Were to buy 20mm polystyrene boards

[FMC]

I've looked everywere to try and find some bog standard polystyrene boards but cant find any ,just foil coated ones.Anyone got any ideas were I can find any.

 

[masona]

Do you mean these type? don't know about 20mm but Wickes sell them at 25mm and 50mm, 8' x 2' or 8' x 4'

 

[FMC]

thats exactly what i want ,but cant find it anywhere on the internet.Like i said in a previous the guy at the wood yard sold me 20mm battons ,which is making it a nightmare to find anything to fit it.

 

[noseall]

20mm battens? thats just bonkers! he must have sold you p.a.r. timber.
next time, buy some 25mmx50mm tannolised roofing lathe if you want to batten a wall or similar.
cheap as chips!