Chris Bacon wrote:
Phil L wrote:
The wall is 'sealed' from any sources of fire (plasterboard is a
good fire proofing) and the fibreglass/rockwool will never melt and
give off toxic fumes if something does ever happen.

Is there some confusion here? Rockwool and fibreglass can actually be
used for fire protection. The stuff's inert, and can't give off toxic
fumes. Are you thinking of expanded polystyrene?

No, if you read it again you will see that I've written 'it will never melt
and give off toxic fumes'
It was a 'warning' against using polystyrene.

HTH