Install a Toilet Flange Repair Ring

Toilets don't leak because they feel like it. They leak because the flange—the cast iron or plastic ring that connects your toilet to the sewer pipe—has cracked, corroded, or broken away from the floor. Sometimes the bolt slots snap off. Sometimes decades of moisture rot the surrounding wood. Sometimes an overzealous installer cranked the bolts too tight and the whole thing gave up. Whatever the cause, a flange repair ring solves the problem without ripping out pipe or cutting into concrete. The repair ring is a simple solution. It's a reinforced metal or plastic ring with fresh bolt slots that sits on top of your damaged flange, secured with stainless steel screws. You're not replacing the flange—you're building a new sealing surface above it. The repair ring raises the flange height slightly, gives you intact bolt holes, and lets you set the toilet properly. Done right, it's as permanent as the original installation, and nobody will ever know the difference.

1. Remove the toilet and assess the damage. Turn off the water supply and flush the toilet to empty the tank. Disconnect the water line, then unbolt the toilet from the flange. Lift the toilet straight up and set it aside on cardboard. Scrape away the old wax ring completely with a putty knife. Inspect the flange for cracks, broken bolt slots, or sections that have corroded away.
2. Clean the flange and floor surface. Remove all traces of old wax, caulk, and debris from the flange and the floor around it. Use a plastic scraper to avoid scratching the flange surface. Vacuum out the area thoroughly. The repair ring needs clean contact with both the existing flange and the floor to seal properly.
3. Select and position the repair ring. Choose a repair ring that matches your flange type—cast iron rings for metal flanges, PVC rings for plastic. Place the ring over the damaged flange, aligning it so the bolt slots are positioned correctly for your toilet's mounting holes. The ring should sit flat and cover the damaged sections completely.
4. Drill pilot holes through the ring and flange. Mark the screw hole locations through the repair ring with a pencil. Remove the ring and drill pilot holes at each mark using a bit slightly smaller than your screws. For cast iron flanges, use a metal bit. For PVC, use a standard twist bit. Pilot holes prevent cracking and ensure screws bite properly.
5. Secure the repair ring with stainless steel screws. Reposition the ring and drive stainless steel screws through each hole into the flange below. Tighten screws evenly in a star pattern to pull the ring down flat. Don't overtighten—you want firm contact without cracking the ring or stripping threads. The ring should be completely stable with no movement when you test it.
6. Install new closet bolts in the repair ring. Insert new closet bolts into the repair ring's slots with the threaded ends pointing up. Position them so they'll align with your toilet's mounting holes. If the ring has adjustable slots, orient bolts perpendicular to the back wall. Secure bolts with the included washers or clips so they stay upright during toilet installation.
7. Set a new wax ring and reinstall the toilet. Place a standard wax ring centered on the repair ring, with the tapered side facing up. Lift the toilet and align the mounting holes with the closet bolts, then lower it straight down onto the ring. Press down firmly while rocking slightly to compress the wax. Don't lift the toilet once it's seated—this breaks the wax seal.
8. Bolt down the toilet and reconnect water. Thread washers and nuts onto the closet bolts. Tighten nuts in alternating passes, a quarter turn at a time, until the toilet feels solid but not over-compressed. The toilet shouldn't rock, but you shouldn't feel resistance that might crack the porcelain. Reconnect the water supply line, turn on the water, and flush several times while checking for leaks at the base.