Keep in mind that solid pieces of tile, marble or granite are best for the top of a curb.  Tiled curb tops increase the likelihood of leakage and encourage the growth of mold or mildew because water collects in grout joints on horizontal tiles  The shower door seal functions best on a smooth surface.

Shower doors should be installed in such a way that nothing interferes with their movement and there are no gaps between the door and the wall.  Environments that interfere with door movement are raised decorative tiles and overhanging tiles, and granite or marbles slabs atop a shower seat or buttress wall.  The tile or granite […]

To minimize leakage, position shower heads toward tiled walls or fixed panels.  Shower heads should never be positioned opposite a door or other opening.  Exceptions may be made for smaller or low-flow shower heads or shower heads that point straight down at the floor.

The soffits or eaves along the top of the shower enclosure must line up perfectly with the angles i the curb below in order to avoid an uneven look.

Drilling into glass tiles can cause breakage. Avoid mounting door hinges and glass clips onto glass tiles, as breakage is likely to occur during and even after installation.  This can result in delays in getting the project finished and additional charges from the tile installers for repairs.