Following on from Part 2, the next step was to install some acoustic insulation.
I applied proprietary butyl rubber sound-deadening panels of 2.5 mm thickness, although self-adhesive butyl roofing tape is basically the same thing and might work out much cheaper if you're on a strict budget.
The van body panels were locally cleaned using methylated spirits, and the acoustic insulation was cut to basic shapes as required and then simply pressed onto the painted surfaces, using a cloth and a small paint roller to smooth them out and ensure a good contact.
These butyl sheets are quite heavy and add mass to the thin body panels to act as vibration dampers. Each insulation piece is fitted in the centre of every 'sub-panel', as are naturally formed between panel stiffeners and / or folds & creases in the metal. You don't need anywhere near 100% coverage to kill noise due to panel resonance - even a relatively small piece in the correct location will be effective.
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acoustic insulation panels ... |
It was quite cold on the day I added the sound insulation, so I borrowed the oil-filled radiator from our conservatory and used it to pre-heat the van before fitting the butyl panels, to ensure good adhesion. After I'd fixed the insulation, I also left the radiator switched on during the following night.