My shelf is high and the bottom is visible. How do I tile it?

The BT-17 was anticipated for a higher mounting location than our bench products. It has therefore been designed with a series of ½” holes completely perforating the bottom of the unit to make it easy to tile. You install the bottom tiles using standard thin-set or mastic which will adhere via the direct bonding path to the exposed mortar in these holes. Grout and seal as normal.