Hello and welcome..
You can get corner finish trims like these from schluter..
Schlüter®-DILEX-EKE/-EF
Schlüter-DILEX-EKE and Schlüter-DILEX-EF are single-part corner profiles for interior wall corners. If the floor covering is not constructed as a floating screed, Schlüter-DILEX-EKE and Schlüter-DILEX-EF may also be used as flexible floor/wall transitions. The trapezoid perforated, lateral anchoring legs are firmly embedded in the adhesive below the
tile covering. In the case of Schlüter-DILEX-EKE, one of the anchoring legs forms a chamber for inserting cut
tile edges. In the case of Schlüter-DILEX-EF, the tiles abut the profile from both sides, leaving a uniform joint space. The
tile surface can be either flush with the profile edge or up to approx. 2 mm lower, which allows for choosing a variety of
tile thicknesses. Completely fill the joint between the profile and the tiles with grout (or partly with
tile adhesive during installation). The visible movement zone is only 5 mm wide. It must be verified for individual projects whether this 5 mm zone is sufficient for the expected movements.
Schlüter-Systems UK Homepage +44 (0) 1530 813396 - Schlüter-Systems