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We've all been there - you're sitting in your basement during a rainstorm and notice water starting to pool on the floor. A basement leak can turn into a huge headache if not addressed quickly.
What is the source of basement leaks when it rains? Truthfully, they can be a number of things. However, the most common causes of a basement leak when it's raining is a cracked foundation, poorly insulated basement windows, unsealed utility pipes, ineffective exterior waterproofing, poor drainage, or sump pump failure.
Here are the most common causes of basement leaks during rainstorms and how to fix them.
The most obvious cause of a leaky basement is a crack in the foundation. Concrete naturally shrinks and expands over time, leading to cracks. These cracks allow water to seep in from the soil outside. Inspect the inside and outside of your foundation walls for cracks. Use a flashlight to peer into cracks - if you see daylight, it's letting in water.
Seal minor cracks with hydraulic cement - it expands as it cures to fill cracks. For larger cracks or signs of foundation settling, call a foundation repair company to stabilize and waterproof the foundation.
Basement windows can leak for a couple reasons. The window frame or seal may be damaged, allowing rain to drip in. Also, a window well outside may fill with rain and leak through a closed window. Inspect windows for cracks and broken seals. Recaulk around windows with exterior silicone caulk. Make sure window wells are clear of debris so rain can drain. Install a plastic window well cover to keep out rain.
Places, where pipes and wires enter the basement from outside provide an opportunity for leaks. Rain follows the pipe through the hole into your basement. Seal gaps around all pipe penetrations with expanding foam or caulk. For larger gaps, stuff with a backer rod before sealing.
Your basement walls should have waterproofing on the exterior to prevent moisture from seeping in. Cracks, peeling patches, or lack of waterproofing altogether can allow leaks. Signs of faulty waterproofing include efflorescence (white powder on walls), mold, or musty smells. Reapply waterproofing paint or membrane to the exterior walls.
Sometimes the issue is water pooling next to your home's foundation. Gutters and downspouts should direct roof rainwater away from the home. Grade soil to slope away from the house. Extend downspouts further from the home or install a French drain system around the perimeter. This improves drainage and keeps groundwater from penetrating the basement.
A sump pump collects water pooling next to or under your foundation and pumps it away from the home. If the sump pump fails due to a power or mechanical issue, water can back up and flood the basement. Test the sump regularly by pouring water into the pit. Install a battery backup sump pump in case of power outages. Replace old sump pumps every 5-10 years.
Finding and repairing the source of basement leaks can be tedious. But addressing water problems quickly prevents further damage like mold growth or foundation cracks. Regular maintenance also stops small leaks from becoming huge headaches down the road. With some diligent inspections and sealing repairs, you can keep your basement dry and avoid the hassle of major leakage issues.
We often recommend the proper drainage system for your home's foundation. This prevents wet basements and drains away excess water. If you need a drain tile system, reach out to our experts.
About South Bend Basement & Foundation Repair
For two decades, South Bend Basement & Foundation Repair has offered affordable, reputable services for residential and commercial customers. Using the latest technology and techniques, customers can have peace of mind when our contractors are on the scene. Are you interested in a FREE inspection and estimate? Great! To get scheduled, please call (574) 777-0207.
How do you fix a basement that leaks when it rains?
Inspect the foundation walls and windows for cracks and seal them with hydraulic cement or caulk. Make sure the exterior foundation is properly waterproofed and reapply sealant if needed. Install window well covers, extend downspouts, and slope the ground away from the house to improve drainage. Test the sump pump regularly and have it repaired or replaced if it fails to keep water from accumulating under the foundation.
Is it normal for a basement to leak when it rains?
While it's common for basements to get some leakage during heavy rains, it is not normal for them to have major water problems. Minor dampness or small drips can be expected, but standing water, large puddles, or water pouring in points to an issue that needs repair. Persistent leakage during storms usually indicates a problem with the foundation, drainage, waterproofing, or the seal around pipes and windows. If your basement leaks every time it rains, it likely means there is damage or a deficiency that requires fixing to prevent further water damage.
Is it normal for water to seep through basement wall?
While a small amount of moisture seeping through basement walls may be unavoidable, significant water intrusion is not normal. If you notice water consistently trickling in or see large damp patches after rain, that indicates a problem. Common causes of abnormal seepage are cracks in the foundation, deficient waterproofing on the exterior walls, poor drainage around the home, or issues with the seal around utilities and pipes. Persistent wet walls allow mold growth and can lead to structural issues, so it's important to identify and repair the source of any abnormal water coming through the basement wall or basement floor.
How do I know where water is coming into my basement?
Carefully inspect the interior basement walls and floor to find damp areas or trails of moisture that may point to the source. Check where the floor and walls meet for standing water or drips from above. Examine the exterior foundation for cracks, faulty waterproofing, or signs of poor drainage. Look closely near window and door frames, utility pipes, and the sump pump for any openings or leaks around seals. Monitoring the basement during heavy rains can help pinpoint where water is infiltrating from the inside and outside.
