How to Replace a Toilet Flange

Flanges are the unsung heroes of your bathroom, acting as the structural anchor and leak-proof bridge between your toilet and the drainpipe. When a flange cracks or the metal ring corrodes, your toilet will inevitably wobble, leading to failed wax rings and slow-motion water damage beneath your floor. Getting this right requires precision, as the flange height dictates the final seal of your toilet. A job done well means a rock-solid base that stays dry for decades. Take your time with the removal of the old assembly; rushing here is the fastest way to crack your drain line.

1. Strip Away the Old Ring. Cut through any caulk around the base and clear away the old wax ring. Use a screwdriver to pry up the old ring or a reciprocating saw with a metal-cutting blade if the flange is glued or fused to the pipe.
2. Clear to Clean Subfloor. Scrape away all old grout, wax, and debris from the floor surface around the pipe. The area must be perfectly level and clean for the new flange to sit flush.
3. Verify Flush Alignment. Insert the new flange into the pipe to ensure it sits flat against the finished floor. If the flange sits too low, use a flange extender to bring it flush with the floor surface.
4. Bolt Down Solid. Mark the mounting holes on your subfloor and drill pilot holes if necessary. Screw the flange directly into the subfloor using corrosion-resistant screws.
5. Create Airtight Bond. If your flange is the type that slips inside the pipe, apply PVC primer and cement to the connection point according to the product label. Ensure a complete, airtight seal around the pipe circumference.
6. Confirm Rock-Solid Base. Check that the flange bolts can slide freely in the slots and that the flange remains stationary when pressed. Once solid, you are ready to set the wax ring and toilet.