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It’s easiest to start from an edge as it gives you a straight line. A problem may arise if your edge doesn’t line up perfectly, in which case it’s best to start from the center. Some think that starting tile from the center adds a focal point in the center of the hearth. 

Grout and caulk are commonly used together, especially in bathrooms. Grout goes between the tiles and keeps them sturdy and in place on the walls or floor. Caulk goes in corners or where two different materials meet (like where the bathtub meets the tile) to create a waterproof seal. However, they are not interchangeable—you shouldn't use caulk to adhere tile and shouldn’t use mortar if you need a waterproof seal.

The cost to install porcelain tile is about $1,930 on average. Porcelain tile prices range from $880 to $3,000 or more. The average cost tends to be higher than ceramic tile because porcelain tile is very durable. Porcelain tile rating also factors into the material cost. Tile ratings are as follows:

• Grade 0: Walls only

• Grade 1: Walls and light traffic floors

• Grade 2: Rooms with light traffic, but not kitchens or hallways

• Grade 3: Kitchens, hallways, and entryways

• Grade 4: Any area, interior or exterior

• Grade 5: Highest durability good for any area, interior or exterior

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.