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Just spoke to a company who does expandable PU foam for cavity walls and while they confirmed that PU is much better material for cavity insulation the cost of getting rockwool out would be much higher than to put it in.

i was thinking about self expanding PU foam. you simply pour it into cavities similar to injecting mineral wool

i have no idea how it was installed to be honest but when i look into PU foam insulation they claim that k-value is almost double of rockwool

similar to this http://www.askjeff.co.uk/cavity.html

We have recently moved to a 1960s built house which had cavity walls insulated in 1972. The material that was used is Rentokil Rockwool and the procedure was performed by Rentokil Limited which doesn't seem to trade any more. I was thinking that 40 years is quite a long time. Can this...