We're in the process of having a small extension done on our kitchen.
I have a question regarding the insualtion the builder is using in the cavity.
The outer skin of the wall is reclaimed random stone so the cavity gap is not uniform all the way down. The exisitng part of the wall has rock wool in it but i've found that he's fitting 25mm slabs of bog standard polystyrene in the new part. Is this really suitable/effective? or should he be using rockwool or kingspan?
thanks in advance
I have a question regarding the insualtion the builder is using in the cavity.
The outer skin of the wall is reclaimed random stone so the cavity gap is not uniform all the way down. The exisitng part of the wall has rock wool in it but i've found that he's fitting 25mm slabs of bog standard polystyrene in the new part. Is this really suitable/effective? or should he be using rockwool or kingspan?
thanks in advance