Toilet installation tips in Zerega Plumbing and Heating.
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. 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. (It is always best to install the finished floor so that it runs underneath the toilet.) You may need to use a piece of finished flooring material if the floor has not yet been installed. Now you can finish tightening the screws that hold the floor flange to the floor. Put a small level on the flange while tightening to be sure it is level.
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