If achieving sufficient airtightness seems complex or challenging, there is a simple solution, according to DuPont: work with a proven system of products – and the expert team behind them. DuPont explains that a recent "passive house" demonstration at BRE featuring key DuPont membranes, AVCLs and tapes, had "extraordinary results". A specially built structure was fitted with Tyvek Supro Tyvek …