Things You'll Need
Tile wet saw
Baseboards are designed to be placed along the bottom edge of a wall after the flooring material has been installed so that they hide the gap left along the wall for expansion during summer months. With porcelain tile, you may sometimes come across material that you want to use for baseboards that doesn't have pre-manufactured outside corners. You can cut your own outside corners on a tile wet saw so that you can wrap the corners with baseboard for a professional finish.
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Place a piece of tile on the tray of the saw. Hold the piece of tile upright against the gauge and adjust the position of the gauge on the tray until the tip of the piece lines up with the blade of the saw to cut a 45-degree section from the backside of the tile. The goal is to have two pieces that have the backsides cut off at 45 degrees so you can place them together along the outside corner to come together at a 90-degree corner, otherwise known as a miter.
Run the piece of tile through the wet saw to cut off the back of the corner. As you hold the piece upright on the saw tray, the face of the baseboard tile should be facing away from the blade, with the backside of the tile facing into the blade at a 45-degree angle so that you cut off a section of the corner to create a 45-degree wrap.
Turn the saw off, flip the gauge over and adjust it so you can do the same thing for the opposite corner piece. Move the gauge to the opposite side of the tray, adjust it with a piece of tile until the blade lines up with the tip of the face then cut the opposite piece.
Place the pieces on the wall where they wrap the corner so that the two pieces of porcelain bullnose match their 45-degree back cuts. You now have a wrapped outside corner that is set at 90 degrees and only has a slight grout joint where the two 45-degree cuts meet.
The process for making miter cuts on tile is the same as with wood or other materials.
Wear safety goggles when operating a tile wet saw.