Hi!

I am experiencing slow drainage in my main sewer and a plummer told me there are roots in the system.
I dug a trench to locate the main sewer, which I found.

It consists of 2 feet of 4" cast iron pipe that is then connected to concrete like pipes that are about 5.5 inches thick in diameter and about 3 feet a piece. At each connection, several roots enter the poor connections. I intend on replacing about 15 feet of the concrete pipe with PVC from the Cast Iron and then I have to connect the PVC with the concrete where there are no more roots.

How do I connect the 4 inch PVC into the Concrete pipe?

How do I cut concrete pipe?

I have figured out the Cast Iron to PVC - will connect using No-Hub Clamps, and I will use a Snap Cutter for the CI.

Thanks for any advice.
Pictures are

Quote:

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Originally Posted by fcandreasson

Hi!

I am experiencing slow drainage in my main sewer and a plummer told me there are roots in the system.
I dug a trench to locate the main sewer, which I found.

It consists of 2 feet of 4" cast iron pipe that is then connected to concrete like pipes that are about 5.5 inches thick in diameter and about 3 feet a piece. At each connection, several roots enter the poor connections. I intend on replacing about 15 feet of the concrete pipe with PVC from the Cast Iron and then I have to connect the PVC with the concrete where there are no more roots.

How do I connect the 4 inch PVC into the Concrete pipe?

How do I cut concrete pipe?

I have figured out the Cast Iron to PVC - will connect using No-Hub Clamps, and I will use a Snap Cutter for the CI.

Thanks for any advice.
Pictures are

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I would suggest that you NOT use a snap cutter on old CI pipe in the trench..

See this thread for my recent saga, wherein I shattered the CI pipe:
https://www.askmehelpdesk.com/plumbi...pe-107834.html

Instead, use a diamond blade in a grinder. Even buying a cheap grinder and the blade shouldn't run you much more than a day's rental on a snap cutter. Bonus is that the blade will cut just about anything, including concrete. Since you only have one cut to make on the concrete, you probably won't need to rent a large gas-powered cutoff saw, but they're available and work well outside.

For the connection, you could use an offset coupling: Fernco, Inc.

I don't know if this is rated for burial though.