Showerwall Waterproof Panelling System | Bathroom Wall Panels.You simply cut the Shower panels to size and fix them to the wall, and you don't need to be a qualified tradesman. In fact, anyone who's competent at DIY can do it. waterproof. 100% Waterproof System Showerwall is the ultimate in bathroom wall panelling. The system provides an impressive watertight finish that looks.