How to Fix Water Leaking Under Garage Door

Are you tired of dealing with water leaking under your garage door every time it rains? Not only can this be frustrating, but it can also lead to serious issues such as mold growth, damage to your belongings, and even structural damage to your garage. Fortunately, there are several effective solutions to prevent water from seeping under your garage door. In this comprehensive guide, we will explore 5 effective solutions for how to fix water leaking under garage door.

How to Fix Water Leaking Under Garage Door

Key Takeaways:

  • Identify causes of water leaks under garage door, such as faulty seals, inadequate slope, and lack of gutters.
  • Implement solutions like replacing seals, adjusting slope, installing gutters, or creating a trench drain.
  • Regularly inspect and maintain seals and drainage to prevent water leaks.

Understanding the 5 Causes of Garage Leaks

Before we delve into the solutions, let’s first understand why water leaks occur in garages. Garages are often not designed to be completely waterproof, which makes them susceptible to water intrusion. Factors such as faulty seals, inadequate slope, and poor landscaping can contribute to water leaking under the garage door. Identifying the root cause of the problem is crucial in determining the most effective solution for your particular situation.

Cause 1: Faulty Door and Floor Seals

The garage door seal plays a vital role in keeping water out. Over time, these seals can deteriorate, crack, or become worn out, allowing water to penetrate through the gaps. Similarly, the seal between the garage floor and the door can also degrade, creating an entry point for water. Checking the condition of your door and floor seals is the first step in addressing the issue.

Cause 2: Inadequate Slope and Landscaping

The slope of your driveway and the landscaping around your garage can significantly impact water drainage. If your driveway slopes towards the garage, rainwater can accumulate and find its way under the door. Additionally, improper landscaping that directs water toward the garage instead of away from it can exacerbate the problem. Evaluating the slope and landscaping around your garage is essential in preventing water leaks.

Cause 3: Absence of Gutters

Gutters are designed to redirect rainwater away from your home’s foundation. However, some garages are built without gutters, leaving them vulnerable to water intrusion. Rainwater can run off the roof and pool near the garage without gutters, eventually seeping under the door. Installing gutters around the garage can effectively mitigate this issue.

Cause 4: Downward-Sloping Driveway

If your driveway slopes downward toward the garage instead of away from it, water will naturally flow toward the garage door. This can lead to significant water accumulation and subsequent leakage. Creating a barrier to redirect water from the garage is crucial in preventing this type of leak.

Cause 5: Other Potential Sources of Leaks

While the causes mentioned above are common, it’s essential to consider other potential sources of leaks, such as roof issues or window leaks. Sometimes, water may enter the garage through these areas and not directly through the door. Addressing these sources of leaks is equally important in keeping your garage dry.

Consider Other Potential Sources of Leaks

5 Effective Solutions for How to Fix Water Leaking Under Garage Door

Now that we have a clear understanding of the causes, let’s explore effective solutions to prevent water from leaking under your garage door. Depending on the specific issues you’re facing, one or a combination of these solutions can help mitigate the problem.

Solution 1: Replace Faulty Door and Floor Seals

If your door and floor seals are worn out or damaged, replacing them with new ones is a simple yet effective solution. Measure the length of your garage door and purchase a new seal that fits appropriately. Lift your garage door to a suitable height for installation, remove the old seal, and install the new one following the manufacturer’s instructions. Ensure that the new seal creates a tight seal against the floor to prevent water from seeping through.

Solution 2: Evaluate and Adjust the Slope and Landscaping

If you notice that your driveway slopes towards the garage, consider adjusting the slope to redirect water away from the door. This may involve regrading the driveway or modifying the landscaping to promote proper water drainage. Consulting with a professional landscaper or contractor can help you determine the best course of action based on your specific situation.

Solution 3: Install Gutters around the Garage

Installing gutters around your garage can effectively redirect rainwater away from the door and prevent water from pooling near the foundation. Ensure that the gutters are correctly installed and properly maintained to ensure optimal performance. Regularly clean out any debris that may accumulate in the gutters to prevent clogs and ensure proper water flow.

Solution 4:  Create a Trench Drain

In cases where your driveway slopes downward towards the garage, creating a trench drain can be an effective solution. A trench drain is a channel installed in the concrete in front of the garage door to divert water away from the garage. To install a trench drain, you will need to cut a narrow trench, insert a steel or PVC channel, pour concrete around it, and fit an iron grate on top. Regularly cleaning the grate to prevent debris buildup is crucial for maintaining the effectiveness of the drain.

Trench Drain is a Channel Installed

Solution 5: Consider Garage Floor Redesign

If all other solutions fail to mitigate the water leakage, you may need to consider redesigning your garage floor. This option is more extensive and costly but can provide a long-term solution. Raising the garage floor to a higher level can prevent water from entering the garage. However, this solution requires professional assistance and careful consideration of the overall structure and functionality of your garage.

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6 Additional Tips to Keep Your Garage Dry

In addition to the solutions mentioned above, here are some additional tips to help keep your garage dry and protected from water leaks:

  1. Regularly inspect and maintain your garage door seals to ensure they are in good condition.
  2. Keep the areas around your garage clean and free from debris that can obstruct water flow.
  3. Consider applying a waterproof sealant or paint to the garage floor to create an additional barrier against water intrusion.
  4. Install a sump pump in your garage if you frequently experience water accumulation during heavy rains.
  5. Ensure proper ventilation in your garage to minimize moisture buildup and reduce the risk of mold growth.
  6. If you notice any signs of water leakage, such as dampness or musty odors, address the issue promptly to prevent further damage.

By implementing these strategies and taking proactive measures, you can significantly reduce the chances of water leaking under your garage door and protect your belongings from water damage.

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Ensure Proper Ventilation

FAQs About How to Fix Water Leaking Under Garage Door

Why is My Garage Leaking Water When It Rains?

There can be several reasons why your garage is leaking water when it rains. Some common causes include failing door seals, slab seepage, gutter downspouts, a leaking roof, poor landscape sloping, cracks in the concrete slab, high humidity, and plumbing leaks. To address the issue, you can replace door seals, apply a waterproof coating to the garage floor, direct downspouts away from the foundation, hire a roof repair professional, address cracks in the concrete slab, add a dehumidifier, and ensure proper water flow away from the house by keeping gutters clean and directing water away from the garage.

Is It Normal for Water to Get Under a Garage Door?

It is not normal for water to get under a garage door. If water is leaking under your garage door, it indicates a problem with the door seals or other potential issues. Failing door seals are one of the common causes of water getting under a garage door. Other possible causes of water leakage in the garage include slab seepage, negative yard grading, home equipment leaks, foundation leaks, roof leaks, and plumbing leaks. It is important to address these issues to prevent further water damage.

What Should I Put on the Bottom of My Garage Door?

To prevent water from getting under your garage door, you can consider installing a bottom seal or threshold seal. These seals are designed to provide a barrier against rain, snow, dust, insects, and rodents. Threshold seals attach to the floor under the door and create a watertight seal, while bottom seals attach to the bottom edge of the door and provide additional protection. You can choose from different types of seals depending on factors like the shape of your garage door, the climate you live in, and whether or not you have a retainer on your door.


In conclusion, preventing water leaks under your garage door requires a comprehensive approach that addresses the underlying causes of the problem. Whether it’s replacing faulty seals, adjusting the slope, installing gutters, creating a trench drain, or considering garage floor redesign, there are various solutions available. By implementing these solutions and following the additional tips provided, you can ensure that your garage remains dry and protected, even during heavy rains. Remember, proactive maintenance and regular inspections are key to preventing water leaks and preserving the integrity of your garage.

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