12X12 Tile Tub Surround . Ideal for remodeling as panels glue up over existing surface. Then divide the answer by 12. Shower Tub Surround White Tile Advice from www.biggerpockets.com The tub has 2 sided back flashes (1 against the wall with faucet and 1 against the outer wall with window open to the backyard) the backflashes will be 16 inches in height where the long side. Ideal for remodeling as panels glue up over existing surface. And gray hexagon penny tile shower floor.