Home › Sewer line repair › Cast iron pipe guide
Cast iron pipe in Tampa homes: descale, repair or replace?
If your home was built before the mid-1970s, there’s a good chance cast iron drain pipe runs under your slab. Here’s how to tell when it’s failing, and how to pick the right fix without overspending.
Why cast iron fails in Tampa Bay
Cast iron was the standard material for drain and sewer lines in American homes for decades, until PVC took over around the 1970s. It’s strong, but it doesn’t last forever. Over time the inside of the pipe rusts and builds up a rough layer of scale. That scale narrows the pipe and catches paper and waste, which is why older homes get clogs that keep coming back.
Eventually the pipe wall thins out. The bottom of a horizontal line can rot through completely, especially under a slab where you can’t see it. Cracks let in roots and let sewage leak into the soil under your home.
Warning signs of failing cast iron
- The same drain clogs again a few weeks after it was cleared
- Several fixtures drain slowly or gurgle at the same time
- Sewer smell inside the house, especially near floor drains or the laundry
- Water or sewage backing up into a tub or shower when the washer drains
- Cracked or damp flooring, or unexplained wet spots near exterior walls
Your three options
1. Descaling. We use a cable machine with specialized cutting heads to grind the rust and scale off the pipe walls and restore full flow. If the pipe still has solid walls, descaling can buy years of life for far less than replacement.
2. Spot repair. If one section is cracked, rotted or broken, we replace just that section with PVC and tie it back into the good pipe. This is common where a line runs outside the house to the cleanout.
3. Replacement. When the camera shows the pipe is thin, rotted through or broken in several places, replacing it with PVC is usually the better long-term value. Under-slab work costs more, so we map out exactly what needs to go before quoting.
How a camera inspection helps you decide
For $349 we run a camera through the line, show you the footage and point out scale, cracks, roots and sags. Then you get a firm price for each option that makes sense, and you choose. Many homeowners start there before buying an older home, too.
What does it cost?
Every cast iron job is different, so we quote after we see the pipe. As a starting point: main line clog clearing starts at $298, main line hydro jetting starts at $940, and a camera inspection is $349. Larger repairs and replacements are quoted as a firm price before any work begins, and financing is available through Acorn Finance and Klarna.