5mm White Diamond Stone Wall Panels & Ceiling Panels AKA White Sparkle. Tongue and Grooved . Ideal for your bath/shower walls going over tiles and on your ceiling 100% waterproof : Amazon.co.uk:
11 Materials for Shower Walls – Luxurious and Budget Friendly Options
Shower Walls And Panels: Smooth Wall, Subway and Square Tile Bath Wall Kits