ARI, Good luck with the new house, but it is you that has a lot to learn. Windows that can breathe are great . Your cavity system on your chilly bin house leaves a lot to be desired. It stops the suction problem but it falls over very badly later on as you will find. Lift a bottom plate up and look at the state damp course gets in after a few years. Remove the outside cladding and see what happened to the building paper. Fix lots of jobs up like i have done then you wont be so smug about living in a chilly bin. macdunk