Why Is There Water Seeping Into My Attached Garage?

Your garage floor or walls may get wet because of issues outside the structure. Heavy rain can pool against a garage door if the ground slopes toward it. Clogged gutters or downspouts can dump water right beside the foundation. Cracks in the garage's concrete slab or foundation walls also provide a direct path for groundwater to enter, especially after a storm.

Start by checking for active dripping or pooling during dry weather, which points to a plumbing leak. Inspect the walls and ceiling for damp spots or stains. Look at the perimeter of the garage door and the joint where walls meet the floor for signs of seepage. Tracing the water's path back from where it's pooling can often lead you to the entry point.

• Check the water heater and any visible pipes for moisture.
• Inspect gutters and downspouts for clogs or misdirection.
• Look for cracks in the garage's concrete floor and walls.
• Examine the seal and threshold of the main garage door.
• See if the ground outside slopes toward the garage.
• Note if the problem occurs only during or after rain.

If you cannot find the source, or if the water volume is significant, you need help. Persistent dampness or a musty smell suggests hidden moisture that can lead to mold. Water that has soaked drywall, insulation, or subflooring requires specific drying equipment. Local water damage pros have tools like moisture meters and thermal cameras to find hidden water you might miss.

• You see water actively leaking from a wall or ceiling.
• A large area of flooring or drywall is saturated.
• The problem returns every time it rains.
• You notice a new musty or earthy odor in the space.
• Electrical outlets or fixtures in the garage got wet.
• You suspect the leak originates from a shared wall with the house.