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To create a four square pattern on an angle with the tiles, you want the tops of angles or diamonds to line up straight across the room so you have symmetry.
Make a perfect 45-degree angle for a starting line. Make a 90-degree angle using the rule of 3, 4, 5. This says a triangle with sides of three feet, four feet, and five feet creates a perfect 90-degree angle.
Lay out the pattern to determine the exact placement. Mark the first tile location.
Apply the recommended tile adhesive using a 1/32" V-notched trowel. It leaves behind a minimal amount of glue. You want 100 percent coverage on the underlayment. The adhesive needs about 20 minutes of open time to flash. The adhesive is ready when it goes from creamy to clear.