The short answer
Find the Entry Points
Water usually enters a garage through the door seal, cracks in the floor, or gaps where the wall meets the foundation. Look for light coming in under the door or feel for drafts. Check the bottom of the door for worn or cracked rubber gaskets. Also inspect the garage floor for hairline cracks, especially where the floor meets the wall.
During a rainstorm, watch where water pools or drips. You might notice a puddle forming near one wall or a stream running under the door. If you see water coming from the ceiling, the issue could be a roof leak or a plumbing leak above. If you live in Redmond, keep your shutoff valve location written down in case a pipe bursts.
Improve the Drainage Outside
The ground around your garage should slope away from the foundation so rainwater runs off. If the soil has settled or is graded toward the building, water will naturally flow toward the door. You can add soil or gravel to create a slope that directs water away. Make sure the downspouts from your gutters discharge at least a few feet from the garage.
- Clear leaves and debris from gutters and downspouts.
- Add soil or gravel to create a slope away from the garage.
- Extend downspouts to carry water at least 3 feet away.
- Check for low spots in the driveway where water collects.
- Install a rain barrel or a French drain if needed.
Seal the Door and Floor Cracks
A garage door seal that is worn or missing lets water in easily. You can replace the rubber gasket along the bottom and sides of the door. Make sure the seal fits snugly when the door is closed. For floor cracks, use a concrete crack filler or a waterproof sealant. Clean the crack first and let it dry completely before applying the filler.
For larger gaps around pipes or utility lines entering the garage, use expanding foam or a silicone caulk. Check the bottom of the wall where it meets the floor, as this is a common spot for water to seep through. If you have a finished garage, you might need to remove a small section of drywall to see what is behind it. If the problem persists, local water damage pros can help with a more detailed inspection.
Add a Drain or Sump Pump
If water still pools on the garage floor even after improving drainage and sealing cracks, you may need a floor drain. A drain installed at the lowest point of the garage floor can carry water away. You might also consider a sump pump that activates when water reaches a certain level. These options require some digging and plumbing work.
Installing a drain or sump pump is a bigger project. You will need to cut into the concrete floor and connect the drain to a suitable outlet. Check with your local building department about permits and codes. If you are not comfortable with the work, a plumber or a concrete contractor can handle it. The cost depends on the size of the area and the complexity of the installation.
- A floor drain at the lowest point helps remove standing water.
- A sump pump can handle occasional flooding automatically.
- Consult a plumber for proper installation and local codes.
- Ensure the drain outlet directs water away from the foundation.
When to Call the Pros
If you have tried these steps and water still enters, the problem might be more serious, such as a high water table or a foundation issue. In that case, you may need a professional evaluation. Water damage pros can inspect the garage and identify the source of the water. They can also perform emergency water extraction if you have standing water inside.
If the water has already caused damage to drywall, flooring, or stored items, you may need restoration work. This could include removing water-damaged flooring, repairing drywall, or treating mold growth. For mold, a mold professional is the right choice. If you have insurance, check your policy to see what is covered. Policies vary, and your insurer decides what is covered.
Water damage does not wait
Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.
Call Now (425) 407-5186Frequently asked questions
Why does water pool in my garage after rain?
Water pooling usually means the ground slopes toward the garage, the door seal is worn, or the floor has cracks. Rainwater may also run off the driveway and enter under the door. Check these areas and improve drainage to keep water away.
Can I use a dehumidifier to stop garage flooding?
A dehumidifier removes moisture from the air, but it will not stop water from entering. It can help dry out the garage after a flood and reduce humidity. Address the source of the water first, then use a dehumidifier to keep the space dry.
What is the right way to seal a garage door bottom?
The right way is to replace the rubber gasket along the bottom of the door. Choose a seal that matches your door type and install it so it compresses slightly when the door closes. This creates a tight seal that blocks water and drafts.