RE: O/T Stalkers27 Jul 2022 16:18
For New builds they may be viable (I am no expert), but we have many old and beautiful and or protected buildings in the U.K. that are very poorly insulated, and very difficult to retrofit with insulation.
We also have many buildings that should be torn down but it is cheaper for underfunded councils and private land lords to keep them going. The tenants pay the price in their energy bills and poor living conditions.