I used a single role of rather expensive £60(ish) space age stuff from the local Focus store. It's made of foil and plastic and wadding and compressed down to 'very thin'. I removed all the Rockwood which was wet were the rot was! That helped then!
Here's what the insulation looks like during insulating the floor.
[img:800:536]
http://www.volkswagent25.co.uk/assets/insulat1med.JPG[/img]
The insulation was cut to size and joined with ali. Tape. One roll did the most of the van (floor, all side panels and sliding door. Not enough for under the cab mat or the rear and front doors - another roll should do this).. It helped massively with keeping the heat in and we defiantly noticed a difference under foot. It should be even better with the second half sorted and worked out how to stop the draft from the front vents. At some point I'm going to write up and include more pictures on my
site (one day!).
Next trick was to splash out on a
JK's 8 Piece Thermo Mat kit (£60 full price), not used them yet but nicely made and have high expectations they'll be the nuts!.
So, complete van will be insulated for about £180, worth every penny, IMHO.[/url]