yeah, this 'exterior' insulation with bare studs showing on the inside (if the drywall is taken down, or none is put in), you have to do a bang up job putting up the exterior water barrier sheathing spot on. Poly Wall® Home Stretch™ Peel 'N Stick/ICF Waterproofing Membrane high-density polyethylene (HDPE) looks and works the same as Butyl tape, but much wider and stretches all the way over the house so you have no air leaks in the house. Remember to also have an air heat exchanger to have ventilation in the house, else everyone dies of breathing in each others farts all day Perfect Wall Review - A system to Build an efficient house! https://youtu.be/hTwq-qUnr9I This seems to be a good match for old houses where you only care about when the house only has a good foundation and can rip off all the siding Exterior insulation retrofit: walls and unvented roof https://youtu.be/JmsosK2My6o