We've got our roof on and have windows being installed later this month - the installation includes air-tightness tape inside + outside so am expecting this to be pretty effective. House is ICF and we've applied tape around roof connections to walls - hope/anticipate that the main the walls/floor junctions will be fine. Trouble is that we have 3 doors inc the main entrance area (2m x 2.6m) areas that we won't have installed for some months yet but I'd like to see how the air-tightness is shaping