How To Soundproof A Car Trunk From Irritating Noises

how to soundproof your car trunk

The trunk noise can muddle you a lot while on a trip with your family and friends.

Besides it disrupting your focus on the roads, it is a problem for the rear passengers as well.

If you are traveling with your children, then the noise can really be so loud for them.

I don’t think, you will enjoy a trip with your family with so much noise from your car trunk.

Do you know?

About 3000 people die in crashes every year in the U.S. only due to a distracted driver.

According to National Highway Traffic Safety Administration (NHTSA), in 2018, 2,841 people were killed and around 400,000 people were injured in motor vehicle crashes involving a distracted driver.

Hence, the noise from the trunk is a serious problem as it can disturb your focus on the roads, and soundproofing it is important to have a safe and joyful ride with your family.

We have seen why trunk sound treatment is important.

Now, the next question is how to actually soundproof it?

Don’t worry, I have covered all your queries below in this article and the step-by-step process to soundproof your car trunk.

how to soundproof a car trunk

Benefits Of Soundproofing Your Car Trunk

benefits of soundproofing your car trunk

If you have made up your mind to soundproof your car trunk, then a natural question that comes to your mind is, what will I get from doing all that?

What is the benefit of soundproofing my car trunk?

There are various benefits of soundproofing your car trunk. They are:

  • You won’t hear tire and road noise in your cabin.
  • You won’t hear rattling noise from the trunk.
  • You won’t hear that peep noise from the trunk.
  • Soundproofing your car trunk will provide you with a better sound stereo.
  • Soundproofing your car trunk will help you to keep the interior temperature warm in winter and cold in summer.

Why Is Your Car Trunk So Noisy?

why is your car trunk so noisy

Did you notice, when your car was new, the trunk didn’t generate a lot of noise?

But after a few months of use, you start to hear some noise from the trunk. The sound coming from the trunk increases periodically as your car gets older.

New models have done so well in making the trunks passably soundproof, but for a limited period of time. With time they too start to produce a noticeable amount of noise.

But that’s not the case with electric motors.

Electric vehicles are the quietest vehicle to exist, they don’t feel to be moving at all.

It’s good news if you have an electric vehicle, but if not, and your car trunk making noise, then you need to look for the three major things:

  • The mechanical parts of the car
  • The noise from the tire
  • And the Mother Nature

If it’s not been too long since you started to hear some noise from the trunk, then you need to check the mechanical parts of the vehicle.

Sometimes, a loose part can generate a hearable amount of noise, and fixing that can solve your problem.

2 out of 5 times the problem can be solved by just fixing the mechanical parts of the vehicle.

However, if you are still able to hear the noise from the trunk, then that’s the time when you seriously need to soundproof your car trunk.


Quick, Cheap And Easiest Way To Quiet A Car Trunk

Not everyone who wants to soundproof the car trunk has:

  • Large budget
  • Enough time and
  • Expertise

What to do now?

You can still soundproof your car trunk effectively if you fall in any of the other categories.

To do that, you’ll only need some soundproof blankets and mats.

Using soundproof blankets and mats is the cheapest way to stop the trunk rattle.


Soundproof Blankets

If you have soundproofed anything earlier, then you would know how useful, cost-effective and easy it is to soundproof anything using a blanket.

Soundproof blankets are multilayer blankets whose interior layers are made of fiberglass/mineral wool material, which helps to absorb approximately 50-80% of any sound.

So it makes sense to use them in the car trunk too.

Firstly, remove all the materials from your trunk and then simply put the blanket on the trunk surface.

Then stick the blanket to the surface with the help of glue.

Confirm that the blanket sticks well to the surface and don’t leave any gap between the blanket and the trunk surface, as it will allow the noise to come in.

While soundproofing the trunk, pick a blanket that’s thicker than the regular blanket, as it will absorb more sound.


Soundproof Mat

Just like the blankets, soundproof mats are also very good at absorbing sound.

In addition to that, soundproof mats are much stronger than blankets, so you don’t need to worry about them getting damaged.

If you have a subwoofer in your car trunk, then you definitely need to use soundproof mats in your trunk.

Because of the subwoofer, there’s a chance that the blanket might get damaged, but that’s not the case with mats as its base is much stronger than that of the blanket.

You simply need to place the mat in the trunk and stick it to the trunk surface with the help of glue.

Don’t leave any gap between the mat and the surface of the trunk just like the blanket.

Soundproof mats are available in different sizes for different models of cars, but if you are unlucky to find one that fits well in your car trunk, then you can buy some small mats and stick them to the surface of the trunk.


Are soundproof blankets and mats enough to completely soundproof your car trunk?

Soundproofing the trunk with the help of blankets and mats is a good option if you don’t have enough money and time to devote to the soundproofing project.

But they hold certain drawbacks too:

  • They are not efficient enough to completely block out all the noise from the trunk. They will help you to block unwanted noise up to a certain point.
  • You regularly need to check if the blankets and mats are properly attached to the surface.
  • You need to check if the blankets and mats are getting damaged.

Soundproofing the trunk with blankets and mat is a temporary solution.

But if you are really concerned about the sound coming from the trunk, then you need to completely soundproof your car trunk in a more professional manner without worrying about the investment.

Now let’s look at the professional way of soundproofing your car trunk.


How To Soundproof A Car Trunk From Irritating Noises

It’s not possible to enjoy a ride with your family and friends with so much noise from the trunk.

So, it’s important to soundproof your car trunk to get rid of those unwanted noises.

Let’s begin with the initial preparation to soundproof the trunk.

1. Initial Preparation To Soundproof The Trunk

Firstly, before actually soundproofing your trunk, you need to remove all the items from the trunk, like the subwoofer, tool kit, spare tire, carpet, etc.

Then carefully remove all the panels inside the trunk.

You can also buy a panel removal kit to ensure you don’t break the panel in the process.

After removing all the materials from the trunk, you need to clean the trunk surface thoroughly so that the soundproofing material can sit properly on the surface.

You can use a degreaser to clean the trunk surface.


2. Selecting The Right Acoustic Materials

Have you decided on the soundproofing materials that you are going to use inside the trunk?

But before choosing the material, you should know how much material do you actually need.

So, start with measuring different areas of the trunk, like the trunk surface, the walls of the trunk, the top of the trunk and don’t miss out on the trunk lid.

Covering 60% of the trunk will be enough to get rid of those unwanted trunk noises.

But, if you have a subwoofer in your trunk, then you need to entirely cover the trunk to get satisfactory results.

Now, after knowing how much material do you need, the next step is to choose which material do you want to use in your trunk.

There are a lot of soundproofing materials available in the market, but you can’t actually use all of them inside your trunk.

Using sound deadening and sound insulation layers in your trunk will be enough to block out unwanted noises.


3. Apply The Sound Deadening Layer

Now, after choosing the material and knowing how much material do you need, the next step is to apply the sound deadening layer to the trunk.

You can cut the sound deadening layer into small squares using a utility knife to make it easier to apply as the trunk geometry is not even.

Make sure that the sound deadening layer properly adheres to the trunk.

To do that, you can use a hand roller to apply the deadening layer firmly on the surface.

Now, if you don’t have a subwoofer in your trunk, then covering 60% of the trunk, walls, and lid would be enough.

But if you do, then you need to cover 100% of the trunk to get better results.


4. Apply The Sound Insulation Layer

Sound deadening material is usually used on the major parts from where you hear the maximum noise.

While the sound insulation layer is meant to be used on the entire part to block the noise completely.

You can apply the sound insulation layer on the cardboard shelf or the carpet that covers the spare tire.

But, if you want to completely soundproof your trunk, then you should apply the sound insulation layer directly onto the sound deadening layer to get better results.

After applying the sound insulation layer, you should look for any gaps inside the trunk and seal them with the help of foil tape.


5. Soundproof The Rattling License Plate

soundproof rattling license plate

You may wonder that how a license plate can make a hearable amount of noise.

The license plate usually rattles around, which creates a bit of noise, especially if you have installed a sound system in your car.

Now, how do you quiet a license plate rattle?

Soundproofing a license plate is just very simple, all you need to do is to install a silicon license plate frame.

They are very easy to install and work for a long time.

Using a silicone frame is enough, but if you want to make it even more soundproof, then you can consider adding some soundproofing material behind the holder as well.


6. Final Touches

After covering the trunk with soundproofing material, that brings us to the last step to reattach all the panels inside the trunk so it doesn’t look bad.

Don’t reattach the panel immediately, give some time for the soundproofing material to settle properly inside drunk.

Then look for excessive glue and foil tape and clean them.

You can also add a carpet to the trunk surface to increase the acoustic of the trunk even more.


Wrap Up On How To Soundproof A Car Trunk

soundproof car trunk

Soundproofing your car trunk is important to maintain focus on the roads to have a safe and joyful ride with the family.

Sometimes the noise can be reduced by just fixing some loose parts, but if that’s not the case for you, then you seriously need to soundproof your trunk to get rid of those irritating noises.

I have explained how to soundproof your car trunk and you will find no difficulty to do it yourself.

If you don’t have the budget to take up a soundproofing project, then I have also mentioned some cheap ways to soundproof your car trunk.

I hope this article helped you to soundproof your car trunk effectively and easily.


FAQ

Let’s look at some of the questions that you may have in your mind on soundproofing your car trunk.

Q1. How much does it cost to soundproof a car trunk?

If you are planning to soundproof your trunk using blankets and mats, then it would cost you not more than 300$.

But if you are going to use the professional method to soundproof your trunk, then it would cost you around 500$ to 800$.

Now, this is not the exact price; it can be higher or lower according to your needs.

Q2. Does the trunk interior go back in the same way, or does it not fit anymore?

Do you have the same question in your mind after applying the soundproofing material to the trunk?

But you really don’t need to worry about that.

The soundproofing material will create no difficulty in putting back the panels.

Reattaching the panels is a very simple process and you can do it without any issues.

Q3. Is it worth it to soundproof the car trunk?

Yes, it’s absolutely worth it to soundproof your car trunk as it helps to maintain your calm on the roads.

Besides reducing the noise, it also helps to improve the quality of the sound system in your car.

Q4. How to soundproof trunk for subs?

If you have installed a subwoofer in your trunk then you need to cover the entire trunk (100%) with sound deadening and sound insulation material.

You need to cover the trunk surface, the walls of the trunk, the top of the trunk, and the trunk lid with soundproofing materials to effectively soundproof your trunk from subwoofer vibrations.

After applying the soundproofing material the next thing you should do is to tighten the screw of the trunk and soundproof the license plate with the help of a silicone license plate frame, that’s all.

Now for another similar question, how to reduce trunk rattle from subs, the answer remains the same as mentioned above.

Q5. How do I install sound deadening in my trunk?

Adding sound deadening and sound insulation material to the trunk will help you reduce noise in your trunk.

Apart from noise, it will also help your car sound system to sound much better.

But how to actually do it? How to install the sound deadening material in your trunk?

I have attached a video below where it is explained that how can you install sound deadening and sound insulation material to the trunk.

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