How to Stop Water Leaks Under a Door Frame

Updated April 17, 2017

Water can leak through gaps under exterior doors, damaging floors and carpets and causing dampness and mould growth. Install weatherstripping under the door to seal it from water leaks. The best form of weatherstripping for doors is made from reinforced, waterproof foam that will compress and stretch each time the door is opened or closed. Avoid felt or open-cell foam, as they may not provide adequate protection against weather, according to the United States National Renewable Energy Laboratory.

Calculate how much reinforced weatherstripping you will need to protect the bottom of the door. Open the door and measure the length of the threshold with a tape measure. Allow 5 per cent to 10 per cent extra as an error and waste margin. You will need to apply weatherstripping to both the bottom of the door and the frame threshold to form a watertight seal.

Clean the bottom of the door and the threshold by wiping them with a clean cloth dampened with water and a squeeze of dish detergent. Wait for the surfaces to dry.

Cut the correct lengths of reinforced weatherstripping from the roll with a sharp utility knife. Use a tape measure to get the right length. Cut two lengths -- one for the bottom of the door and one for the threshold at the bottom of the doorframe.

Unpeel the backing tape from the weatherstripping. Push the weatherstripping along the centre of the doorframe threshold and press it firmly into place. Apply the weatherstripping to the underside of the door in the same way. Cut away any excess weatherstripping with the utility knife.


Fit a door sweep to the bottom of exterior doors to help prevent drafts and water leaks. Buy reinforced weatherstripping from a home improvement or hardware store.

Things You'll Need

  • Tape measure
  • Clean cloths
  • Dish detergent
  • Reinforced weatherstripping
  • Utility knife
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About the Author

Adrian Grahams began writing professionally in 1989 after training as a newspaper reporter. His work has been published online and in various newspapers, including "The Cornish Times" and "The Sunday Independent." Grahams specializes in technology and communications. He holds a Bachelor of Science, postgraduate diplomas in journalism and website design and is studying for an MBA.