How to Soundproof a Peterbilt Cab

Start by removing interior trim panels, flooring, door cards, and any factory insulation inside the cab. The goal is to expose as much bare metal as possible across the floor, firewall, walls, roof, and doors.

After the cab is stripped, thoroughly clean every surface where materials will be installed. Use a degreaser or alcohol solution to remove dust, oil, and residue. Proper surface preparation ensures strong adhesion and long-term durability for all soundproofing layers.

The first layer of treatment is vibration control. Apply Damplifier Pro to the metal panels across the cab at 60% coverage or more.

Install the material directly onto the cabin-side firewall, the cab floor, the walls, the roof, and inside the doors. Press the sheets firmly onto the metal using a roller to eliminate air gaps and maximize adhesion.

This layer works by reducing panel vibration, which is one of the largest sources of noise inside truck cabins. If you want to learn more about this process, the guide on how to soundproof a semi truck explains the full treatment strategy used in commercial rigs.

Damplifier Pro forms the foundation of the soundproofing system and prepares the cab for additional blocking and absorption layers.

After the vibration control layer is installed, the next step is blocking airborne noise coming from the engine and road, and for that, you need mass loaded vinyl that will stop airborne noise in a vehicle. Install Luxury Liner Pro across the cab floor at 100% coverage. Carefully cut sections to fit around seat mounts, wiring, and structural contours.

Seal the seams using vinyl tape or high-temperature foil tape to maintain a continuous noise barrier. Luxury Liner Pro uses a dense barrier layer designed to block airborne sound.

With vibration controlled and the floor soundproofed, the next step is absorbing sound reflections inside the cab.

Install Mega Zorbe Hydrophobic Foam on interior panels such as the doors, the roof liner area, and the rear cab walls. Cut the foam to fit within the cavities behind interior trim panels and install it over the sound deadening layer.

This acoustic insulation absorbs airborne sound waves that would otherwise bounce around inside the cabin. In addition to improving overall sound quality inside the cab, it also helps reduce echo and high-frequency noise.

For additional treatment ideas, the guide on an effective way to soundproof truck doors shows detailed examples of treating door panels for maximum noise reduction.

Engine noise is one of the most significant noise sources in any semi truck. Addressing the engine compartment dramatically reduces mechanical noise entering the cab and complements the soundproofing installed inside the cabin. Treating the firewall and hood is the best way to go about this.

Apply vibration control and insulation materials to the firewall and the underside of the hood whenever possible. The best pair is Damplifier Pro and Mega Block for engine-facing installs. Treating the hood structure is similar to the process described in this guide on how to sound deaden a freightliner hood.

Many drivers share their builds and installation projects in the Second Skin Customer Projects gallery, including numerous examples inside the Semi Truck Soundproofing Projects section.