What is the minimum aerated block size and dot+dabbed insulation thickness required to meet current Building Regulations and be equivalent to a filled cavity wall construction for an extension?
E.g. Would 140mm thermalite/celcon blocks with 50mm PIR be sufficient? Or would 190mm blocks be necessary?
E.g. Would 140mm thermalite/celcon blocks with 50mm PIR be sufficient? Or would 190mm blocks be necessary?