i'm replacing all the rotten bits at front and sides of my van,thought it would be easier just to scrape old polystyrene sheets and fit new ones due to the uneven surface.
may have to get 25mm and cut it down but really dont want to do that if at all possibble.
thanks for that ollie,there's a builders merchant not far from me that does celotex stuff so will give them a try in the next few days,need to source wall boards also now but have a few lines to try with this.
got my local builders merchant to order me up the celotex in 20mm thickness,got it yesterday and started fitting it,perfect size and a pleasure to work with.
many thanks for the heads up on this Ollie,just need to get my wallboards ordered to hopefully get it finished and get back out in it on october school break.