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Yes, your shower pan goes underneath your tiling and helps prevent excess water from seeping into the floor. Without the shower pan under your tile, water will seep through the grout and into the flooring. This will eventually lead to mold growth and serious water damage that could cost thousands of dollars to fix.

The rule tells you how to cut tile to install it in a corner. The 3/4/5 rule recommends that you should have 3 feet across on one straight line, four feet on the other perpendicular line, and 5 feet of length from the end of one of the lines to the other. You’re making a right triangle with the tile, and the hypotenuse (the line across from where the 3-foot lie and 4-foot line meet) should be 5 feet long.

To ensure an even and unbending surface to lay tiles on, you’ll typically need to put a subfloor under a tile floor. Fiber cement backboards are the most common choice, but using plywood is also possible. Don’t neglect this step, or you could risk water damage and grout or tiles prematurely cracking or crumbling, especially in an area with high foot traffic. 

Your floors should be completely level for tile, otherwise you risk damaging the tiles in the future. When there are even small gaps or hills in the subfloor beneath the tile, this puts more pressure on the tile when you walk around on the floor. With repeated traffic, the tiles are at risk of cracking, and you’ll have to deal with tile repairs sooner than if the floor was completely level.