How To Seal a Garage Door from the Inside

Gaps around doors provide easily accessible entryways for dirt, moisture, and pests into your home. 

It is no different for your garage. 

In this article, we will go over some easy ways on

  • How to seal a garage door from the inside.
  • Why you should seal garage door gaps.
  • Others way to seal and insulate your garage door.

All that you will need to seal your garage door is the type of seal you decide to use, and depending on which style you choose, you may need to purchase adhesive glue, nails, or screws. Usually, the seal will come with screws if required.

You might be asking yourself: how do I know if my garage door needs sealing?

Well, it is actually quite simple to find out.

All you need to do is stand inside your garage with the door down on a sunny day and see if any light comes sneaking in through the cracks.

Where the light comes through is where you will definitely want to seal. 

But if you wish to have your garage door completely sealed, you will need to seal around the entire frame of the garage door, top to bottom and side to side.

If the noise coming from your garage door when opening and closing is driving you up a wall, then check this best quiet garage door opener post.

Table Of Contents

How to seal a garage door from the inside: two easy ways

You can seal a garage door from the bottom and from the sides and top. 

The good news is both ways can be done with minimal work on your part.

 I will walk you through how to seal garage door sides and top and garage door bottom below.  

How to seal garage door sides and top

While the bottom of a garage door stands out to most people as an area to seal, it is equally as important to seal garage door gaps on the sides and top. 

Sealing garage door sides

Over time the wear and tear from everyday use can create gaps in the frame allowing dust and moisture inside. The easiest to fill these gaps is to seal the garage door sides with weatherstripping. 

First, you should buy weatherstripping like this foam insulation tape:  

Once you have measured the inside of the door frame jam, you can cut to length the insulation tape.  Make sure you have measured correctly to avoid having to redo any work.

If you are using the insulation tape above that we recommended, you just need to peel away the stripping to expose the adhesive and press into place.

Otherwise, different styles of weatherstrip require you to purchase adhesive glue, which requires time to settle and bond.

Which is another reason why to buy our recommended foam insulation tape. It adheres instantly, so there is no waiting around 24 to 48 hours waiting for the glue to dry. 

And it also performs below freezing temperatures and way above a hundred degrees. 

The foam insulation tape has been measured, cut, and set in place. You’re good to go, nothing more to do.

You have now sealed and insulated your garage door sides, so no unwanted moisture, cold, or noise gets through those gaps.

Sealing garage door tops

Of course, you can’t seal garage doors without also sealing the top. Any gap will let in the outside elements you are trying to keep out.

For this job, you will need a garage door top seal.

A garage door top seal is a rubber strip that presses into the top of the frame when the garage door is down, conforming to the shape of the door. 

A garage door top seal’s best benefit is insulating your garage. As the warm rises in your garage, it will no longer have a wide gap from which to escape. 

Some garage door top seals have an adhesive back like the side seals, but many require nails or rubber adhesive to hold in the place.

The top seal we have recommended here comes with nails. 

Again, you want to measure the width of the top of your door frame and cut the seal to size. 

Then you will line the top seal so that the lip hangs over the edge and place a nail about every four inches, allowing the garage door to seal it into place when closed. 

how to seal garage door partially open green garage door industrial hanging lights white walls

How to seal a garage door bottom

Now that we have gone over how to seal your garage door sides and top, we will cover sealing garage door bottoms.

There are several ways to seal a garage door bottom. 

But all of them do one of two things: they either seal the door by laying a strip on the garage floor or they seal the door by attaching to the bottom of the door. 

I will go over three easy and inexpensive ways to seal the bottom of your garage door.

Garage floor seal

A garage floor seal is a rubber strip you place across the threshold of the garage. 

The floor seal has a raised lip on the inside of the garage when the door is down. This raised lip seals garage door gaps by sitting directly against the door bottom.

The garage floor seal blocks any dust, pests, cold, or rodents from getting through the gaps along the bottom of your garage door.

Installation is easy:

  • Measure the width of your garage door frame and cut the floor seal to size.
  • Sweep and clean the garage floor entrance to prevent dust from being underneath the seal.
  • Then lift the garage door slightly and place the seal underneath so that the thin side sits directly underneath the door.
  • Make sure that when the garage is closed, the raised lip sits snug up against the door.
  • With the floor seal in place under the closed garage door, use chalk to mark the floor where the seal will go.
  • Remove the bottom seal, then cover the floor with adhesive glue in a criss-cross pattern where the seal will be placed.
  • Press the seal firmly down and leave to sit for however long recommended by the makers of the product.

Door bottom seal

A door bottom seal is a U-shaped strip that clicks to the bottom of the garage door. The best part, door bottom seals do require any gluing or nailing!

Simply measure the width of your garage door, cut the strip to size, and snap into place.

Now, your garage door is sealed along the bottom. 

Simple as that.

Garage door bottom brush seal

Another bottom door option is to attach a door brush. Unlike the U-shaped door bottom seal, a brush seal requires you to screw the seal into the door. 

This style of a seal is most effective when you have a noticeable sized gap at the bottom. For instance, because the bottom of the door has rotted away or the floor itself is warped or has cracks.

Brush seals splay out, conforming to any surface, perfect or imperfect. Brush seals provide a barrier against dirt, pests, and outside elements.

They are also easy to install.

  • Remove any existing seal or trim.
  • Measure the door and match the brush seal to size.
  • While the door is closed, line up the seal so that the brush is touching the bottom. 
  • Mark the door where you will drill the holes.
  • Since most brush seals have pre-drilled holes, you can move the seal up and down to find the perfect height for your garage. 
  • Tighten screws and you’re done.

If you are someone like me who doesn’t do a lot of home repairs, then watch this video to help give you confidence.

Installing a seal door brush is simple to do, but anything that requires putting in screws or nails always makes me nervous.

The thought of putting unwanted holes that I then have to fill gives me hesitancy, and I want to make sure that I am installing things correctly.

Hopefully, this video will help lessen these fears and ensure that you are screwing the door brush on correctly.

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Why seal garage door gaps?

You should seal garage door gaps to keep out dust, dirt, pests, cold air, etc. 

This can save you time cleaning your garage. And let’s all be honest, no one enjoys having to clean out the garage.

The other benefit of sealing garage door gaps is that it can help with your utilities. Keeping out cold air can help, as well as keeping in warm air can reduce year-round utilities.

Not to mention, you can create a better-insulated garage, which is a perk if you use your garage as a workshop. 

I have mainly talked about garage doors, but if your garage also acts as a workshop, then you will also want to soundproof and insulate the door from the garage to your house. 

You might also want to check our post on how to soundproof a door easily. Here we go over types of doors and easy ways to soundproof and insulate your doors.

It will help with energy efficiency while also helping to block noise in your workshop from annoying people in the house. 

The final reason I suggest sealing garage door gaps is to help block out noise from outside. Gaps allow sound to find a way in and out of the garage. 

Sealing your garage door is one step to creating a space where you can work without noise from outside bothering you and your noise from annoying your neighbors.

If blocking out noise is a priority to you, but you never looked into what you should soundproof in your home, let alone how to soundproof your home.

Then you consider our article on how to soundproof your home from your noisy neighborhood.

Gaps in doors and windows let noise, dust, air, moisture, and pests into your home. Sealing these gaps in the ways discussed above will help weatherproof and soundproof your home.

What types of garage door seals and insulation are there?

I have gone how to seal your garage door from the inside and the various types of seals you can use to fill the gaps. 

If your goal is to not just keep outside elements from getting inside but also reduce noise and improve energy efficiency in your garage.

Then stopping at garage door seals will not get all the way there.

You should consider insulation. 

Here is a helpful DYI Project on how to insulate a garage door. Installing insulation, like the door seals, basically involves choosing a type of insulation, getting precise measurements, and cutting to size.

For a detailed explanation of the kinds of insulation you can choose from check Energy.gov. This site discusses each type, where you want to install them, and their R-values. 

R-value is a term that measures the effectiveness of the insulation. The higher the R-value, the higher the insulation’s effectiveness.

Here are the most common types of insulation.

Foam board insulation

These provide high insulation without being very thick. They come in panels made from polystyrene. These panels can then be easily cut down to whatever size you need for your project.

Reflective insulation

This kind of insulation usually has a reflective foil on both sides made from aluminum, and some sort of bubble or cardboard in between.

This kind of insulation usually has a reflective foil on both sides made from aluminum and some sort of bubble or cardboard in between.

What reflective insulation does is exactly what it sounds like. It reflects heat back rather than allowing it to pass through the insulation. 

During the summer, this kind of insulation can reflect heat from outside, keeping the garage cool.

And during the winter, reflective insulation will reflect heat back into the garage, helping to keep it warm.

Batt insulation

There are several kinds of batt insulation. They can be made of fiberglass, natural fibers, or plastic fibers, though fiberglass is most commonly found.

It comes in rolls. The batting comes between paper or foil. 

It also comes in different thicknesses. The thicker the batting, the higher the R-value.

Thicker equals better insulation, but it also means higher costs.

You can use this kind of insulation if your garage door has sectioned panels that act similar to wall studs.

There has to be a space between two beams or edges where the batting can fit. You’ll have to measure the depth your garage door has to find a batt insulation that will match.

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