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How Do I Stop Water From Coming Under the Door?

Last updated October 31, 2026

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The short answer

Check the Door Sweep and Threshold

A door sweep is the rubber strip along the bottom of the door. Over time, it can crack, bend, or lose its seal. Look for gaps by closing the door and checking for daylight underneath. If the sweep is damaged, replace it with a new one that matches the door width.

The threshold is the metal or wood piece at the floor. It should sit flush with the sweep to block water. If the threshold is worn or uneven, you can adjust it with shims or replace it. For a quick fix, apply a weatherproof sealant along the bottom edge, but this is temporary.

Temporary Barriers for Heavy Rain

During a downpour, a rolled-up towel or a sandbag placed along the bottom of the door can soak up or divert water. This works well for short-term protection while you address the cause. Make sure the barrier is snug against the floor and the door.

Another option is to install a door dam, a rubber strip that sits on the floor just inside the door. It creates a raised lip that blocks water from spreading. These are easy to remove and can be reused. Keep in mind that this does not stop water from entering, it just contains it.

  • Roll a towel and press it firmly against the door bottom
  • Use a sandbag, available at hardware stores, for heavier flow
  • Place a door dam on the interior floor to create a lip
  • Check after each storm to see if the barrier held
  • Do not rely on these as a permanent fix

Fix the Drainage Around Your Door

Water often pools near a door because the ground slopes toward the house. Check the soil grade outside. It should slope away from the foundation for at least six feet. If it does not, add soil or mulch to create a gentle slope. This helps rainwater flow away instead of toward the door.

Also inspect your gutters and downspouts. A clogged gutter can overflow and dump water right next to the door. Extend downspouts so they discharge at least three feet from the foundation. If you live in Quincy, keep an eye on the downspout after a nor'easter, since heavy snowmelt can add to the flow.

Weatherproof the Door Itself

The door frame and the door bottom can let water in even when the sweep looks fine. Check the frame for cracks or gaps where water can seep through. Apply exterior-grade caulk along the frame and the threshold to seal small openings. This helps block wind-driven rain.

If the door is old or warped, it may not close tightly. Adjust the hinges to pull the door tighter against the frame. You can also install a door shoe, which is a metal and rubber strip that mounts on the exterior bottom of the door. It provides a more durable seal than a simple sweep.

When to Call the Pros

If water keeps coming under the door despite these fixes, the cause may be deeper, such as a high water table or poor foundation drainage. Local water damage pros can inspect the area and suggest a solution. They can also check for hidden damage in the subfloor or door frame.

Water that sits against the door can lead to rot and mold over time. If you notice softened wood or a musty smell, address it quickly. The pros can remove water-damaged flooring or dry out the crawlspace if water has seeped underneath. Acting early prevents bigger issues.

Policies vary, and your insurer decides what is covered. If you file a claim, document the damage with photos and keep receipts for any temporary fixes.

  • Water damage inspection to find the source
  • Door frame repair if the frame is rotted
  • Water-damaged flooring removal if the floor is soaked
  • Crawlspace water extraction if water pools under the house

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Frequently asked questions

What is a sensible temporary fix for a door that leaks during a storm?

A rolled towel or a sandbag placed along the bottom of the door works well for a few hours. Make sure it is snug against the floor. For a better seal, use a door dam that you can install and remove as needed. These are not permanent, but they buy you time.

How do I know if my door sweep needs replacing?

Close the door and look for daylight underneath. If you see light, the sweep is not sealing. You can also slide a piece of paper under the door; if it moves easily, there is a gap. Replace the sweep if it is cracked, bent, or worn. It is a simple DIY task.

Can I fix the slope of the ground myself?

Yes, you can add soil or mulch to create a slope away from the foundation. Aim for at least six inches of drop over the first ten feet. Use a rake or shovel to shape the soil. If the ground is heavily saturated, you may need to install a French drain, which is a bigger project.

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