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How to Sound Dampen a Car

How to Sound Dampen a Car

Making a new car quiet is impossible since it’s a moving object. However, you can apply some mechanisms to reduce the noise and peacefully listen to your audio

music while driving. As such, this article will guide you on how to sound dampen a car.

Sound dampening, also known as soundproofing or sound deadening, is applying damping material to alter sound vibrations. Sound dampening serves three purposes in a car.

Take a look;

I’ll walk you through DIY car sound deadening tips to enjoy the above benefits.

What Leads to Noise in the Car

black 2-DIN head unit

Various factors lead to noise in a car. Some of the main factors are;

  • Car models

Electric vehicles produce less noise because they don’t have internal combustion engines. On the other hand, some cars with internal combustion engines are quieter than others. For instance, petrol-powered engines are less noisy compared to diesel ones.

  •  Road quality

Rough roads will cause more vibrations than smooth roads, same with gravel or sandy areas.

  • Tires

Low quality or worn-out tires will cause more vibration in the car. Tires are essential since they come into contact with the road surface and support the whole car.

  • Vehicle age

If your car is old, it’s more likely to produce more noise due to loose and worn-out parts.

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vehicle stereo turned on

How to Sound Dampen a Car

Sound and other vibrations travel through materials with various intensity levels. If these vibrations’ frequency matches the material traveling through, it’s amplified.

So, applying a dampening material on the amplifying surface alters the resonating frequency,

making it less noisy. In other words, the dampeners will remove dynamic stresses to downgrade vibration energy.

Ways to Sound Dampen a Car

Various areas of a car require different sound deadening sheets. Below, the article will discuss various locations and the appropriate methods to apply the dampening materials. Let’s dive in;

1. How to Sound Dampen the Engine

The engine is believed to produce nearly 40% of the car noise. And since the engine is by far different from other car components, you need quality dampening material. Take a look at the features;

  • Ability to stick under the bonnet.
  • Heat resistant.
  • Able to protect the engine from oil, fuel, grease, and other substances.

With that said, I recommend Noico Black Mil 36 square feet car sound deadening mat. It’s a butyl-based aluminum foil used in all car types.

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Step 1: Switch off the engine and open the bonnet.

Step 2: Thoroughly clean the bonnet with alcohol-based substance and a cloth to enhance adhesion.

Step 3: Measure the bonnet area and cut the Noico sound dampener material of the same size.

Step 4: Stick the material under the bonnet and allow its glue to dry up for 5 minutes.

Step 5: Close the bonnet and start the car engine to test.

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person hand holding iPhone 6 on dashboard during daytime

2. How to Sound Dampen the Floor

I recommend Siless liner 157 mil 36 square feet sound deadening mat for the best floor insulation. It’s made of rubber material that is comfortable for the floor.

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Step 1: Remove the original car floor mats.

Step 2: Measure the area and cut the same siless sound deadening mat using heavy-duty scissors.

Step 3: Lay the mat and let the glue dry up for around 5 minutes.

Step 4: Replace the original car mats.

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3. How to Sound Dampen the Car Doors

To enjoy a quiet and peaceful ride, you shouldn’t skip sound deadening car doors. The doors require an adhesive backing material, waterproof, and good insulation capability.

With that said, I recommend KILMAT 50 mil 50 square feet Car Sound Deadening Mat.

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 Step 1: Use a screwdriver to remove the door panels. The mounting mechanisms may vary depending on the manufacturer.

 Step 2: Measure the door interior surface and cut the KILMAT sound dampener of the same size using scissors.

 Step 3: Cover the interior without interfering with the wiring or the locking mechanisms.

 Step 4: Install the door panels and test the door locks and window rolling systems.

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4. How to Sound Dampen the Roof

The roof produces the most noise due to wind. Secondly, insulating it will reduce the sun’s heat. I recommend the Noico Black Mil 36 square feet car sound deadening mat for the best noise and heat insulation.


 Step 1: Remove the cloth headliner from the roof carefully.

 Step 2: Measure the roof and cut the same Noico sound dampener material.

 Step 3: Rub the roof with alcohol-based substance and a sponge to remove dust and debris and stick your mat.

 Step 4: Reapply the cloth headliner with adhesion. 

 5. How to Sound Dampen the Trunk

The truck is notorious for bringing most noise into the cabin. I recommend the siless deadening mat for trunk insulation.


Step 1: Remove all items from the trunk, including its carpeting.

Step 2: Remove the tailgate panel using a screwdriver and measure the lengths on the areas.

Step 3: Stick your siless mat, then install the carpeting and the tailgate panel.

Step 4: Test the locking mechanisms.

6. Change the Car Tires

Car tires have a huge impact on road noise. Bigger-sized tires have more rubber which absorbs and reduces vibrations compared to small tires.

Secondly, smaller-width tires cover less road surface compared to broad width. As such, they minimize vibrations.

FAQs on Sound Deadening a Car

Is it Worth Sound Deadening a Car?

Considering the comfort, quietness, and insulation you offer to the car interior; it’s worth paying the cost. Note quality sound deadening materials are the first consideration if you want the benefits.

Does Flex Seal Work as Sound Deadening?

Flex Seal is a liquid rubber spray sealant used to seal leaks. However, its rubber is dense enough to absorb sound vibrations.

What Thickness of Sound Deadener is Best?

100 mil is considered the supreme, 80 mil the mid, and 50 mil the standard. The thicker the material the better the results if you intend to sound dampen a car. 

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