Original description in tower fire thread was of polystyrene glued to plywood, now know tower to be different.
Polystyrene or PIR foam sandwiched between sheets of OSB does describe Structurally Insulated Panels, SIPS.
Was quite keen on this method of construction potentially for some single level workshop/office space. Its simple, quick and very highly insulated.
It can achieve Class 0 fire rating when lined internally with plasterboard.
Appears a petrol soaked rag wrapped in tinfoil can achieve a Class 0 fire rating.
Quite honestly am considerably more wary of using PIR foam insulation anywhere now.
What`s the alernatives, natural sheeps wool? mineral wool? something else?
Thanks!