How to Replace a Cast Iron Toilet Flange

Replacing a cast iron toilet flange is easy as 1-2-3. There are many methods and products on the market to make this task easier for everyone. Each situation may require a unique procedure for the most reliable repair. Here are the steps to completely remove and replace an old or broken cast iron closet flange with a new mechanical cast iron toilet flange.

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Things You'll Need

  • Drill
  • Metal Bits
  • Cold Chisel
  • Heavy Screw Driver
  • Claw Hammer
  • Face Mask
  • Leather Gloves
  • New Mechanical Cast iron Toilet Flange
  • Seal the open to the sewer line with an expansion plug or large towel to prevent debris from entering the drain system.

  • Drill out the old lead seal that is holding the cast iron toilet flange in place. This is the soft metal seal that is in between the outer closet flange and the inner sewer pipe. Once you have have drilled as much lead as possible, remove the remaining lead with a heavy screw driver.

  • Remove the Oakum packing material that is located under the lead seal with a heavy screw driver or chisel.

  • Remove the cast iron toilet flange, you may need to use a hammer and chisel to loosen or even break the remaining flange.

  • Install the new mechanical closet flange in place. Level as evenly as possible. Tighten bolts to the manufacturer's specifications.

Tips & Warnings

  • Dispose of all lead and cleanup material properly, contact your your local waist disposal facility for instructions.
  • Wear face mask, eye protection and heavy gloves.
  • Clean all tools, equipment, skin and clothing with care that have into contact with any lead material.
  • Photo Credit
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