Whilst we were in lockdown I was tasked with solving a water ingress issue in a client’s gym building, between us we discovered the damp-course membrane was actually drawing in water through a capillary action and making the interior very wet, but only when the wind direction was right (or wrong!), I addressed this with a bevelled cement footing, also known as flaunching, which seals the wall base and floor together, but also directs water blown against the wall into the cleaned out drainage channels. The flaunching was later sealed with a rubberised coating.