Remove Old Flanges — Expose and Assess Old Flange
Part of project
How to Replace a Cast Iron Toilet Flange with PVC · Step 2 of 10
In this video
After cleaning the area, the plumber removes the old flanges. He uses a specialized pipe reaming tool attached to a drill to cut out the inner PVC flange from inside the waste pipe. Next, he uses a pry bar and hammer to break and chisel away the old, rusted metal flange rings. This process fully exposes the rotted subfloor underneath.
Goal: Toilet Removal (Standard)
- Stuff a rag into the drain pipe opening to block sewer gases and prevent tools or debris from falling in while you work. Remember to remove it before installing the new toilet.
Used in this video
- Drill (brand: Milwaukee, Drill Type: Cordless drill) — Powering the pipe reamer to cut out the old PVC flange.
- Pipe Reamer/Cutter (brand: Lenox) — Cutting the old PVC flange from inside the drain pipe.
- Pry Bar (brand: Unknown) — Prying up and breaking apart the old metal flange rings.
- Hammer (brand: Unknown, Hammer Type: Claw hammer) · optional — Assisting the pry bar in breaking the old flange.
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FAQs
How difficult is replacing a cast iron toilet flange with PVC, and how long should I expect it to take?
This project is rated as intermediate. While it doesn't require specialized plumbing skills, removing the old cast iron and lead/oakum seal can be physically demanding and time-consuming. Expect it to take anywhere from half a day to a full day, especially if you encounter unexpected issues like a stubborn old flange.
What specialized tools are absolutely essential for removing the old cast iron flange and its lead/oakum seal?
Beyond basic household tools, you'll definitely need a cold chisel and a hammer for breaking up the old cast iron and carefully removing the lead/oakum seal. A shop vacuum is also crucial for quickly cleaning up debris and ensuring the cast iron pipe is spotless before installing the new flange.
What are the most important safety precautions I should take when demolishing the old cast iron flange and seal?
Always wear heavy-duty safety glasses to protect against flying fragments and a respirator (like the Honeywell R95) to avoid inhaling dust and potential lead particles from the old seal. Heavy-duty gloves are also essential to protect your hands from sharp edges and the demolition tools.
What's a common mistake when installing the new PVC compression flange, and how can I avoid it?
A common mistake is not thoroughly cleaning and deburring the inside of the cast iron pipe after removing the old flange. Any rough edges, rust, or debris can compromise the compression seal of the new PVC flange, leading to leaks. Ensure the pipe's interior is smooth and completely clean for a watertight fit.
Remove Old Flanges — Expose and Assess Old Flange
Part of project
How to Replace a Cast Iron Toilet Flange with PVC · Step 2 of 10
In this video
After cleaning the area, the plumber removes the old flanges. He uses a specialized pipe reaming tool attached to a drill to cut out the inner PVC flange from inside the waste pipe. Next, he uses a pry bar and hammer to break and chisel away the old, rusted metal flange rings. This process fully exposes the rotted subfloor underneath.
Goal: Toilet Removal (Standard)
- Stuff a rag into the drain pipe opening to block sewer gases and prevent tools or debris from falling in while you work. Remember to remove it before installing the new toilet.
Used in this video
- Drill (brand: Milwaukee, Drill Type: Cordless drill) — Powering the pipe reamer to cut out the old PVC flange.
- Pipe Reamer/Cutter (brand: Lenox) — Cutting the old PVC flange from inside the drain pipe.
- Pry Bar (brand: Unknown) — Prying up and breaking apart the old metal flange rings.
- Hammer (brand: Unknown, Hammer Type: Claw hammer) · optional — Assisting the pry bar in breaking the old flange.
Frequently Asked Questions
How difficult is replacing a cast iron toilet flange with PVC, and how long should I expect it to take?
This project is rated as intermediate. While it doesn't require specialized plumbing skills, removing the old cast iron and lead/oakum seal can be physically demanding and time-consuming. Expect it to take anywhere from half a day to a full day, especially if you encounter unexpected issues like a stubborn old flange.
What specialized tools are absolutely essential for removing the old cast iron flange and its lead/oakum seal?
Beyond basic household tools, you'll definitely need a cold chisel and a hammer for breaking up the old cast iron and carefully removing the lead/oakum seal. A shop vacuum is also crucial for quickly cleaning up debris and ensuring the cast iron pipe is spotless before installing the new flange.
What are the most important safety precautions I should take when demolishing the old cast iron flange and seal?
Always wear heavy-duty safety glasses to protect against flying fragments and a respirator (like the Honeywell R95) to avoid inhaling dust and potential lead particles from the old seal. Heavy-duty gloves are also essential to protect your hands from sharp edges and the demolition tools.
What's a common mistake when installing the new PVC compression flange, and how can I avoid it?
A common mistake is not thoroughly cleaning and deburring the inside of the cast iron pipe after removing the old flange. Any rough edges, rust, or debris can compromise the compression seal of the new PVC flange, leading to leaks. Ensure the pipe's interior is smooth and completely clean for a watertight fit.