The adjoining tiles in the area of the profile must be chamfered by 45°.
When creating 3 way external corners, always start by embedding the pre-fabricated parts of the corner set in the tile adhesive. The following work sequence must be observed:

1. left corner piece (1 trapezoid perforation),
2. right corner piece (2 trapezoid perforations),
3. lower corner piece (3 trapezoid perforations),
4. cut profiles to size and set them in place.