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How to Repair a Broken Toilet Flange in Concrete? | Full Guide


Hey there! If you’re dealing with a broken toilet flange in concrete, you’ve landed on the right page. Over my seventeen years of experience in the plumbing industry, I have many experiences with toilet repair-related services. Many homeowners want to know How to Repair a Broken Toilet Flange in Concrete, today we will discuss it here perfectly.

One of those common issues is a broken toilet flange in concrete. Today, I’m going to share my wisdom with you in a way that’s easy to understand, like a conversation with an old friend. So, let’s dive right in and stay tuned with Plumbers Sherman TX always.

Understanding the Toilet Flange

Alright, let’s start with the basics. Imagine the toilet flange as the unsung hero beneath your toilet. It’s a circular piece of plumbing goodness that connects your toilet to the sewer pipe hiding under your bathroom floor. This flange is usually made of PVC or cast iron, and it’s securely anchored to the concrete floor. Why is it important, you ask? Well, it creates a watertight seal and keeps your toilet stable, so it doesn’t do the wobble dance while you’re trying to do your business.

Read More: What causes low water pressure in the whole house?

Signs of a Broken Toilet Flange

Before we get into the nitty-gritty of repairs, let’s talk about how you can tell if your toilet flange is crying out for help. Here are some telltale signs:

  1. Toilet Leaks: If you’ve noticed a puddle of water around the base of your toilet, you’ve got a flange issue on your hands.
  2. Toilet Wobble: Does your toilet feel like it’s doing the cha-cha when you sit on it? That’s a clear sign of a flange problem.
  3. Unpleasant Odors: A broken flange can let sewer gases sneak into your bathroom, creating some seriously unpleasant odors.

Tools and Materials You’ll Need

Now, let’s gear up. To tackle this repair, you’ll want to have some tools and materials ready to roll:


  • An adjustable wrench
  • Screwdriver
  • Hacksaw
  • Chisel and hammer
  • Pipe cutter
  • Electric drill
  • Measuring tape


  • A replacement PVC or cast iron flange
  • Wax ring
  • Concrete patching compound
  • Pipe adhesive
  • Screws
  • Safety goggles and gloves

Also Read: What are the two most common problems repairs with toilets?

Step-by-Step Guide: How to Repair a Broken Toilet Flange in Concrete

With your toolkit all set, let’s break down the repair process into easy-to-follow steps:

Turn off the Water Supply

First things first, shut off the water supply to your toilet. You’ll usually find the shut-off valve behind or beside your trusty porcelain throne.

Remove the Toilet

It’s toilet liberation time! Disconnect the water supply line and unscrew the nuts on the base of the toilet. Gently lift the toilet and place it on an old towel or a piece of cardboard to keep your floor safe from any toilet mishaps.

Inspect the Flange

Now, get up close and personal with the flange. If it’s cracked or severely damaged, it’s replacement time. If it’s just a little loose, you might try tightening it up.

Read: How to Plumb a Kitchen Sink Drain With Dishwasher

Remove the Old Flange

For the full replacement, you’ll need to bid farewell to the old flange. Use your trusty hacksaw to cut the PVC or cast iron pipe right below the flange. Take care not to damage the sewer pipe below. After the cut, employ a chisel and hammer to remove the old flange from the concrete floor.

Prepare the Concrete Floor

With the old flange gone, clean up the area and ensure there’s no debris or remnants of the old wax ring hanging around. A clean slate is your best friend here.

Install the Replacement Flange

Introduce your new flange into the floor hole. If it’s a cast iron flange, you might need to use a pipe cutter to adjust it to the right height. Make sure it’s level with the floor surface.

Also Read More: Why Plumbers Are So Expensive in Sherman, TX?

Secure the Flange

Time to lock in that flange. Use your electric drill to create pilot holes in the floor, then insert screws and tighten them up until the flange is rock-solid.

Apply Pipe Adhesive

Get friendly with some pipe adhesive. Apply it to the inside of the replacement flange and the top of the cut pipe. This creates a waterproof seal that’s as tight as a drum.

Install a New Wax Ring

Now, pop a fresh wax ring onto the horn of the replacement flange. This little beauty will make sure your toilet and flange are best buds, sealing out any leaks.

Reattach the Toilet

With your new setup ready, gently lower the toilet bowl onto the wax ring. Ensure the bolts on the flange fit into the holes on the toilet base. Give it a gentle push to compress the wax ring and create a watertight hug.

Reconnect the Water Supply

Hook up the water supply line to the fill valve on the toilet tank. Tighten those nuts to make sure everything is snug as a bug.

Test for Leaks

Time to do the moment of truth. Turn the water supply back on and give the toilet a flush. Keep an eye out for any sneaky leaks around the toilet base. If all looks dry, your repair was a success!

Replace the Toilet Tank

Reunite the toilet tank with the bowl, following the manufacturer’s guidelines.

Finishing Touches

Once you’re sure there are no leaks, apply some concrete patching compound around the base of the toilet. This seals the flange to the floor – follow the drying time instructions on the product.


So there you have it, my friends, repairing a broken toilet flange in concrete doesn’t have to be rocket science. It’s a manageable DIY project that can save you time and money. Just remember to take it one step at a time, use the right tools and materials, and stay safe throughout the process. With a little patience and some elbow grease, you’ll have your trusty toilet back in action in no time. Happy repairing!

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