Plumbing problem of repairing a Leaking Toilet Flange solved, know How to repair a Cast-Iron Toilet Flange

April 9, 2018
First Published On: August 9, 2017
by HitBerry

Most of the time, cast-iron Toilet Flange can easily be damaged and rusted due to a number of factors. If the toilet is unsteady and shaky, then this can cause the flange to crack or leak. Yes, we know you desire a leak-proof toilet flange, though it sounds pretty awesome, to be honest, a leak-proof toilet flange is a myth as the time passes by the flange gets leaky for sure.


It's kind of easy to damage the flange when you do anything with your bathroom flooring. And once it is damaged you are in all sorts of leaking around the toilet flange related problem. So, is the flange leakage really a plumber caller code?

Leaking Toilet Flange repair Leaking Toilet Flange repair

Honestly, with the right techniques and the right tool, you can do it easily. The situation can get pretty intense if you negate it. At the same time, it affects the whole of your home's sanitation as The flange is the important part of your toilet which helps to connect the waste of your pipe.

Read more: Plumbing made easy, along with tricks for Leaking Toilet repair

Also know: Stuck with a shower valve repair related problem?

In older days toilets were made out of cast iron, but nowadays toilets use flanges made out of PVC more. If the flange is broken or damaged, it can cause your toilet to leak. But no worries, we are here to find out a solution to your problem. So, without further delay let's begin exploring some easy steps on how to repair a cast-iron toilet flange.

Also See: How to Repair a Kitchen Sink Drain Pipe?

Know how to solve: Frozen and Burst Pipes related issue in winter

Here is a descriptive video on repairing toilet flange we from homeowner series, we hope you like it:

Here we have some easy steps that you should follow to repair a cast-iron toilet flange:

  • First of all, Close the shut-off valve behind of your toilet to stop the flow of water.
  • Then Remove your toilet lid from the tank. Flush out your toilet and hold down the flush lever to drain as much of water as you can.
  • Then unscrew the floating ball inside the tank.
  • Use a large sponge to soak up the all remaining water from inside of the tank to the bottom of the toilet bowl.
  • Remove all nuts from the closet bolts on each side of the toilet base. If any nut is rusted then, you can cut out the bolts with a close-quarter hacksaw blade.
  • Remove the water supply line from the underside of the toilet tank.
  • Rock the toilet back and forth to break its wax seal with the drainpipe. Lift the toilet and carry it out of the room.
  • Then use the stiff-blade putty knife to remove scrape away from the wax gasket from the closet flange.
  • Unscrew and remove all extension rings to expose the cast-iron closet flange.
  • Use a hammer and cold chisel to chop out the flange if is badly corroded.
  • Pull out the loosened flange of the cast-iron drain pipe with the help of pliers.
  • Vacuum up all dust and dirt from around the drainpipe of the bathroom floor.
  • Then Set four wood blocks around the drain pipe to hold the new closet flange at the correct height.
  • Start installing plastic expansion to the flange into the cast-iron drainpipe.
  • At the inside of the flange use the ratcheting hex-key to tighten the four screws until the flange is tight wedged onto the drainpipe
  • Then Slide two new bolts into the slotted keyways in the flange.
  • put on a rubber toilet gasket over the bolts and into the closet flange.
  • Then Set the toilet back onto the top of the gasket.
  • Be careful not to crack the toilet base. Then start with a closet bolt at first put a plastic washer, stainless-steel washer, and hex nut. Then tighten it carefully each nut with a wrench, be careful not to break toilet bars.
  • Cut off the unwanted bolt with the hacksaw.
  • Snap the closet bolts with a plastic caps to conceal.
  • Then reattached the toilet tank water supply.
  • Screw up the ball float back onto the flush valve.
  • Then check shut-off valve and flush the toilet to ensure it's working properly.

So these were the simple steps that you can take to repair your leaking toilet flange, we hope you enjoyed this section and learned how to avoid problem-related to your toilet flange related issue. Stay with Hitberry for more on your home-related issues.