ou would never have a shower without tile…. But you COULD. When it’s Orange, it’s waterproof. The Key to a Successful Tile Shower: Waterproofing.Tiles and grout are not waterproof. Big or small, extravagant or simple, the key to any successful shower installation lies in what’s underneath your tile: your waterproofing system. And with the average shower getting more water than the roof of your house, it’s imperative to have a proper waterproofing system in place.