Owners Skoda Octavia A7 Often face the problem of increased noise when driving, especially on the road. The sound from the rotation of the wheels, the hum of arches and the whistle of the wind penetrate into the cabin through the looseness of the body, making travel tedious. The trunk in this model is one of the main ways of penetration of external stimuli, since it is directly connected with the rear wings and the bottom.
Done correctly vibration isolation and sound insulation They can radically change the perception of the car. You will notice not only a decrease in the overall noise level, but also an improvement in the acoustic climate, which is especially important if you appreciate the sound quality of a regular audio system or install additional speakers.
The process requires care, as the design of the luggage compartment Octavia A7 It has its own features: a complex shape of the arch, the presence of technological holes and the specific geometry of the shelf. Errors in installation can lead to new creaks or corrosion under the layers of material.
Why the back arch and the trunk shelf?
In body structure Skoda Octavia A7 The trunk plays the role of a resonator. Sound waves from arches and road surfaces are reflected from metal surfaces and amplified inside the cavity. If you do not process, you will hear a monotonous hum, which increases with increasing speed. The main source of the problem is the thin metal of the wing and the lack of a sufficient layer of damping materials.
Particular attention should be paid post-archIt is through them that the main flow of air and noise from tires passes. In this zone, metal is most susceptible to vibration. Also critical is the handling of the trunk shelf, which often works as a membrane, transmitting vibrations to the ceiling and rear seats.
Ignoring these areas makes it meaningless to treat the doors or floor of the cabin. The effect will be partial and temporary. To achieve maximum results, it is necessary to work comprehensively, covering all metal surfaces in contact with the external environment.
Materials selection: what is best for Octavia A7?
The market offers a wide range of materials, but for Octavia A7 Not everyone fits. You will need materials with a high damping factor for vibration insulation and excellent sound-absorbing properties for the finish layer. Standard solutions are often too subtle for this task.
For vibration insulation, it is best to use bitumen-mastic with aluminum foil thickness from 2.5 to 3 mm. They effectively extinguish the low-frequency vibrations of the metal. For arches and complex curves, more elastic compositions that do not crack at temperature changes are suitable. Do not skimp on the adhesive layer - it must be of high quality so that the material does not fall off during operation.
Use it as sound insulation. splen or materials based on foamed polyethylene with foil coating. They reflect heat well and absorb high-frequency noise. For acoustic comfort inside the trunk, you can add a layer satin Or felt that will remove the resonance from the shelf.
It is important to consider the weight of the materials. Excessive weighting of the trunk can affect the weighting of the car and wear of the rear suspension. The best solution is to use a thin but effective combined materials Like "Vibroplast" or analogues.
⚠️ Attention! Do not use materials with an aggressive adhesive composition, which can damage the factory anti-corrosion treatment of the body. Before applying, be sure to check the compatibility of the glue with the surface.
Step-by-step installation instructions
Before the start of work, the car must be prepared. Remove all elements of the trunk skin: side panels, shelf, carpet and wheel. Carefully clean the metal from dust, dirt and remnants of old glue. Degrease the surfaces with alcohol or a special degreasing agent to ensure perfect adhesion.
Start with vibration insulation. Apply the material to the arches and bottom of the trunk, rolling it tightly with a roller. Pay special attention to the technological holes – they must be completely sealed, as they are the main conductors of noise. For complex curves, use a building hair dryer to make the material fall flat without folds.
The next step is to install soundproofing. Plug the sheets together, avoiding crossovers that can cause creaks. For the trunk shelf, use a material with a soft layer that will extinguish vibrations from the cargo. Be sure to treat the inside of the trunk lid if you want to achieve silence when closing the door.
After completion of the work, allow the materials to "lie down" during the day before assembly. This will allow the glue to be fully polymerized and ensure the reliability of the attachment. When assembling the skin, make sure that the fixers fall into place, otherwise there will be extraneous sounds from the friction of plastic.
☑️ Preparing for soundproofing
⚠️ Attention! When working with aerosol materials or glue, be sure to use a respirator and work in a ventilated room. Solvent vapors can be toxic.
What to do with technological holes?
Technological holes in the bottom and arches are often closed with factory plugs. If they are absent, they must be sealed with vibro-insulating material on both sides or use special plastic plugs pre-treated with a sealant. This is critical to eliminating the hum of the arches.
The assembly is done in reverse order. Make sure that all wires and sensors are not sandwiched between layers of materials. Check the operation of locks and mechanisms of opening the trunk before finally fixing all the elements of the skin. Errors at this stage may lead to the need for re-examination.
- I'll do it myself
- I'll give it to the service
- Not yet.
- Already done
Comparison of materials and their effectiveness
To choose the best solution, it is worth considering the characteristics of popular materials. Different brands offer products with different thickness, weight and damping ratios. Comparison will help you understand what is right for your budget and requirements.
Below is a table comparing the main types of materials used in noise insulation. Skoda Octavia A7:
| Material type | Thickness (mm) | Weight (kg/m²) | Efficiency | Cost |
|---|---|---|---|---|
| Vibroplast Gold | 2,3 | 4,0 | High | Average |
| STP Aero | 3,0 | 2,0 | Average | Low |
| Spleen 8mm | 8,0 | 0,9 | High (warmth) | Low |
| Accent 10mm. | 10,0 | 1,2 | Very high | High |
The choice depends on your goals. If you just need to lower the hum, a basic set is enough. To create acoustic comfort in the trunk, a more expensive solution with a multi-layer structure will be required. Remember that a combination of materials gives a better result than using one type.
The combination of vibration insulation and sound absorber gives the maximum effect, reducing noise by 30-40% compared to the factory state.
Common mistakes and how to avoid them
Many beginners make the same mistakes that negate all efforts. The most common problem is insufficient rolling of vibration insulation. If the material does not fit tightly to the metal, it will work like a drum, amplifying vibrations instead of quenching them.
Another mistake is ignoring the processing of plastic elements. Plastic can creak against metal or against each other, if you do not lay between them a damper layer. Use it. vibroplast or special tapes for insulation of fasteners and latches. This is especially true for the side panels of the trunk.
Incorrect calculation of the thickness of materials can also be a problem. If the layer is too thick, the skin may not stand in place, and the retainers will be broken. Always check the dimensions before final stowage. For Octavia A7 It is important to maintain a balance between efficiency and the amount of luggage space.
⚠️ Attention! Do not use materials containing bitumen in areas with high temperatures without additional protection. In summer, it can be hot in the trunk, and bitumen can begin to melt and emit an unpleasant odor.
Also, avoid layering on top of each other in places where there are complex curves or where the skin will be attached. This will create bumps and lead to deformation of the plastic. Cut the material gently, fitting it to the place, not on the table.
Results and impact on acoustics
After the work is completed, you will notice a significant decrease in noise levels. The sound from the tires will become more deaf and quiet, the hum, which used to interfere with conversation in the cabin, will disappear. The acoustic properties of the trunk will change: it will cease to resonate, which will positively affect the sound of the subwoofer, if it is installed.
Many owners note that after the sound insulation of the trunk Octavia A7 It is quieter even when driving around the city. This is because noise from the arches no longer penetrates the cabin through the floor and back doors. The effect is enhanced if other areas of the car have been treated.
In addition, noise insulation improves the thermal insulation of the trunk. In winter, heat is stored longer inside, and in summer less heats up from the hot asphalt. This can be useful if you are carrying groceries or using a trunk to store things sensitive to temperature.
Before installing a subwoofer or other audio equipment, be sure to conduct a full vibration insulation of the shelf and the walls of the trunk to avoid rattling the speaker body.
FAQ: Frequently asked questions
How long does it take to make the trunk noise insulation?
On average, the work takes from 4 to 8 hours, depending on the qualifications of the master and the amount of preparatory work. Self-employment may take longer due to lack of experience and a special tool.
Do I need to remove the wheel to handle the arch?
Yes, for high-quality processing of the rear arch, it is necessary to remove the wheel and partially dismantle the underwings. This will allow you to reach hard-to-reach areas and ensure reliable gluing of materials.
Does sound insulation affect the load capacity of a car?
Yes, weight is added (usually 10-15 kg), but this has little effect on dynamics and fuel consumption. However, it should be borne in mind that the load on the rear suspension increases slightly.
Is it possible to do sound insulation in the cold season?
It is desirable to carry out work in a warm room at a temperature not lower than +20 ° C. Cold materials become brittle and poorly adhered, and the glue takes time to polymerize.
What to do if there is a smell after work?
It is possible that materials of poor quality were used or that no thorough cleaning was carried out. Ventilate the trunk for a few days. If the smell has not disappeared, you may need to replace the material with a better one.