location of where the tub drain will be situated, remove tub and place on & blanket or piece of cardboard 3. Place 2 pieces of lumber, long enough to span the width of the fub at the location where the tub will be installed and place tub on top of the lumber support rails, 4. Connect the drain to the waste line, close the drain on the tub and fill it with water, allow the ‘water stand for 30 minutes, check for leaks.