The record is matter to vary once in a while and the most current is often uncovered on OFGEM’s website. Open-mobile foam is lighter and less expensive but really should not be used down below ground stage the place it could take in drinking water. Consult an expert insulation installer https://freeecogrants.co.uk/how-can-you-have-free-external-wall-insulation-done-to-your-property/