What is the problem?
In vehicles with deep dashboards, engine noise can be quite public. The dashboard insulates very little, especially in motorhomes such as the Hymer. The lack of mass in the dashboard causes a sound leak into the vehicle as well. There are dashboards with many hollow spaces and dashboards made of steel in old-timers allow a lot of driving and engine passages.
What is the solution?
Not every dashboard is suitable for a solution, but if there is access to the dashboard, you can fill empty cavities here with a wool material such as Akotherm. This reduces the sound that comes from the motor and the heater.
You can fit a dashboard in motorhomes, especially in the Hymer, with Isomat TS8 then place the upholstery again. The underside of the dashboard, accessible through the hood, provides you with an absorption material such as Acusticab or Merfocell GW (the thicker, the better).
Which products do I use and where?
Isomat TS8 : On the dashboard on the cabin side
Acusticab or Merfocell GW : Against the underside of the dashboard to absorb engine noise.
STP Black Silver: For anti-drumming steel dashboards.
Below you will find all the products described for insulating the dashboard:
Starting at £57.96
House 
Vehicles 
Improving Acoustics 
Industrial Noise Control 
Boats & Yachts 
Studio & Hi-Fi 
Architectural Sound Insulation 
Sound Absorption 
Sound Insulation 
Vibration Isolation 
Silent Ventilation 
Accessories 
Thermal & Acoustic Insulation