second picture looks like celotex?? its all right I deliver it can be dusty thow so seal joins with tape its probably the best insultation you can get. But its expensive.
problem with polistyreene is its very flamable and gives off toxic fumes. The celotex if your near cardiff try 'A&A insulation, Spar depot, Llantrisant just off j34 they are about a3rd of the price as it is repaired reject stock and cash probably works very well!!
Celotex high performance polyisocyanurate (PIR) boards offer an unrivalled range of thicknesses from 12mm - 200mm , walls, cavityies, and floors ... along with a Class O fire rated product range for when project specifications demand enhanced fire performance
I deliver it (or used to think we lost the contract) for van use I d see if they ve got any damaged boards as you dont need an 8x4 in a van. Try Sheffield insulation theres a discount battle going on
What's the issue of it being fireproof? if the van catches fire I wont be in there I understand about fires whilst your asleep etc but don't forget that inside nearly all vans there is a lot of flammable materials (like all your cushions that are gagging to give of toxic fumes and all the timber and carpet) and there also a bomb in waiting called the fuel tank.....
I only bought 2 rolls and at 6 quid each I haven't lost very much...
Lastly - what methods are people using to stick/bond whatever insulation they use to the panels?
Doug
It is by will alone that I set my 'van' in motion!