I bought some 25mm thick x 440mm wide x about 2-2.5m long sheets of foam from Reverse Garbage (Details below - a great place to browse). They receive a weekly delivery of the stuff and sell it by the kilogram! It is amazingly cheap. One side has aluminium foil (aluminized-mylar) and the other has a peel-off plastic that rerveals a very good adhesive.
I have used it as sound deadening (and some thermal insulation) in my Transporter.
I can't recommend it highly enough for these purposes.
They also have another type of sound insulation that has a lead foil on one side! VERY serious. Lots of other foam too.
FWIW - I hope it is useful to someone else too.
Dave
http://www.reversegarbage.com.au/
Ppen to the public from 9am to 5pm, Monday to Saturday
296 Montague Rd
West End Qld 4101
Postal address
PO Box 5626
West End Qld 4101
Phone 3844 9744
Fax 3102 9184
Email info@reversegarbage.com.au
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