How to Fix Leaking Basement Walls

Stop basement leaks

Replace window wells: Replacing old or rusted window wells will reduce water ingress and keep soil away from window openings. Cracks in the wall are one of the most important causes of basement leaks and often become visible during rain. In unfinished basements they are quite noticeable, but in unfinished basements you should check for cracks through the wall from the outside of the foundation. 

There are few things worse for a homeowner than finding water in their basement, especially if it's not entirely clear where it's coming from. Fortunately, water seeping through basement walls is not always a cause for concern.

Basement leaks have several possible causes, some of which have simple and relatively inexpensive solutions.

Wall-to-floor junctions, also known as bays, are one of the most common culprits for basement leaks due to the gap between the wall and the floor. As groundwater rises, such as during.

Use the instructions below to locate the leak and find the best solution for "weeping" walls.

Finding the Source of a Basement Leak

As soon as you notice any wet spots on the basement floor or wall, look around to see if there are any obvious sources.

Signs of a basement water problem include small water leaks, damp walls and a puddle on the floor. The most common way water enters a basement is at the junction of the foundation wall and floor.

Replace window wells: Replacing old or rusted window wells will reduce water ingress and keep soil away from window openings.

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Wall-to-floor junctions, also known as bays, are one of the most common culprits for basement leaks due to the gap between the wall and the floor. As groundwater rises, such as during heavy rain, more pressure is applied to the joint, allowing water to penetrate.

In addition to wall and floor joints, here are some other common sources of basement leaks:

1. Tops of Walls: Water can flow over the top of basement walls if the ground surrounding your home is flat or slopes toward your home.

2. Cracks in the wall: Cracks in the wall are one of the most important causes of basement leaks and often become visible during rain. In unfinished basements they are quite noticeable, but in unfinished basements you should check for cracks through the wall from the outside of the foundation. 

3. Floor cracks: Like wall cracks, basement floor cracks can be a sign of a serious problem. Cracks less than 1/8 inch wide are normal, but anything wider should be sealed.

4. Tie holes: more common in older homes. These holes can be seen in poured concrete foundations where ties were used to hold the wooden planks together. Fortunately, closing these holes is quick and easy.

5. Window Downspouts: Rain outside basement windows can let water in if there isn't enough drainage around your property or if the gutters aren't working properly.

6. Honeycombs: Poorly mixed concrete can sometimes create air pockets in basement walls, leaving "honeycomb" marks on the wall. These bubble spots are usually a minor problem and can be sealed.

7. Leaky Pipes: Drain pipes are another potential culprit for basement leaks. Check your ceilings and walls for stains or mold.

Fixing Small Basement Wall Leaks

Stopping a basement leak can be a simple task if you know the problem is not more serious. Here are some relatively easy DIY solutions to fix a leaking basement inside and out:

•  Replace window wells: Replacing old or rusted window wells will reduce water ingress and keep soil away from window openings.
•  Clean gutters and adjust downspouts: Clean gutters and extend downspouts to keep roof water away from the foundation. You don't want to rely on that alone to keep your basement dry. 
• Install a dehumidifier: A dehumidifier will not prevent basement leaks, but it will remove excess moisture from the air.
• Rehabilitating your soil: Rehabilitating the soil around your foundation will help direct groundwater and surface water down into the basement. Use this quick guide to determine the slope of your yard, then call in a landscaper or adjust the slope yourself with a slide style and garden branch. 
•  Seal Tie Holes: If you are sure the leak is coming from the tie holes in your wall, you will need to seal them with a compressed plug. WikiHow has a comprehensive article explaining how to install them yourself.