Knowing how to seal a garage door from the inside will help you steer clear of insects, rodents, rainwater, wind, in addition to soundproofing the garage better.

For some people, a garage is not just a place for cars and miscellaneous tools. It might be where they spend a large amount of time relaxing, woodworking, or even creating music. For that reason, they may want to enhance the soundproofing capability and energy efficiency of the area.

The good news is there are a couple of methods you can try to seal the garage better, and the garage door is a good starting point.

You can work with the bottom, the threshold, sides, or top of it, and the most important thing is that you should fix all the air gaps for ultimate sealing efficiency.

Best Ways to Seal a Garage Door from The Inside

1. Sealing The Top Of Your Garage Door

sealing the top of the garage door

All garage doors have operational gaps at the top, which is evident while you’re standing inside with the door closed and lights off.

While insects are not likely to intrude your garage via this entrance, these gaps a great source of sound and heat transference from the inside to the outside. For that reason, your heating system will work harder to balance out the heat difference, adding the utility costs.

Sealing the top of your garage door is just as important as other areas such as sides, floors since if the space is not airtight enough, every sealing effort will go to waste.

Sealing The Garage Door Top Instructions

  • It would be best if you disengaged the automatic opener so that you can operate the door manually
  • Wipe the surface on the top until you have a fully cleaned surface
  • Ensure the stronghold with the double-sided tape to your top seal
  • Laying the top seal with the side being fixed facing up
  • Cut the double-sided tape into short pieces and affix them to the upper sides of the seal. Three to four pieces will suffice
  • Peel the back of the tape when ready to install
  • Apply even pressure along with the seal until it’s in place and proceed with the next seal
  • The last length of the seal needs to be measured and cut to fit
  • Cut the aluminum to the required length using a hacksaw
  • Try to make sure the cut edge is not going to be a joined end
  • Now with the stop seals fitting, carefully remove the vice grips

2. Sealing The Garage Door Sides

sealing garage door sides

Any gaps on either side of the door can also let the noise escape the room, bugs, snow, dirt intrude the place. Therefore, you need to seal them properly to avoid such calamities.

Virtually anyone can install weatherstripping without the help of a professional, and this task is not at all a sophisticated DIY.

Most weatherstripping for garage door sides is made of vinyl, which is cost-effective and easy to use. The seal often comes in a roll, meaning you may want to fatten it out before sticking it to the edges.

Otherwise, it won’t lay flush with the sides of the door, which in turn won’t give the door an attractive finish and, even worse, won’t work properly to soundproof and weatherproof the garage.

While some seals use rubber adhesive to affix to the edges, others might work with roofing nails instead. The former is more preferred as it’s more convenient and easy to install.

The latter is not everyone’s cup of tea as it won’t give a neat look to the door despite holding the seal for a longer period than adhesive.

Instructions to Seal a Garage Door on the Sides

  • Take the measurements of the sides to choose the exact size of tape
  • Clean the edges, remove any dirt and debris. Allow the edges to dry before you install the tape. Otherwise, the adhesive won’t work
  • Apply adhesive on one side of the weatherstripping tape
  • Adhere to tape to the edges and close the door. Allow it tape to settle for at least 24 hours

3. Sealing The Garage Door Bottom

sealing the bottom of the garage door

Weatherproofing the door bottom is one of the most viable answers to the question of how to seal a garage door from the inside.

A garage door bottom gasket is a long strip of vinyl or rubber that affixes to the door’s bottom edge. It serves both as a buffer for your door against the floor every time it comes down and a seal to keep debris and dirt from coming in.

A worn-out bottom seal will let the daylight in below the bottom when the door is closed.

Most metal doors will have an aluminum channel on the bottom into which you can slide the seal for installation. This channel typically holds a U-shaped rubber gasket, referred to as a T-style seal.

The best thing about this type of gasket is that it is easy to install and comes in various sizes to accommodate gaps of different heights.

Sealing The Bottom of Your Garage Door

  • Measure the length of the door. It’s advisable to buy a seal with a length exceeding the measurement by at least 6 inches
  • Disengage the automatic opener so you can operate the door manually
  • Remove the channel using a screwdriver or socket wrench
  • Pull the old rubber seal off the track
  • Clean the track using a rag and soapy water to get rid of any residue
  • Lubricate the track with some dish soap, then slide the gasket into it track with its ridges facing upward
  • Trim off any excess seal with utility scissors
  • Push the trackback to its place and activate the auto opener

4. Garage Floor Seals

garage floor seals

A floor seal basically serves the same function as the bottom seal. However, it’s fixed to the ground surface instead of the door.

In addition to keeping out dirt, debris, and creepy-crawly creatures, a floor seal is important to prevent the water from coming in, especially when your driveway slopes down toward the garage.

Sealing The Garage Door Floor

  • Choose a good-quality vinyl threshold seal
  • Clean the area where you’re going to lay your floor seal
  • While waiting for the floor to dry out, lay flat the seal for easy installation
  • Close the door from the inside, then slide the seal under it towards the street until you get a close fit
  • Draw a line on the surface along each side of the seal, then move it off
  • Apply the adhesive and position the seal between the lines. Apply some pressure to secure it in place
  • Close the door to apply continuous pressure on the seal and allow it to cure within the next 24-48 hours
While the floor seal stops water from going into the garage, it also blocks it from flowing out. For that reason, hosing out your space or sweeping dirt might be a challenge.

5. Insulating The Garage Door

Insulating The Garage Door

As the garage door frequently opens, garage door insulation doesn’t seem a good idea unless you’ve got a detached garage or use it as a living space.

If you spend a considerable amount of time in your garage, you may want to cool or heat the area, and optimizing the door’s R-value or other things such as floors, walls, or ceilings will totally make sense.

Insulating the door will maximize the energy efficiency of the space while helping you stay away from the street noise.

Wood and metal are the two most common materials for garage doors. Metal garage doors can be a go-to choice for many homeowners, but they don’t have a decent insulation level as wood garage doors.

Hence, if you have the metal door installed, it makes perfect sense to throw in some insulation boards.

Garage door insulation is an effective way to soundproof and weather-seal the area. Yet, you’ll not get the optimal value if window weatherstripping, floor gaskets, and other air gaps are available, allowing the noise and air transferring from inside.

Thus, it pays to give these areas a tight seal altogether for the most effective noise reduction.

You can find the two most common types of insulation kits available at any home improvement store.

A vinyl-faced fiberglass batt insulation, offering an R-8 insulation value. Two kits will be sufficient for a standard door of 16-foot wide. Another kit is expanded polystyrene rigid foam panels (EPS) with an R-4 insulation value.

How to Insulate a Garage Door

  • Measure the panel and use a marker to mark the center of each panel. Then stick the retainer clip using double-stick adhesive at that point. Go over all the panels and use two clips for a large panel if needed
  • Cut the insulation board according to the width and height of the grid panels using a utility knife and straightedge. It’s advisable to add a couple of inches
  • Adhere the foam board to the panel frame
  • Identify the retainer clips and press the other half of the clip to secure the insulation board. Go on until you get all the boards successfully tucked in the frame


Hopefully, you have an idea of how to seal a garage door from the inside after reading this article.

Sealing a garage door is a fairly simple DIY project that won’t take you more than two days. It involves replacing old seals (if there are any) and affixing new ones to the sides, top, bottom, and threshold.

There will be only some trimming and cutting in the process, but the most important thing to bear in mind is to ensure the automatic opening mechanism shuts off and the garage door itself is secured in place while you’re doing the job.

A well-sealed garage door won’t let any daylight permeate inside when closed. That’s when you can enjoy working inside and without dealing with any noise issues with your neighbors.

You might also want to read:

Write a Comment