Cut the niche sides a and top b to length from 1 x 4 boards tiled bathtub niche project diagram cutting list and drawing 1.
Wall to wall niche mitered tile.
If you re mitering the joints between the wall tiles and niche tiles as i am here the wall tiles must protrude into the niche box by the thickness of the tile and thinset and be mitered before you install them.
From a 1 x 8 board cut the shelf c to length.
As you can see in this picture steve is using 12x24 wall tile that s the same thickness as the sill.
By making the sill stick out by 1 16 he ll make the pencil tile hang out over the main tile by the same distance.
Sand the faces of all four parts with 120 grit and 180 grit sandpaper.
He explains the importance of location outlines the differences in using a premade or custom niche box and walks step by step through the process of installing the niche.