Having spent a lot of time sound proofing the back of the van earlier on in the project my attention turned to the cab area. I used by iphone to identify areas of high noise (db meter app) and decided that a good start would be the dashboard.
The general guidance with any sound insulation is that the first step is to block sound and the second step is to absorb the sound. With this in mind I diassembled the dashboard as much as I could by taking off all of the access panels and by removing the glove box. Having done this I then added flash band tape to the plat surfaces to reduce resonance and provide some absorption for the high frequency noise.
While the panels were removed I used some synthetic fibre wool to fill the voids behind the dashboard to provide some sound absorption.
After replacing the glovebox I lined the inside of it with flashband tape.
This item is the tray from the top of the dash, as you can see I added flashband tape to lower its resonant frequency and to provide some damping.
I stuffed this cavity full of wool, taking care not to interfere with the electrical harnesses and steering system.
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