Short tile piece needed to finish row on an inside corner
The challenge is to place the remaining tile section into the edge trim while also getting the interlocking tile edges locked together.
First, install the inside corner trims into each corner using adhesive. Allow 24 hours for the adhesive to cure. Make sure the corner trims are oriented as in the image below. Each inside corner trim piece has a full and a partial channel. The full channel will be against the back wall.
Next, determine the length of the tile section. Measure from the inside lip of the previously installed tile to the inside edge of the pre-installed trim. See image at left for details. In this case, the length to cut the final tile in the row is 4-3/4-inches.
After cutting tile to length, apply adhesive to the substrate, as shown. Spray a squirt or two of water onto the substrate and adhesive, as shown. This will lubricate the substrate allowing for easier movement.