7 Simple Ways to Stop Drafts Coming Under Doors

Drafts under doors can make your home uncomfortable and lead to higher energy bills. Understanding how to effectively seal these gaps is essential for maintaining a warm and energy-efficient environment.

7 Simple Ways to Stop Drafts Under Doors

To stop drafts in door openings, use weatherstripping, door sweeps, or draft stoppers. These methods seal gaps under doors to block cold air, dust, and noise from entering your home.

Drafts under doors happen because of gaps between the bottom of the door and the floor or threshold. These gaps let outside air in and warm air out, increasing energy loss by up to 30% according to the U.S. Department of Energy.

Here are seven practical ways to stop drafts coming through door bottoms, with pros, cons, and installation tips for each.

1. Install a Brush Door Sweep

A brush door sweep has dense nylon bristles attached to a strip that screws to the bottom of the door. It brushes against the floor or threshold to block air flow while allowing the door to open and close smoothly.

• Good for uneven floors or thresholds
• Durable and long-lasting
• Requires drilling for installation

Measure the door width and gap height before buying. Cut the sweep to fit and screw it onto the door bottom. Make sure the bristles lightly touch the floor without dragging, so the door isn’t hard to open.

2. Use Adhesive or Rubber Door Sweeps

Adhesive or rubber sweeps stick or screw onto the door bottom and seal larger or uneven gaps effectively. Rubber seals compress to fill gaps and block drafts well.

• Good for exterior doors with large gaps
• Easy to install with adhesive backing
• May wear faster than brush sweeps

Clean the door bottom thoroughly before applying adhesive sweeps. Press firmly and allow time to set. Check regularly for peeling or damage and replace when worn.

3. Apply Foam Weatherstripping Tape

Foam weatherstripping tape sticks to the door frame or bottom to seal small gaps. It is flexible and inexpensive but compresses over time.

• Ideal for small, uniform gaps
• Simple peel-and-stick application
• Needs periodic replacement

Measure the gap width and clean the surface before applying the tape. Press firmly to ensure good adhesion. Avoid using foam tape on rough or dirty surfaces.

4. Use Fabric Draft Stoppers (Draft Snakes)

Fabric draft stoppers are weighted tubes or ‘snakes’ placed against the door bottom to block drafts. They require no installation and are renter-friendly.

• No tools or adhesive needed
• Can be removed easily to open door
• May need repositioning frequently

Choose a draft stopper slightly longer than the door width. Move it aside each time you open the door. Some models have double-sided designs that block drafts on both sides.

5. Install Double-Sided Door Draft Stoppers

Double-sided draft stoppers attach to the door and seal gaps on both sides as the door moves. They are effective for interior and exterior doors.

• Blocks drafts on both sides
• Moves with the door
• Requires installation and precise measurement

Measure your door’s width and thickness before purchasing. Follow manufacturer instructions carefully for mounting. Check that the door opens and closes freely after installation.

6. Adjust or Add a Door Threshold

A door threshold raises the floor level under the door, reducing gap size. Adjustable thresholds allow fine-tuning for a tight seal.

• Improves seal with door sweeps
• Good for uneven floors
• Requires measuring and screwing into floor

Measure the existing gap and select an adjustable threshold if needed. Install according to the manufacturer’s guide, ensuring the door sweeps or seals brush lightly against it.

7. Use a Sock Snake or DIY Draft Stopper

Fill an old sock with sand, rice, or beads to create a weighted draft stopper. This DIY option is inexpensive and easy to customize.

• Cheap and simple
• No installation required
• Needs manual repositioning

Choose a sock longer than the door width for full coverage. Place it snugly against the door bottom each time to block drafts.

Before buying or making any draft stopper, measure the door width and the gap height accurately. This ensures the product fits well and doesn’t interfere with door operation.

If you have pets, consider how a draft stopper might affect their access or get damaged. Some materials resist pet wear better than others.

For fire-rated doors, avoid permanent seals that alter door clearance or hardware. Use removable draft stoppers that comply with safety standards.

Stopping drafts under doors improves comfort, reduces energy bills, and cuts noise and dust. Choose the method that fits your door gap size, floor type, and installation ability.

For more detailed advice on choosing and installing draft stoppers, see How to Stop Drafts Under Doors: 5 Simple Fixes.

What You Need

Here are the tools and materials to help you seal door drafts effectively.

Large foam seal

MAXTID Large Door Draft Stopper 36″

Its 2-inch foam diameter covers wider gaps and blocks cold air, noise, light, and odors effectively. It stays in place without damaging doors and adjusts to fit different door widths.

Check price on Amazon

Double-sided seal

MAXTID Under Door Draft Stopper 38″

This double-sided draft stopper reduces drafts, noise, light, dust, and smells. It fits standard door widths and slides easily under doors, moving with them for convenience.

Check price on Amazon

Understanding Draft Causes

Drafts under doors happen because of gaps between the bottom of the door and the floor. These gaps let cold or warm air flow freely, which wastes energy and lowers comfort. Homes experience drafts for several reasons, including structural shifts and air pressure differences.

One common cause is the settling of a home’s foundation. Over time, floors can shift or sag, creating uneven gaps beneath doors. If the door frame or threshold moves out of alignment, the door no longer seals tightly, allowing air to pass through.

Another major factor is the stack effect. Warm air inside the home rises and escapes through upper openings like attics, while cooler air is drawn in through lower openings such as door gaps. This airflow cycle pulls drafts under doors, impacting indoor air quality and increasing heating or cooling costs.

1. Check for uneven floors or door frames
   Look for visible gaps under doors and check if the door swings smoothly without scraping.
2. Notice temperature differences near doors
   Feel for cold or hot air blowing from under the door during heating or cooling seasons.
3. Observe your home’s air movement
   In winter, warm air rises and escapes from upper vents or leaks, pulling cold air in through door gaps at lower levels.

Choosing the Right Draft Stopper

Selecting the best draft stopper depends on your door’s gap size, floor type, and how often you open the door. For large, uneven gaps, under-door seals made of rubber, silicone, or vinyl work best because they compress to fill irregular spaces.

Fabric draft stoppers, like sock snakes, are renter-friendly and easy to move but require repositioning when opening the door. Foam draft stoppers slide under the door and stay put, but may drag on thick carpets or snag on rough floors.

Metal or rigid door sweeps install permanently and seal well on smooth floors but can make the door harder to open if not fitted correctly. Choose a flexible sweep for doors that need frequent opening without resistance.

To draft-proof a door without making it hard to open, choose a double-sided draft stopper that moves with the door. These block drafts on both sides and avoid extra friction.

Best for large uneven gaps

MAXTID Large Door Draft Stopper for Bottom of Doors 36” Under Door Sw…

The MAXTID Large Door Draft Stopper covers door gaps from 0.5″ to 1.7″ with its 2-inch diameter foam, moving easily with the door and not requiring repositioning.

Check price on Amazon

Installation Tips for Effective Draft Proofing

1. Install Door Sweeps
   Measure the door width and the gap under the door before buying a sweep. Most brush door sweeps attach with screws or adhesive to the door’s bottom edge. Position the sweep so its bristles or seal lightly touch the floor without making the door hard to open. For uneven floors, flexible vinyl or rubber sweeps work better than rigid ones.
2. Apply Weatherstripping
   Clean the door frame surface thoroughly before applying adhesive-backed foam or rubber weatherstripping. Cut the weatherstripping to fit each side of the door frame. Press firmly along the entire length to ensure a tight seal. Avoid overlapping corners to prevent gaps. Check that the door closes smoothly without compressing the weatherstripping too much.
3. Use Fabric or Foam Draft Stoppers
   For fabric draft stoppers like sock snakes, simply place them snugly against the door bottom inside. Foam draft stoppers slide under the door and should fit the gap without forcing the door open. Trim excess length if needed. These are renter-friendly and require no tools.

Easy to install draft stopper

MAXTID Under Door Draft Stopper for Bottom of Doors 38″ Black

This double-sided draft stopper slides under the door and moves with it, making installation tool-free and quick.

Check price on Amazon

Maintenance and Replacement of Draft Stoppers

Weatherstripping and door sweeps typically last 3 to 5 years, depending on traffic and exposure. Check them annually for cracks, tears, or loss of flexibility. Replace them if the seal no longer blocks drafts or the door becomes hard to close. Fabric draft stoppers last several years but need regular washing to avoid dirt buildup.

Inspect draft stoppers for signs of wear such as compressed foam, frayed fabric, or broken bristles. Replace or repair promptly to maintain effectiveness. Most door sweeps and weatherstripping are inexpensive to replace and improve energy savings.

Draft stoppers generally do not damage hardwood floors or carpets if they fit properly and slide smoothly. Avoid bulky or heavy stoppers that drag or catch on flooring. For hardwood, choose lightweight foam or brush sweeps; for carpets, fabric or softer materials work best.

Frequently Asked Questions