How to Soundproof Car Trunk: Best Guide 2024

Do you want to enjoy a quieter and more comfortable ride in your car? Do you want to improve the sound quality of your car stereo system? Do you want to reduce the noise from the road, the engine, or the exhaust? If you answered yes to any of these questions, then you might want to consider soundproofing your car trunk.

But how do you soundproof a car trunk? What materials do you need? How much does it cost? How long does it take? In this blog post, we will answer all these questions and more. We will show you how to soundproof your car trunk in a few simple steps, using some of the best and cheapest soundproofing materials available. Let’s get started!

What can I use to soundproof my trunk?

To soundproof your trunk, there are several materials and techniques you can use to reduce the noise that enters or exits the trunk space. Here’s a step-by-step guide on how to soundproof your trunk:

How to Soundproof Car Trunk

Sealing and Inspecting: Start by inspecting your trunk for any gaps, holes, or cracks that might be letting noise in or out. Seal these gaps using weatherstripping, foam tape, or a silicone-based sealant.

Soundproofing Mats

  • Mass-loaded vinyl (MLV): MLV is a dense material that can be applied to the walls of your trunk. It adds mass and helps block sound transmission. Cut the MLV to fit the interior of your trunk and adhere it to it using a strong adhesive.
  • Acoustic Foam Panels: Attach acoustic foam panels to the walls of the trunk. These panels absorb sound waves and reduce vibrations. Use adhesive spray or specialized acoustic foam adhesive to secure the panels in place.

Carpet or Trunk Liner

  • Automotive Carpet: Adding a layer of automotive carpet or trunk liner can help absorb and dampen sound. Secure the carpet using adhesive or Velcro strips.

Resilient Mounts

  • Rubber Grommets: If you have components like a subwoofer or other equipment in your trunk, use rubber grommets or shock mounts to isolate them from the trunk’s metal frame. This prevents vibrations from transferring as much to the body of the car.

Barrier Material

  • Closed-Cell Foam: Apply closed-cell foam sheets to the trunk’s surface. This foam acts as a barrier against sound transmission and absorbs vibrations.
  • Foam Spray: Expandable foam spray can be used to fill in gaps and crevices in the trunk’s structure. This helps prevent sound leakage.

Damping Pads

  • Vibration Damping Pads: These are adhesive-backed pads designed to reduce vibrations and resonance. Apply them to metal surfaces in the trunk, such as the inside of the trunk lid. Seal Gaps and Joints:
  • Weatherstripping: Use self-adhesive weatherstripping to seal any remaining gaps around the trunk lid, hinges, and other openings.
    Test and Adjust:

After applying the soundproofing materials, close the trunk and test for noise reduction by playing music from inside the car or tapping on the trunk’s exterior. If needed, you can add additional layers of material to areas that still transmit sound.

Read also: How To Soundproof Baby Room Apartment

Does sound deadening trunk work?

Yes, sound deadening for your trunk does work effectively. By applying specialized materials like mass-loaded vinyl, closed-cell foam, and damping pads to your trunk’s interior surfaces, you can significantly reduce both the noise entering the trunk from outside and the noise escaping from inside.

These materials absorb vibrations caused by sound waves, preventing them from resonating and traveling through the metal surfaces. Additionally, sound-absorbing materials like acoustic foam further dampen sound waves and minimize echoes.

While complete sound elimination might not be achievable, sound deadening can noticeably enhance your driving experience by reducing road noise, vibrations, and the transmission of unwanted sounds. Proper installation and coverage of key areas like the trunk lid, sides, and floor are essential for optimal results.

Where do you put sound deadening in a trunk?

When soundproofing or sound deadening a trunk, you should focus on key areas to effectively reduce noise transmission. Here’s where you should consider placing sound-deadening materials:

  • Trunk Lid: Apply sound-deadening material to the inside surface of the trunk lid. This is a crucial area, as vibrations and noise can easily pass through the metal lid. Cover the entire inner surface to dampen vibrations and block external noise.
  • Trunk Floor: Place sound-deadening material on the trunk floor, especially in the spare tire if applicable. This helps prevent road noise and vibrations from entering the trunk space.
  • Trunk Sides: Apply sound deadening to the sides of the trunk, including wheel wells and rear panels. These areas can resonate with sound and vibrations, so covering them helps to reduce noise.
  • Trunk Ceiling: If possible, add sound deadening to the trunk ceiling. This step further minimizes sound transmission and helps create a more complete soundproofing effect.
  • Areas Around Speakers and Components: If your trunk contains speakers or other components that generate vibrations, apply sound deadening around them. This prevents these vibrations from resonating and transferring to the rest of the trunk.
  • Seams and Gaps: Pay attention to seams, gaps, and junctions where different parts of the trunk meet. Apply sound-deadening material to seal these areas and prevent sound leakage.

Reasons for a Noisy Car Trunk

Car Trunk
Soundproof Car Trunk

A noisy car trunk can be attributed to various factors that contribute to unwanted sounds and vibrations. Here are some common reasons for a noisy car trunk:

  • Road Noise: The trunk is susceptible to road noise, which includes tire noise, engine vibrations, and wind turbulence. These external factors can transmit noise through the trunk’s metal surfaces.
  • Poor Insulation: Insufficient or low-quality insulation in the trunk area can allow external noise to penetrate the interior. Inadequate insulation also fails to dampen vibrations effectively.
  • Lack of Soundproofing: Without proper soundproofing materials, sound waves easily bounce off the metal surfaces of the trunk, creating echoes and amplifying noise.
  • Vibrations: Components in the trunk, such as the spare tire, tools, or loose items, can cause vibrations during driving. These vibrations generate noise as they resonate through the trunk’s structure.
  • Loose Parts: Loose or unsecured parts within the trunk can rattle against each other or the trunk walls, producing annoying sounds.
  • Worn Suspension or Bushings: If the vehicle’s suspension system or bushings are worn or damaged, they can transmit more vibrations and road impacts into the trunk area.
  • Exhaust System Issues: A malfunctioning or damaged exhaust system can lead to increased exhaust noise and vibrations, which can resonate through the trunk.
  • Subwoofer or Audio Equipment: Aftermarket subwoofers or audio equipment that are not properly installed or isolated can cause vibrations and excessive bass, resulting in unwanted noise.
  • Sealing Issues: Gaps or openings in the trunk’s seals, weatherstripping, or hinges can allow noise to escape or enter the trunk.
  • Road Conditions: Poor road conditions, such as uneven surfaces or potholes, can cause vibrations and impacts that transmit noise to the trunk.
  • Inadequate Trunk Hardware: Weak or worn trunk hardware, like hinges and latches, can cause rattling and increased noise when the trunk is in use.

Benefits of Soundproofing Car Trunk

Soundproofing your car trunk offers several benefits that contribute to a more comfortable and enjoyable driving experience. Here are the key advantages of soundproofing your car trunk:

  • Reduced Noise: The primary benefit of soundproofing is a significant reduction in noise entering the trunk space. This includes external noises like road traffic, engine vibrations, and wind turbulence. A quieter trunk enhances overall cabin comfort.
  • Enhanced Audio Quality: By reducing external noise, soundproofing allows you to enjoy your vehicle’s audio system at lower volumes while maintaining clear and crisp sound quality. This is particularly important for listening to music or podcasts during your drive.
  • Minimized Vibrations: Soundproofing materials absorb vibrations that can originate from road irregularities or components within the trunk. This not only reduces noise but also contributes to a smoother and more comfortable ride.
  • Less Fatigue: Constant exposure to loud or distracting noises can lead to driver fatigue. Soundproofing reduces mental strain by creating a quieter and more relaxed driving environment.
  • Improved Conversations: Lower noise levels make it easier for passengers to communicate within the vehicle. Whether you’re talking to passengers in the back seat or using hands-free calling, reduced noise improves communication.
  • Protection of Valuables: If you frequently transport valuable or delicate items in your trunk, soundproofing can provide an added layer of protection by minimizing vibrations and impacts that could potentially damage these items.
  • Resale Value: A well-maintained and comfortable vehicle interior can positively impact its resale value. Soundproofing contributes to the overall quality and appeal of the car.
  • Customization: Soundproofing allows for customization of the driving experience. You can tailor the level of soundproofing to your preferences, balancing noise reduction with other factors.
  • Vehicle Insulation: Soundproofing materials can also provide thermal insulation, helping to regulate the temperature inside the trunk. This can be especially useful in extreme weather conditions.
  • Overall Driving Pleasure: A quieter and more serene driving environment enhances the pleasure of being on the road, making your daily commute or long trips more enjoyable.

Car Trunk Soundproofing Materials

When soundproofing your car trunk, using the right materials is essential to effectively reducing noise and vibrations. Here are some common car trunk soundproofing materials that you can consider:

  • Mass-loaded vinyl (MLV): MLV is a dense, flexible material that adds mass to surfaces, reducing sound transmission. It’s often used to cover large areas like the trunk floor, walls, and ceiling.
  • Acoustic Foam: Acoustic foam panels are designed to absorb sound waves and reduce echoes. They can be applied to the trunk’s interior walls to dampen noise and create a more acoustically controlled environment.
  • Damping Mats and Pads: Damping mats are adhesive-backed sheets that convert vibrations into heat, reducing resonance and noise. They can be applied to metal surfaces to absorb vibrations and prevent them from transmitting sound.
  • Closed-Cell Foam: Closed-cell foam has both sound-absorbing and sound-blocking properties. It’s versatile and can be applied to various areas of the trunk to reduce noise and vibrations.
  • Foam Spray: Expanding foam spray is used to fill gaps and voids in the trunk’s structure, preventing sound leakage and improving overall soundproofing.
  • Butyl Rubber Sheets: Butyl rubber sheets are highly effective at dampening vibrations and reducing noise. They are often used in combination with other materials for optimal results.
  • Rubber Grommets and Shock Mounts: If you have components like speakers or subwoofers in the trunk, using rubber grommets or shock mounts isolates them from the trunk’s metal, minimizing vibrations.
  • Weatherstripping: Self-adhesive weatherstripping can seal gaps and joints, preventing noise from entering or escaping through openings in the trunk’s structure.
  • Carpet or Trunk Liner: Automotive carpet or trunk liner adds both insulation and sound absorption. It can be applied to the trunk floor and walls for enhanced noise reduction.
  • Resilient Underlayment: Resilient underlayment, usually made from materials like cork or foam, can be placed under carpeting to further dampen vibrations and reduce noise.

What Causes Noise in the Car Trunk?

Noise in a car trunk can stem from various sources, both internal and external. Understanding these causes can help you identify and address the specific issues contributing to the noise. Here are some common factors that cause noise in the car trunk:

  • Road Noise: External factors like tire noise, engine vibrations, wind turbulence, and road irregularities transmit through the vehicle’s structure and into the trunk area.
  • Poor Insulation: Inadequate insulation in the trunk allows external noises to easily penetrate the interior. Lack of proper insulation also fails to dampen vibrations effectively.
  • Vibrations: Vibrations from the road, components within the trunk, or the vehicle’s suspension system can resonate through the trunk’s metal surfaces, creating noise.
  • Loose Items: Unsecured items within the trunk can rattle against each other or the trunk walls when the vehicle is in motion, resulting in distracting noise.
  • Exhaust System Issues: A malfunctioning or damaged exhaust system can cause increased exhaust noise and vibrations, which can resonate through the trunk.
  • Audio Equipment: Subwoofers or aftermarket audio equipment that’s not properly secured or isolated can produce vibrations and excessive bass, leading to unwanted noise.
  • Worn Suspension or Bushings: A worn or damaged suspension system or bushings can transmit more vibrations and road impacts into the trunk space.
  • Sealing Gaps: Gaps, seams, and openings around the trunk’s seals, weatherstripping, or hinges can allow noise to escape or enter the trunk.
  • Trunk Hardware Issues: Weak or worn trunk hardware like hinges and latches can lead to rattling and increased noise during vehicle movement.
  • Inadequate Soundproofing: Insufficient or poorly installed soundproofing materials can fail to effectively dampen noise and vibrations.
  • Structural Resonance: Certain frequencies can cause the trunk’s metal surfaces to resonate, amplifying noise. This is more likely when the trunk is empty.
  • Poorly Balanced Load: Unevenly distributed weight in the trunk can lead to more vibrations and noise from the rear of the vehicle.


In conclusion, soundproofing your car trunk can significantly improve your driving experience by reducing external noise, vibrations, and unwanted sounds. By employing a combination of powerful materials and techniques, you could remodel your trunk into a quieter and more cozy space.

Mass Loaded Vinyl (MLV), acoustic foam, damping mats, closed-mobile foam, and rubber grommets are some of the soundproofing substances that can be strategically applied to key regions just like the trunk lid, sides, floor, and round additives.

Do not forget, a hit soundproofing calls for thorough insurance and the right installation to gain the most effective consequences. Addressing sources of noise together with street vibrations, free objects, and exhaust machine problems will complement your soundproofing efforts.

With a quieter and more serene car trunk, you may enjoy clearer audio satisfaction, advanced communique, decreased fatigue, and typically more suitable driving surroundings. Whether or not you are seeking to create a higher audio experience or sincerely need a nonviolent journey, soundproofing your automobile trunk is a worthwhile endeavor that brings comfort and enjoyment to every experience.


1. Why should I consider soundproofing my car trunk?

Soundproofing your car trunk can significantly reduce external noise such as road traffic, wind turbulence, and engine vibrations, creating a more comfortable and enjoyable driving experience. It also enhances audio quality, minimizes vibrations, and prevents unwanted sounds from entering or escaping the trunk.

2. What materials are best for soundproofing a car trunk?

Effective soundproofing materials for a car trunk include Mass Loaded Vinyl (MLV), acoustic foam, damping mats, closed-cell foam, and rubber grommets. These materials absorb vibrations, dampen sound waves, and block noise transmission. Combining these materials strategically on the trunk lid, sides, floor, and around components can yield optimal results.

3. Can I soundproof my car trunk on my own, or do I need professional help?

Soundproofing a car trunk is possible as a DIY project, especially with readily available soundproofing kits and materials. However, it requires careful installation and attention to detail to ensure proper coverage and effectiveness. If you’re not confident in your DIY skills, or if you’re looking for a more thorough and precise solution, seeking professional help from an automotive soundproofing specialist might be a good option.

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