6 Simple Ways to Soundproof Interior Doors

The importance of realizing what is the difference between interior and exterior door is huge, especially for soundproofing purposes.

Unlike exterior doors that are built of solid wood, interior doors usually have a hollow core.

With that said, it’s easy to conclude that exterior doors are quite heavier, massive, while interior ones are frankly lighter.

This reflects into interior doors soundproofing power. They are a lot easier for the noise to pass through, unlike exterior doors.

Therefore, they require a bit more soundproofing.

I had interior doors all over my first apartment, and it was highly noisy.

You could hear anyone without any problems behind those doors like there were no doors at all. So, I have found out about a couple of solutions.

Of course, changing doors is somewhat expensive, so soundproofing is a great alternative.

In this article, I will explain basics of soundproofing interior doors, and hopefully help you solve your problem in the most effective way.

So, let’s get to the point.

soundproof interior doors

6 Steps to Soundproof Interior Doors Effectively 

Some of these methods are quite usual when it comes to soundproofing doors.

However, interior doors function differently from other doors as they are (most commonly) sliding or folding. Therefore, as the structure is a bit different, the soundproofing process is slightly different as well.

1. Put soundproofing blankets

Wait, what? Blankets on the doors?

Yes, you heard me well. I was sarcastic about them as well, but soundproofing blankets (moving blankets) are an effective solution to the noise problems.

Moving blankets or some may call them acoustic blankets are well-known for their sound-absorbing capability.

They are extremely thick blankets, designed for the purpose of soundproofing that will absorb any sound on its way to your room.

Hanging these on your sliding doors might solve your problem completely or at least cut the noise in half.

It’s quite logical and natural- the more layers there are, the better the insulation is. Therefore, adding an extra layer of defense to your doors will reasonably decrease the noise.

Usually, one layer of moving blankets is enough, but if you are still hearing the noise, feel free to add more.

Moving blankets, or acoustic blankets are quite big, and they belong to an affordable price point category. You can find some samples for like $30-$40.

It’s quite an inexpensive solution to the noise, and in most of the cases effective. Of course, it all depends on the noise level.

Frankly, I do not prefer their design, but there are some beautiful as well that you should check out. Not only that you will benefit from noise insulation, but these blankets can add to your room’s overall appearance.

Nevertheless, you can use them as a great solution to the thermal leak.

2. Use acoustic panels

There is another way to add some soundproofing mass to your sliding doors. Acoustic panels are frequently used in soundproofing studio purposes.

acoustic panels soundproof foam

You need to know that there are two main types of acoustic panels. The first ones are foam panels, and the second fiberglass panels.

Foam panels are quite impressive in reducing the echo, while fiberglass panels are highly effective in blocking the noise.

Therefore, I recommend using these fiberglass panels. Of course, you can use both in order to reduce the echo and block the noise.

However, fiberglass panels cost a bit more but on the other hand, they are much effective in this interior doors noise problem.

Also, fiberglass panels impact the appearance of the room. They are much more beautiful than the foam panels. You can choose, because they come in different designs and colors, to fit your interior.

These panels should reduce the noise coming through your sliding doors. Nonetheless, they are great for low-frequency noise, and vibrating sounds.

Fiberglass panels are shockproof, moistureproof, and great thermal insulators as well. Therefore, you will not only benefit from the noise reduction but with several other things as well.

They are a bit tricky to install. If they are not self-adhesive, you can seal them using green glue, or you can utilize these command strips to attach them properly. One or two strips on the back of each panel should do the work.

Whether you use command strips or green glue, you will attach those panels successfully.

Now, the difference will show up later on when you decide to remove them. It will be quite easier to do that if you go with strips.

Panels are somewhat cheap, but make sure that you measure the doors before ordering. Don’t hesitate to buy a bit more- you can always cut the panel and fit it perfectly.

Here is the difference between regular doors and the interior ones. Hanging strips are not the best solution when it comes to regular doors.

Since they are widely opened and closed more often, there is a risk of hanging strips falling off.

On the other hand, that can’t happen on the sliding doors.

All in all, these panels are used in the music industry, to soundproof studios. They will surely help you soundproof your interior doors as well.

3. Seal the holes and cover the gaps

Now, you already know that any opened spaces can release the sound and cause too much noise.

When regular exterior doors can release a lot of noise, imagine what interior doors can do with even bigger gaps.

Since interior doors are different from the regular ones, they are full of gaps, and you can’t really use some methods that you can use with regular doors.

Do not despair; there are other methods that you can try. For example, small gaps in the door frame can be gaped with this weatherstripping tape.

Once done, there is a harder part. You will need to soundproof that space between the doors and the floor.

As we mentioned, some methods can’t be applied as these doors need to slide. However, if the gap between the floor and the doors is a bigger one (larger than it should be), then you can use an adjustable door sweep.

Basically, I’m not a fan of door sweeps when it comes to interior doors.

However, if you decide to go with this one, you should probably aim for the most versatile one. It is self-adhesive, and you will easily do it yourself.

Pros of having a door sweep on interior doors:

  • Thermal leak reduced
  • Bugs and insects prevented from infesting your room
  • Noise reduction

Cons of having a door sweep on interior doors:

  • It might make the sliding quite difficult 


4. Hang some soundproofing curtains 

Curtains on the doors? Well, why not? If it can solve your noise problem, I don’t see the problem. They are quite beautiful with different designs and colors.

However, soundproofing curtains are great noise fighting products. They do require a bit more effort, but in the end, it’s all worth.

With the thickness that they offer, the noise will be reduced drastically. They are often used for soundproofing windows, but you can use it for these purposes as well.

The first thing that you need to do is install a curtain rod. Once installed, you would want to buy eyelet curtains. They are a lot easier to install. Simply hang it on the rod through those eyelets.

In order to reduce the noise make sure that the curtains are enough big to cover the doors completely. They are extremely effective in reducing airborne noise.

Of course, it all depends on the level of the noise. Be sure that soundproofing curtains can effectively deal with the medium-to-high sound frequencies.

On the other side, they are not so good against low frequencies.

soundproof curtains

5. Purchase a barn-door sliding doors

As I already mentioned, the thickness and material of your doors matter a lot.

So, even though sliding doors are commonly made of glass or hollow wooden, you can improvise with the material and purchase some solid wood.

Of course, there is one problem with this solid wood- the price.

Since it goes around $300, it’s quite a big investment. I mean, it’s big considering other methods.

You can purchase some panel, or use any other method for an at least 10x smaller cash investment.

6. Use a combination of methods

If you are really persistent to deal with this noise problem, then you can simply use various methods at once. Combine several of them and you will surely decrease the noise.

For example, use fiberglass panels and soundproof curtains. That will remove the noise by 60-90% on average, if not completely. As we said earlier- the more layers of defense, the better.

On Soundproofing Interior Doors

In the light of everything aforementioned, soundproofing interior doors is not a rocket science. True, some methods can be annoying and require a bit more effort, but in the end, peace is priceless, right?

If we put aside a method of buying a solid wood panel for your new interior doors, all of the other methods are quite cheap and affordable. No more than $50 should be spent (tops).

Therefore, I hope that this article made your life and your room peaceful.