5. Set tub into place, make sure the tub is label, make sure that the mortar bad is in contact with the entire tub basin. 6. Secure to the wall with galvanized screws at the espadrille screw location, apply weight to the middle of the tub until the mortar sets. 7 8 Water-Resistant Silicone Sealant 7. Conn act the tub drain to your drain system. 8. Install water resistant gypsum board and finish surface material (tile, stone) and seal all edges with silicone caulking to prevent water damage.