aged) concreteShrinkageTree rootsFaulty constructionPoor drainagePoorly mixed concreteUnstable soilHydrostatic PressureExcessive sầu moisture in the soilLaông chồng of maintenance

Cracks in the foundation will most often occur in weak points lượt thích corners, basement window frames, piped in areas, and walls. When you first begin lớn notice cracks in the foundation, it is important to keep track of them và make sure that they are not getting any bigger.

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One thing you can vì chưng is take a pencil and mark on the foundation where the kết thúc of the craông chồng is, và then over time, look khổng lồ see if the craông xã has expanded past the mark to lớn indicate that it is getting bigger. Don’t hesitate khổng lồ Điện thoại tư vấn a contractor if you feel the crack is getting worse.