How to Stop Water from Coming Under Your Door – The Easy Way

How to Stop Water from Coming Under Your Door
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Door threshold water intrusion is one of the most frustrating water issues for homeowners. The water gets in and ruins the floor, door, and walls of your home. It can also damage the door frame, causing the door to stop closing properly and leak water when it rains.

In this blog, we will discuss the easiest way to stop water from coming into your home through doors – replacing your door threshold. We’ll also explain how to seal an exterior door threshold to prevent water damage. And lastly, we’ll tell you if you can waterproof a door bottom or seal the doorway.

Why is water coming in under door threshold?

Water can enter your home through gaps around the door threshold due to improper installation or maintenance. This is due to gaps left between the door and the frame of the door, causing a small opening for water to enter the house.

When weather conditions are wet and humid, water can seep in through the gaps around the door threshold because of draft. A draft is air movement caused by a door being opened or closed. As water gets into this gap, it can slowly seep into your home.

Another common reason for water coming under your door threshold is leakages from other parts of the house. This may be due to poorly installed door sweeps or door seals on other parts of the house. Water coming under your door threshold can also be caused due to water leakage from the faucet or showerhead of your bathroom.

How to Stop Water from Coming in Under the Door

Water infiltration is the process of water entering your home through the door or windows. If you have water penetration problems, it’s important to identify the source of the water intrusion.

You can start by sealing all the leaks around your door frame and baseboards, repairing or replacing any defective caulking or flashing around your door and windows, and making sure your door is properly installed and caulked to prevent air infiltration.

Also, consider installing a weather stripping system along the exterior of your door and window openings to provide additional water protection. By following these simple steps, you can stop water from coming in under your door easily.

Replace your Door Threshold

The replacement of the door threshold plate is one of the most frequent solutions offered by pros. Replacing a door threshold that wasn’t properly bedded the first time it was put in with a new one, which has been precisely measured out, might be a more suitable option.

The procedures outlined below will help you replace your door threshold:

1. Gather the Tools Needed

One thing that many do-it-yourselfers overlook but is vital before beginning out on door threshold installation jobs is to gather all of the equipment and materials needed. Since you don’t have to go back and forth hunting for stuff while trying to work, this saves you time. The following materials are required for this project:

  1. Drill and drill bits are included in the kit.
  2. A caulk gun and caulk are available.
  3. Screw fasteners.
  4. Paper towels.
  5. A wet mop/ vacuum cleaner.
  6. Sealant.

2. Prep the Area

Before replacing the current threshold, there are a few steps to take. On the inner side of the exterior door, you’re likely to have water and debris from recent storms. The sealant sticks better to the threshold plate by removing built-up dirt around the door area. As a result, you’ll want to clean up any dirt on the door threshold and door sill before mopping up any standing water.

3. Remove the Old Threshold

Unscrew open the current threshold to remove it. Also, vacuum the region beneath the threshold plate after removing it.

4. Create Pilot Holes

Drill pilot holes through the new threshold plate using a drill and a appropriate drill bit after prepping the area and removing the previous door threshold. The threshold can securely connect to the flooring or door sill beneath it thanks to pilot holes. Drilling the holes should be done at least six inches apart, according to experts.

Drill some more holes through the door sill or floor area on which the door threshold will sit after drilling the pilot holes through the threshold. Make sure that the second set of pilot holes on the threshold plate is placed and spaced correctly relative to the first set. This will ensure that the item fits perfectly.

The kind of material you’re drilling through determines what sort of drill bit you should utilize. On wooden thresholds and wooden door sills/floors, for example, a ordinary drill bit will suffice. A titanium drill bit, on the other hand, is the most effective for metallic thresholds. A masonry drill bit is required for concrete/stone floors and door sills.

5. Apply Sealant/Caulking

Apply caulking to the region around your door threshold to prevent water from seeping through it. A clear caulk sealant may be purchased for roughly $10 online. It will also preserve your doorway’s aesthetics while curing, since it will effectively make the bottom part of the threshold watertight.

6. Install the threshold Plate

Next, replace the floor or door sill below it with a new door threshold. Drive screw fasteners through the pilot holes you drilled earlier using a screw gun to do so. You should make sure that you’re driving in as vertical a position as feasible with the screws. During downpours, angled fasteners are more likely to create gaps that allow water to seep out of the exterior door.

Excess caulking that you’d previously applied to the region might seep through the borders since the screws securely fasten the threshold to the surface below it. Use an old shirt or a paper towel to wipe it off.

You should also keep in mind that before installing the threshold, you may shim in the area between the floor/door sill if the new criteria is too low to adequately close up the space. This will enable the threshold to lift higher and eliminate the space below the door effectively.

7. Apply Final Coats of Sealant

Finish off the job by applying a liquid rubber sealer once the threshold has been properly replaced. Spray the sealer along the threshold’s inside edge, as well as where you’ve applied caulk, on both sides. Consider how long it will take for you to cure the sealant. Because it allows you to apply additional coats quicker after the first coat cures, faster-drying sealers are preferred. This allows you to finish your doorway threshold project sooner, which is ideal.

Install Weatherstripping

Installing weatherstripping beneath the bottom of the door is another effective way to prevent water from seeping indoors. Installing a door sweep is one of the simplest and quickest ways to gasket under your door.

The top of the threshold plate and the bottom of the door frame in typical American doors are usually separated by 1/8 inch gab. This gap will be effectively closed by mounting a door sweep beneath the door.

We recommend the following procedures to effectively weatherproof the bottom of an exterior door using sweeps:

  1. Measure the width of the space between the bottom of the door frame and the threshold’s bevel before purchasing a door sweep. This ensures that you’ll get the right sweep for your needs.
  2. It’s time to buy a door sweep after finding the correct gap size. A U-shaped sweep or a metal sweep are both options. A metal strips may be taped to the bottom of the door frame by stapling, screwing, or nails it down in order to seal the gap beneath doors.
  3. Install your door sweep next. All you have to do is slide it into position to mount a U-shaped door sweep. Installing a metal strip door sweep, on the other hand, can be challenging. Initially, you must remove the door from its hinges in order to get to the bottom of the frame. Next, through both the metal sweep and the bottom of the door, you’ll need to drill matching pilot holes. Finally, to fasten the metal strip to the door, drive screws through the pilot holes.Lastly, before opening and closing your door, check for any debris on your door sweep to make sure it doesn’t get caught. You may have to call in a professional if you went for a do-it-yourself installation and are having this problem.

An automatic door bottom is a great option for replacing a door sweep. Weatherstripping of this sort is customizable. As a result, your exterior door lowers to seal the gap when you close it. The door is then released from the threshold bevel as you open it, preventing it from binding.

Can you waterproof a door bottom?

Waterproofing a door bottom is not as difficult as it might seem. There are a few simple steps you can take to waterproof your door bottom.

Check the door bottom for water damage and fix any obvious signs of water intrusion. Reinforced weatherstripping that includes waterproof foam construction should be used to seal the bottom of your outdoor or patio door.

Since they don’t provide enough protection against the elements, felt weatherstripping or open-cell foam weatherstripping is not recommended.

Does sealing an exterior threshold prevent storm water?

You can seal an exterior threshold to stop water from coming under the door, but it doesn’t stop water from entering the home. It’s the job of the weather seal on the exterior of your home to seal out water. If the weather seal is broken or damaged, water can come into your home.

Another option is to install a perimeter drainage system. This system collects and dumps rainwater outside of your home. You can also install a waterproofing membrane on the interior of exterior doors and windows. This membrane helps stop water from seeping into the house when it’s not open.

Finally, you can use landscape fabric to create an impermeable barrier between the ground and your foundation. This will help stop water from getting underneath your door frame and into your home.

By making sure that water cannot enter your home, you can prevent costly damage to your doors and windows.


It’s time to seal the door threshold to stop water from gaining entry. Most homeowners seal the door threshold with a caulk gun and a caulking gun. You can also use weatherstripping, gasket sealer, or threshold sealant. It’s essential to seal the door threshold regularly so that water doesn’t leak in and damage your home.

It’s also essential to maintain the seals to stop water intrusion and mold growth in your home. Remember, water is the number one cause of basement flooding. So, if you want to keep your house dry and save money on water bills, it’s best that you seal your door threshold today!

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