I have a 1 1/2 storey block house built in 1946 . We are in the Niagara falls area. I would like to wrap the house in polyiso and tape the joints. Strap with 2x3s on edge and fill with sm also leave an 1/2″ air space. I would like as much as possible to make a thremo break with the poly. then install Hardi board 4×9 sheets board and batton style.
My supplier is worried I will get mositure between the polyiso and the block and migrate inside. The bolck is probbly full and is strapped with 3/4 furring and then plaster with a wool type insulation between.