Here we offer general instructions and precautions for roughing in, as well as installation procedures for tying into your present drain waste vent and supply systems. When all the roughing it has been completed and you are ready to assemble your toilet, your rough plumbing should resemble. To install a toilet,

The closet bend and toilet floor flange must be roughed in first. When replacing a toilet, you will need to scrape up the old wax gasket. A putty knife works well for this. Remove the old bolts from the floor flange and scrape the flange clean to prevent leaks at the base of the new bowl. If the old flange is cracked or broken, replace it with a new floor flange.

Position the floor flange so that the underside of the flange is at the level of the finished floor. You may need to use a piece of finished flooring material if the floor has not yet been installed.