Soundproofing Audi S5 in Sydney

On the degreased metal roof of the Audi , we apply the first layer — STP Aero vibration damping material, 2 mm thick.
Despite its low thickness and light weight, this material effectively absorbs vibrations of the thin roof metal. And there are plenty of vibrations here, as the Audi roof has no cross reinforcements across its entire surface.

After firmly rolling the first layer with rigid metal rollers, we move on to applying the second layer on the Audi A5 roof.
This is a sound-absorbing and thermal insulation material — Biplast 15 mm thick. We install it with the textured side facing down, as its purpose is to absorb sound waves traveling through the cabin.
As noise passes through the thin factory headliner, it gets “trapped” in the Biplast, preventing it from reflecting off the metal roof and returning back into the cabin.

Soundproofing the vehicle floor is primarily done to reduce noise from the wheels and suspension, as well as the road roar that can be especially noticeable on rough asphalt.
This process is highly effective, but the result напрямую depends on selecting the right materials and installing them correctly.
Before applying the materials, we carry out a full disassembly of the lower interior, including removal of the centre console, all seats, and the factory floor carpeting.

The floor structure is quite similar across most Audi models, from the A4 to the A7. Despite having structural reinforcements and a significant amount of factory vibration damping, the metal still resonates when tapped, meaning additional damping is beneficial.
Factory vibration damping in Audi vehicles is usually well bonded to the metal, without cracks or air gaps, so removal is typically unnecessary.

In this case, however, the rear wheel arches were an exception — the factory material was poorly adhered, so we removed it.
We applied STP Aero vibration damping to the floor, which perfectly conforms to the complex surface while effectively reducing vibrations of the thin metal.
For the rear wheel arches, we used STP Profi+ vibration damping, 3.5 mm thick, to achieve maximum effectiveness in high-load areas.

Soundproofing the car doors not only reduces noise levels inside the cabin but also improves the sound quality of the audio system — even the factory one.
The doors of the Audi have a very convenient design, as there is a plastic cover behind the door trim that seals an access opening. It is through this opening that we gain access to the inside of the door to apply our materials.

The first layer on the outer door metal is STP Aero vibration damping. Lightweight, flexible, yet highly effective on thin door panels, this material—once properly rolled—eliminates unwanted vibrations from the outer metal.
The second layer is STP Accent Premium sound absorber, 6 mm thick

After completing the work inside the door, we move on to the Audi door trim.

We cover the entire surface with STP Biplast 10 mm thick, a sound-absorbing material with a textured face. It securely holds all wiring and linkages behind the trim, eliminating rattles and squeaks, while also acting as an additional barrier against external noise.

The bonnet is treated in two layers to reduce engine noise inside the cabin.

First layer: STP Aero vibration damping applied to the outer metal