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BUILDING A VAN? WE'VE BEEN THERE. PRODUCT RECOMMENDS

How To Soundproof Your Campervan Conversion

Work vehicles are notoriously noisy. They are not designed for luxury, and cruising around with large panels of sheet metal is a recipe for vibration and acoustic amplification. Depending on your sensitivity, a noisy vehicle can be wearing when you’re driving and unnerving at night when you hear footsteps two blocks away. The simple an cheap solution is to use earplugs. But if you’re doing a full van buildout, then it’s worth at least looking into noise reduction options.

Thanks to audiophiles around the world, there is no shortage of techniques and opinions on how to reduce the sound coming from the outside world. When planning, keep in mind that you’re not trying to create a sound studio. The more layers and complexity to your setup the more weight you’re adding and the more you have to deal with if you, say, have to troubleshoot a water leak. With that caveat, let’s dive in!

Vibration and Resonance

Usually the biggest noise contributor in a van is is large, thin sheets of metal that reverberate. If you take an empty sprinter and hit the wall with a stick, it’s going to amplify that sound as the panels vibrate, similar to a gong. This effect can even happen just with sound waves hitting the walls. Outside noise hits the panels and because they can vibrate – sound is transferred right through.

Now, if you were to put your hand on that wall and hit it, the sound would not be as loud or last as long. Effectively, you want to deaden these walls without having to put your hand on the walls while driving around. This is where sound deadening come in.

Sound Deadening In A Campervan

Fatmat Rattletrap and Noico are popular peel and stick products that can be applied to your vehicle to dampen the noise. The key is in the high viscoelasticity of the material. Basically, this means that if you were to stretch them it would take the material a long time to return to its original shape. This slow deformation means that when sound wave hits one side of the material, it can’t travel to the other side of the material. This is a potent effect, and it doesn’t take much deadening material (as little as 25% of a large surface) to really reduce vibration traveling through your van walls.

Peel and stick sound deadeners address a large portion of the noise and are easy to install at a reasonable price. This is the route that most people take if they choose to add a sound dampener.

If you want to try and tackle every noise source, you’re looking at thousands of dollars and a week of work. If that doesn’t scare you off, we recommend the sounddeadenershowdown.com site for a proper dive into fully soundproofing your campervan.

Soundproofing With Cheaper Alternatives

You may come across folks using cheaper alternatives to the automobile specific materials like Fatmat and Noico. Peel-and-seal rolls that you can buy at Home Depot are popular because they look quite similar to Fatmat at 1/2 the price. And that’s because generally they are the same materials: aluminum and rubberized asphalt. Unfortunately, these materials are made for roofing, and aren’t made with the same requirements in mind. The mixture of butyl and carbon in the asphalt isn’t designed with high viscoelasticity, so while in theory they can work well, there’s no guarantee of how well they will deaden sound.

In addition, these material have been reported to melt in the heat – so much that some people have had the material detach from their ceiling and bring down the headliner in their car. Not to mention the black carbon leaking out of their trunk.

In our opinion, this is one of those things where its best to use purpose-designed products or just skip sound deadener altogether. It’s not worth the potential issues of using roof sealer as a deadener to try to save a few bucks.

How Much Sound Deadening Material Do You Need?

You don’t need 100% coverage for sound dampening products to work. With proper deadeners, you can use as little as 25% to reduce the vibrations as long as the materials is cut up in sections and spread out evenly to cover the majority of the walls.

Where To Apply:
 Walls  Doors
 Floor  Wheel Wells
 Ceiling  Underneath Hood
 Cab

50 square feet of sound dampening material should give you enough supply to do basic coverage of the large areas of a Sprinter van. To get 100% coverage on the largest vehicles, you can expect to use up to 125 square feet of material.

Materials For Installation

  • 50 – 125 SQFT. Sound deadener
  • Scissors
  • Measuring tape
  • Mini roller
  • Hairdryer (optional)

How To Install Sound Deadener

Sound deadener is relatively easy to install. If you’re going to to it, this should be one of the first steps of your build. Sound dampening materials will be attached directly to the metal of your vehicle. It goes underneath any insulation or moisture barriers that may be applied afterward. Keep in mind, you don’t need to cover the whole surface to be effective.

1. Clean your vehicle

The first step is to clean the surface you intend to apply the sound deadener. Remove any body panels, dirt or grease. Make sure to completely dry off the area before installation. Moisture can inhibit the sticky material from bonding. The last thing you want is for your sound deadener to start falling off because then it won’t work!

2. Measure out your surface area and cut

If you’re aiming for full coverage, take accurate measurements of each section of your vehicle. A cardboard template can be really helpful here. Use a sharpie marker and draw out your cut lines. Sound deadener can be easily cut to size with a pair of scissors or a box cutter.

When it comes to oddly shaped surfaces like a wheel well or cab floor, cutting strips of 5-6 inch sections is a good way to piece everything together.

3. Peel and stick

Applying the sound dampener is as simple as peeling off the adhesive backing and sticking it to the metal surface. Try not to touch the sticky side with your hands for the best results.

4. Wheel Wells

While partial coverage is effective on the walls and ceiling, you may consider fully covering the wheel wells. A huge amount of tire, road, and exhaust noise comes in through this spot. By covering the wheel wells you’re not only reducing vibration, but also trying to completely block the noise with the mass of the material. Deadeners aren’t really designed for this, but they do help a little bit so it doesn’t hurt unless you plan on doing it properly with a heavy material.

Pro-tip: heating up the material will make it more malleable for curved surfaces.

5. Use a roller to make sure the panels are flat

The last step is important. Deadeners need to be firmly applied to work correctly. It is highly recommended that you use a roller press, bottle or equivalent during the installation process. Pressing with your fingers is unsafe because the edges of the foil are sharp!

Noico material comes in pre-cut strips and has an embossed foil which indicates when it is installed correctly. In this case, you can visually see that each section of the sound dampener is laid flat. Fatmat Rattletrap comes with a roller included for installation.

Soundproofing For Comfort

Soundproofing your campervan is not necessary, but for less than $150 you can greatly improve the comfort of your vehicle. Sound deadening material will reduce road noise and sounds coming from the outside world as you’re trying to sleep. If you have the funds, there really isn’t a downside to planning this step.

This article covers the basics and what we feel is the cost effective technique for most van builds. If you want to get into some more advanced theory and have time do dive down an audio rabbit hole, head over to sounddeadenershowdown.com and the forums at diymobileaudio.com.

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