Repairing Guides

how to repair cast iron sewer line

by Joanny Kilback DVM Published 2 years ago Updated 2 years ago
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4 Ways to Fix a Rusting and Leaking Cast Iron Sewer Pipe

  1. Hydro-jetting. Not long ago, clogged sewer lines were snaked using long, steel augers. With hydro-jetting, just as the name suggests, we use high pressurized water to clean out clogs.
  2. Pipe bursting. If a pipe has lost its structural integrity or has a straight run, we will use pipe bursting instead.
  3. Trenchless sewer pipe lining. Also called structural pipe lining, or cured-in-place lining (CIPP), sewer pipe lining involves a special, epoxy-impregnated liner to create a new pipe directly inside your ...
  4. Conventional sewer repair. Unfortunately, sometimes a sewer pipe is so badly damaged that no trenchless sewer repair is available.

Part of a video titled How to Repair Cast Iron Pipe Cracks, Avoid Plumbing Fails
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What we're probably going to do is we'll use some jb weld. So we use this a lot to you know patch upMoreWhat we're probably going to do is we'll use some jb weld. So we use this a lot to you know patch up things like that and this will work pretty good here on plumbing.

Full Answer

What is the average cost of sewer line repair?

What is the Average Cost of Sewer Line Repair & Replacement? The sewer line repair cost varies from $4,000 to $25,000. On average, expect to pay $92 to $238 per foot as a sewer line replacement cost. Traditional replacement methods average a cost of $7,500.

How much does it cost to replace a sewer line?

Sewer Line Replacement Cost. If you want to get your sewer line replaced, expect to pay between $50 and $250 per foot. Most homeowners pay $50-$125 per foot. The actual amount that you will spend will depend on the length of the line, and how it is placed on your property, and the type of plumbing you use.

How do you repair a broken sewer line?

The Firm repairs broken tanks, cleans clogged-up tanks ... The company says it is here to create a difference in sewer line repair. It has a professional workforce that will tend to all your needs with utter professionalism and top-notch service delivery.

How do you replace a sewer line?

  • You have recurring issues with your sewer line. If you’ve had to repair your sewer line multiple times recently or had to continuously clear out clogs, it’s possible it will ...
  • Your sewer line is old. ...
  • You have a significant amount of damage to your sewer line. ...
  • Your sewer fails an inspection. ...

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Can you repair cast iron sewer pipe?

If you have a small section of visible cast iron drain pipe with a leak or crack, you may repair the pipe yourself. But only if the problem is small and isolated, if there are leaks and cracks everywhere, you better call the professionals. You can use cast iron repair paste or plumber's epoxy to fix holes or leaks.

How do you fix a crack in a cast iron sewer line?

So, you'll want to use a steel epoxy putty repair stick. What's that you ask? It's a polymer compound that when mixed, creates a super strong bonding agent that will fix any crack/leak/hole in any cast iron pipe.

How do you replace a cast iron sewer line?

4:0515:03How To Cut And Replace Cast Iron Pipe - YouTubeYouTubeStart of suggested clipEnd of suggested clipWe removed all of the old cast iron pipe in fittings. We're ready to install the new cast iron pipe.MoreWe removed all of the old cast iron pipe in fittings. We're ready to install the new cast iron pipe. So one thing to consider is always start from where the water is flowing to.

How do you repair a hole in a cast iron drain?

Use the putty knife to fill the hole with cast-iron patching compound. To do this, apply the compound around the pipe instead of along the pipe, and use just enough compound to seal the hole.

Can I use JB Weld on cast iron pipe?

J-B Weld FiberWeld Pipe Repair Cast When activated by water, the product forms a strong, waterproof bond that hardens like steel in 15 minutes. The kit includes an epoxy putty stick for additional sealing strength. Surface Applications: Copper, Cast Iron, PVC, ABS, Galvanized Steel, Rubber and more!

How do you seal a cast iron pipe joint?

Work the dampened compound into the joint a few inches at a time. Then tamp it down with a hammer and caulking iron. Continue adding and tamping the caulking a few inches at a time until the complete length has been packed into the joint.

Should I replace cast iron sewer pipe with PVC?

Durable – Polyvinyl Chloride can last up to 70 years or more. Replacing cast iron pipe is expensive as they deteriorate from oxidization. Cleaner – Because PVC doesn't corrode or rust, you won't get any metal in your sewage or drinking pipes. It's a non-toxic material, safe to use for all kinds of plumbing purposes.

How much does it cost to replace cast iron with PVC pipe?

Average Cost to Replace a Drain Line by Type of PipeTypePrice Per Foot30-Foot Project Cost*Cast Iron$10 – $20$375 – $900Polyvinyl Chloride (PVC)$0.50 – $5$19 – $225Copper$2 – $10$75 – $450Polypropylene (PP)$1 – $10$37.50 – $4501 more row•Jun 2, 2022

How do I convert cast iron plumbing to PVC pipe?

0:081:32Tie In to Cast-Iron Pipe With PVC - YouTubeYouTubeStart of suggested clipEnd of suggested clipHere's how first fabricate your PVC y fitting by gluing two short lengths of pipe on either endMoreHere's how first fabricate your PVC y fitting by gluing two short lengths of pipe on either end leaving enough exposed pipe to make the connection with the no hug fittings.

Can you fill a hole in cast iron?

There are several ideal methods that you could use to repair cast iron that does not require welding. Such techniques include brazing, the use of epoxy putty, and the use of cold metal stitching.

How do you fix a hole in a sewer line?

Answer: Two options for patching the hole in your drain trap are the Multi-Purpose Epoxy Putty, as you mentioned, and the Deluxe Pipe Patch Kit. Whether you use putty or a pipe patch will depend on how permanent you want to the solution to be. Putty is often used as a permanent solution.

Can you reline a cast iron pipe?

Relining cast iron drain pipes will join together any gaps and leaks on the pipe, thereby restoring it to its full-functional state.

What is the life expectancy of cast iron sewer pipe?

between 80-100 yearsCast Iron: Cast iron pipes last between 80-100 years, and are built to withstand a high amount of water pressure. However, like galvanized steel, cast iron piping has been found to be susceptible to rust over time.

What causes cast iron pipes to crack?

Old cast iron pipes with heavy rust buildup and corrosion will eventually develop hairline cracks, which are also subject to the ravages of time. Eventually, those hairline cracks become wider and longer, until eventually the pipes begin to leak or fail completely.

Can you use epoxy on cast iron?

Steel-reinforced epoxy, commonly known as liquid weld, works on cast iron. One example, J-B Weld Cold-Weld Steel Reinforced Epoxy with Hardener, costs $3.60 on Amazon.com for a package with one ounce of epoxy and one ounce of hardener.

What is plumber's epoxy?

Plumbers epoxy putty is a soft substance that is used to seal gaps and small leaks in certain types of plumbing pipes and around plumbing fixtures.

How much does trenchless sewer repair cost?

Trenchless sewer repair can cost anywhere between $4,000-$15,000 for the average single family home.

How long does a sewer repair project take?

Trenchless sewer repair can take as little as one day. Conventional sewer repair may last a week or more.

Will trenchless sewer repair destroy my home?

No. Trenchless sewer repair does not destroy your home. No trenches will need to be dug through your home or property.

What is your service area?

New Flow Plumbing provides sewer repair services to customers within a 20 mile radius of our office at 6718 Katherine Ave Van Nuys, CA 91405 includ...

How long does trenchless sewer repair last?

Trenchless sewer repair typically adds 50 – 100 years of life-use to your sewer lines.

Does it come with a warranty?

Yes. We provide a minimum 7-year parts and labor warranty on all sewer repair projects.

How long have you been in business?

We have been family-owned and operated for over 10 years.

Does trenchless sewer repair require a permit?

City requirements may vary. Please call for details.

What other services do you provide?

Besides trenchless sewer repair, we offer: Hydro-Jetting Sewer Camera Inspection Drain Cleaning Water Heaters Residential and Commercial Plumbing R...

Are you licensed and insured?

Yes. Our California State License Board (CSLB) number is 974766.

Why does my cast iron sewer line fail?

There are many reasons why your cast iron sewer pipes are beginning to fail. First off, all iron rusts when exposed to moisture or oxygen. Your sewer pipes are going to be constantly running waste and sewage, causing them to rust and corrode.

How to get sewer lines working again?

How to get your sewer pipes working again. 1. Hydro-jetting. Not long ago, clogged sewer lines were snaked using long, steel augers. With hydro-jetting, just as the name suggests, we use high pressurized water to clean out clogs. We can even remove small tree roots in the pipe.

What does it mean when your pipes are rusting?

Those roots will begin to reach and touch your pipes, even breaking inside them to cause problems. Here are a few things to watch out for that means your pipes are rusting and leaking. Odors that smell like sewage. Slow draining and clogging in your pipes. Mold growing on your walls or floors.

Can you replace cast iron pipes with PVC?

You may think that just replacing old pipes is the faster and cheaper solution to failing cast iron pipes. If you cut out a leaking or rusted section of pipe and replace it with PVC, you now have two ends that will leak soon. The cast iron on each side will continue to crumble or crack and break.

Can you repair sewer lines with trenchless methods?

Conventional sewer repair. Unfortunately, sometimes a sewer pipe is so badly damaged that no trenchless sewer repair is available. Pipes that are back-pitched, meaning the original contractors failed to use the right slope for your sewer line to your city connection, cannot also be fixed using trenchless methods.

What to do if cast iron pipe is failing?

If this is the case, you can easily make a repair. But if a cast-iron pipe is failing at several points, the most economical solution is to replace it with PVC pipe. This is a job for a professional.

How to clean a leaded joint?

Step 1: Clean Away Corrosion. If water or a bad smell comes from an old leaded joint, use a cold chisel and hammer to gently tap the lead back into the joint. Use a wire brush and rag to clean away the corrosion.

Can you disturb cast iron clamps?

Never disturb these clamps ; as if one weakens, a long section of pipe could come crashing down. Also, some older cast-iron joints were sealed with molten lead, but don't worry. This is not a danger to your health because only wastewater passes through the pipes.

Tools & Materials

To get started, you’ll need the following list of tools and materials. But keep in mind, before you make any purchases or rentals, the labor involved in excavating and repairing a sewer line pipe is heavy. Don’t attempt this unless you’re in good physical health.

1. Mark the Sewer Line

Begin by tracing the path of the sewer line from the main drain to the sewer or septic tank. Ask your local authorities for permission to work on the sewer pipe, and for information about its location and depth.

2. Reinforce the Trench

If the soil is loose or sandy, make the trench safe to work in by shoring its walls. Clay soil generally does not require shoring. Gravel soil requires shoring at the bottom only.

3. Brace the Trench Walls

Cut enough 2x4s, slightly longer than the width of the trench, to brace the walls every three or four feet. Mail each of the supports to the plywood sheets between waist and shoulder height. Leave enough space between braces to dig with a shovel.

4. Expose the Main Line (Sewer Line)

Because you likely won’t have access to (or the expertise to operate) a sewer line inspection camera, you will have to find the damaged pipe manually.

5. Prepare to Cut the Cast Iron Pipe

We’re at about the halfway mark in making the cast iron sewer pipe repair. Good job.

6. Cut the Cast Iron Pipe

Wearing your safety goggles, pump the handle of the ratchet back and forth to cut through the pipe. Loosen the adjusting knob, unlock the chain, slide the ratchet cutter to the other chalk mark and repeat the process.

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