5 Ways to Weather-Seal a Garage Door

Keep out the Weather With New Garage Door Seals

Blue house with white garage door

The Spruce / Meg MacDonald

If you've noticed water, dirt, or rodent droppings in your garage, there's a good chance the problem can be traced back to your garage door. Garage doors are very large, and while all come with a bottom seal to keep out water, wind, dirt, and unwanted intruders, the seals themselves can break down over time. In more extreme cases, the concrete floor or driveway apron under the door can shift, crack, or settle, creating large gaps under the door that standard seals can't cover.

Weather-sealing a garage door usually involves a simple process of adding or replacing the bottom door seal and the weatherstripping on the stop molding along the sides and top of the door. It may also include adding thin weatherstripping between the door panels​ if you want to make the door as airtight as possible.

Importance of Weather-Sealing Your Garage

It's also important to weather-seal your garage to protect your home from damaging elements like fierce rain, snow, hail, and wind. If water enters your garage, it could freeze to create ice and water damage that will ruin your floor and potentially seep into your living spaces.

If your garage door is working well, then weather-sealing can be mostly a DIY job. Sometimes, the garage door needs a gasket replacement, adjustment, or other type of repair. Because it's vital that your garage door work and seal properly, you may want a professional garage door installation company to handle the job.

Here are five ways to weather-seal your garage door.

  • 01 of 05

    Garage Door Bottom Seal

    White garage door with a bottom seal with a black strip of rubber closeup

    The Spruce / Meg MacDonald

    The garage door bottom seal (or door sweep) is a long strip of rubber or vinyl that attaches to the bottom edge of the garage door. The flexible material compresses when the door closes, sealing the gap along the floor to keep out water, dirt, cold breezes, and critters. You'll know it's time to replace the bottom seal when you can see daylight below the bottom of the door when it is closed. You might also feel a draft or see water if the outside of the door gets wet.

    Wood garage doors typically use a simple strip-style seal with angled edges that seal against the front of the door and the floor. These typically are installed with galvanized or aluminum roofing nails.

    Metal garage doors typically have an aluminum channel on the bottom of the door that holds a U-shaped rubber gasket, sometimes called a T-style or astragal seal. The gasket simply slides into two small tracks on the channel for installation. You can also install a metal gasket channel onto a wood garage door so you can use this type of gasket.

    In addition to their easy installation, the best thing about U-shaped gaskets is that they come in different sizes to seal gaps of various heights. This can be an easy solution for large gaps created by sunken or cracked garage floors.

  • 02 of 05

    Garage Door Threshold Seal

    White garage door with threshold seal attached to garage floor

    The Spruce / Meg MacDonald

    A threshold seal serves a similar function to the bottom seal on a garage door, but it is attached to the garage floor rather than the door. Thresholds can be used alone or in conjunction with a door seal. Thresholds often are used to keep out surface water when a driveway slopes down toward a garage. They can also help fill a large gap below a door.

    A good-quality vinyl threshold seal can be more durable than a door seal. It is installed with an adhesive that is usually included with the threshold.

    Keep in mind that thresholds block water going out of a garage, just as they keep it from flowing in. This can be inconvenient if you like to hose out your garage. A threshold also makes it difficult to sweep dirt and debris out of the garage.

  • 03 of 05

    Garage Door Stop Weatherstripping

    Off-white garage door with weatherstripping vinyl installed to wood door side molding

    The Spruce / Meg MacDonald

    Wind and rain can also get into the garage around the sides and top of the garage door. To prevent this, garage doors usually have rubber or vinyl weatherstripping installed onto the wood door stop molding that is attached to the door jamb and nearly touches the front face of the door.

    Install new weatherstripping onto your door stops if your garage door doesn't have it or if it has old, worn stripping that no longer seals against the door. New weatherstripping comes in rolls, and you can easily cut it to length with a utility knife. It installs with galvanized nails or screws. The door-side flange of the weatherstripping should press against the door to create a good seal.

  • 04 of 05

    Vinyl Door Stop With Integrated Weatherstrip

    Vinyl door stop with integrated weatherstrip drilled to wood molding in front of garage

    The Spruce / Meg MacDonald

    Door stop molding with weatherstripping is a great option for doors that have old, rotted, or damage door stops that need replacing. This specialty stop molding typically is made of vinyl and has a wood-look molding strip and a flexible weather-seal flange all in one piece. It cuts easily with a saw and installs with galvanized or stainless steel siding nails.

    To install the door stop, position each piece parallel to the door face, and push the molding toward the door so the weatherstrip flange is slightly compressed against the door, and then fasten the molding to the door jamb with nails. Typically, it's best to install the top molding first and then overlap the ends of the top molding with the side stops.

    Continue to 5 of 5 below.
  • 05 of 05

    Garage Door Panel Weatherstripping

    White garage door panel with v-shaped weatherstripping closeup

    The Spruce / Meg MacDonald

    V-shaped garage door panel weatherstripping is designed to seal the gaps between individual door panels. This can be particularly helpful on older wood doors with panels that have flat edges. (Newer metal and fiberglass doors usually have interlocking edges to prevent air intrusion.)

    Door panel weatherstripping is sold in rolls and is self-adhesive. You simply stick it to the top or bottom edge of each panel. When the door is closed, the panels compress the weatherstripping to create an effective seal, much like weatherstripping on standard house entry doors.

  • Why put weather stripping on a garage door?

    Adding weather stripping to your garage door will keep out dirt, rain and other inclement weather, plus deter bugs and other critters from coming in. It also will keep the air inside where it belongs and the outside air out.

  • How long should weather stripping on a garage door last?

    Quality weather stripping should last for two to three years, possibly longer, on your garage door before it should be replaced.

  • When should you replace the weather stripping on your garage door?

    If you notice your garage door's weather stripping is cracking, is torn, or has rips in it, or you feel a breeze or dirt coming in around the door, it is time to put new weather stripping on.