My builder has installed a PIR insulation solution for a block/block cavity wall. The PIR solution suggests that it should be tight to the inside cavity providing a void on the back of the outer skin. This is to allow any water ingress to drop to the bottom. However they have filled the cavity with 2x50mm PIR. This will be brilliant thermally, but the manufacturer says that they can guarantee that it will act as a bridge for moisture.
What to do? - its built to second floor.....
What to do? - its built to second floor.....