Cut Drain Pipe to Correct Height
Part of project
How to Replace a Cast Iron Toilet Flange with PVC · Step 4 of 6
This guide provides comprehensive, step-by-step instructions for removing an old, broken, or corroded cast iron toilet flange and replacing it with a modern, durable PVC flange. The process involves removing the toilet, breaking apart the old cast iron flange, cleaning the existing drain pipe, and installing the new PVC flange assembly using a flexible transition coupling.
29K subscribers
FAQs
How long should I expect this cast iron flange replacement project to take for an intermediate DIYer?
This project typically takes 3-6 hours, depending on the condition of the old flange and your prior DIY experience. It's rated intermediate due to the physical effort required to break cast iron and the precision needed for pipe cutting and fitting.
What are the most important safety precautions I need to take when breaking apart the old cast iron flange?
Always wear safety glasses, heavy-duty impact gloves, and hearing protection to shield against flying debris and loud impacts. Ensure good ventilation to minimize dust inhalation, and use a shop vacuum to carefully clean up all cast iron fragments.
What should I do if the existing cast iron drain pipe is too corroded or cracks further down when I try to remove the flange?
If the pipe is severely corroded or cracks below the flange, you might need to cut the cast iron pipe further down. This usually requires a specialized cast iron cutter or an angle grinder with a diamond blade. In such cases, installing a 'no-hub' coupling to connect to new PVC or consulting a professional plumber may be necessary.
Why is a flexible transition coupling like the Fernco specifically recommended for connecting the new PVC to the old cast iron?
A flexible transition coupling is essential because it's designed to create a watertight seal between dissimilar pipe materials, such as cast iron and PVC, which often have slightly different outer diameters. It accommodates minor imperfections in the old cast iron pipe, ensuring a secure, leak-free connection without needing to perfectly match pipe ends.
Cut Drain Pipe to Correct Height
Part of project
How to Replace a Cast Iron Toilet Flange with PVC · Step 4 of 6
This guide provides comprehensive, step-by-step instructions for removing an old, broken, or corroded cast iron toilet flange and replacing it with a modern, durable PVC flange. The process involves removing the toilet, breaking apart the old cast iron flange, cleaning the existing drain pipe, and installing the new PVC flange assembly using a flexible transition coupling.
Frequently Asked Questions
How long should I expect this cast iron flange replacement project to take for an intermediate DIYer?
This project typically takes 3-6 hours, depending on the condition of the old flange and your prior DIY experience. It's rated intermediate due to the physical effort required to break cast iron and the precision needed for pipe cutting and fitting.
What are the most important safety precautions I need to take when breaking apart the old cast iron flange?
Always wear safety glasses, heavy-duty impact gloves, and hearing protection to shield against flying debris and loud impacts. Ensure good ventilation to minimize dust inhalation, and use a shop vacuum to carefully clean up all cast iron fragments.
What should I do if the existing cast iron drain pipe is too corroded or cracks further down when I try to remove the flange?
If the pipe is severely corroded or cracks below the flange, you might need to cut the cast iron pipe further down. This usually requires a specialized cast iron cutter or an angle grinder with a diamond blade. In such cases, installing a 'no-hub' coupling to connect to new PVC or consulting a professional plumber may be necessary.
Why is a flexible transition coupling like the Fernco specifically recommended for connecting the new PVC to the old cast iron?
A flexible transition coupling is essential because it's designed to create a watertight seal between dissimilar pipe materials, such as cast iron and PVC, which often have slightly different outer diameters. It accommodates minor imperfections in the old cast iron pipe, ensuring a secure, leak-free connection without needing to perfectly match pipe ends.