Just priced up some insulated plasterboard that will be used on 9 inch breeze block wall that is rendered on the exterior. The builders merchant also sell a plasterboard backed with 50 mm polystyrene and I am wondering if the u values would be the same as the 50 mm thermo boards made by kingspan ect... as it would save about £12 per board and we are going to be using about 15 boards.
Many thank yous
Many thank yous
