How to Quiet Your Cab: Best Noise Reduction Tips

Excess road noise entering your cab space ruins your quality of life on the road. Thankfully, it's an easy fix.

While some big rig cab structures are manufactured using fiberglass, a material which does a decent job at absorbing ambient noise, most are made from aluminum which is highly acoustic. 

There are only two ways to solve this: add insulation lining and plush carpet flooring. 

The Cab Noise Problem in Semi Trucks

The old-school Class 8 trucks were a notorious combination of a noise-making machine and a hot box. 

Drivers would often find the back of the sleeper cab, where the semi-truck wheels sat right underneath, to be especially loud. 

Today, Next-Gen truck models, like the Peterbilt 589, integrate features like triple-sealed cab construction to automatically block out a large amount of noise. 

However, owner-operators can always use some noise-cancelling accessories, whether they own a classic truck or a Next-Gen model. 

Best Areas to Quiet the Semi Truck Cab Space

To dampen excess noise, you should apply noise-dampening lining/inserts to the following areas:  

• Floor
• Doors
• Truck Bed
• Ceiling
• Back Wall (Behind the Seats)

Option #1: Apply Noise Dampening Insulation Sheets

One of the best ways to quiet an older truck model (not a Next Gen truck), is to strip out the interior, line it with noise dampening foil material, secure it, then re-install all of the interior again.

Viola.

It's not easy, but it'll kill most of the noise. 

Not only that, it also acts as a thermal barrier for your cab, insulating the entire area for brutally cold winters and swealtering hot summers 

Try the HushMat Foam Inserts

Add some noise dampening closed-cell foam (or fiber decoupler) insert panels to your ceiling and flooring to block out excess noise and vibration from the road. 

Admittedly...just like the first option, you'll have to remove the interior flooring, seats, panels ,and coverings to finish the installation. That's the time-consuming part. Actually applying the HushMat insulation lining is the easier part. 

Best Features of HushMat

• Self-adhesive peel and install with no-tools for an easy process
• Applies to floor pan, roof side wall firewall and doors
• Insulation for sound and heat
• Weatherproof sealant against corrosion on the underbody (seat anchors and floor pan)

While you're big rig is stripped bare and you're applying the insulation, it's a great time to start adding more interior customizations.

While Insulating the Cab, Customize It

Consider a custom headliner insert or interior dome lighting, if you're so inclined. 

OTR Bandit: Customizing the Cab Interior with a Headliner & Watermelon Lights

Option #2: Add a Thermoplastic Mat or Plush Sleeper Carpet Set

While this isn't a 100-percent fix to noise problems in a cab, it does a lot of heavy lifting. Plush sleeper-cab carpet sets in conjunction with full-floor-coverage liners really do help stop excess noise coming through the firewall and undercarriage of the truck.

Semi truck carpet sets are lined to the make/model configuration of your truck and can serve as an extra layer of noise defense. 

Floor liners and dense thermoplastic floor mats act as a secondary line of defense against noise pollution in your cab space. 

There's also a comfort factor to consider here.  

Additional Noise-Cancelling Tips

Muffle the Engine Noise & Exhaust Sound 

Start by inspecting the rig for any mechanical noise leaks, like a leaking exhaust clamp, loose bracket, or damaged shifter boot. 

Best order of operation when dampening noise: 

• Fix leaks, loose brackets, mounts, and seals first.
• Treat the firewall and cab floor.
• Treat the sleeper floor and under-bunk area.
• Treat doors and weatherstripping.
• Treat wheel-well-adjacent interior panels.
• Treat roof/rear wall last.

Deaden the Wheel Wells

It's not common, but you can deadend the wheel wells with road-grade rubberized coating. You could also replace damaged, noise-generating components like splash shields inner fender liners, hood seals, or floor plugs.

The more tactical approach is to focus inside of the cab, as this is where noise from the engine bay and wheels reverberates in. 

Weather Strip Seals on Cab Doors & Windows

Swap out the rubber weather strip seals only if they’re damaged or busted. This will only dampen the noise marginally. Honestly, the heavy lifting is done by the lining and floor carpet.

You can also replace torn door seals or add anti-rattle adhesive tape or foam around the trim clips, speaker mounts, and handle rods.

The goal is to eliminate wind noise, road hiss, and panel vibrations from entering the cab. 

Cover & Dampen Noise from Metal on Metal Contact in the Sleeper

Technically, any area of the sleeper cab that has loose metal on metal contact will vibrate as you drive. So, adding a sound-deadening material to cover these areas can help.

Shop Semi Truck Interior Cab Accessories at 4 State Trucks 

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