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Old 10-19-2011, 02:18 AM   #1
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How should i repair this cast iron drain leak?


The house i own is 80 years old and has a cast iron drain with a leak. I'm not working at the moment, so i was hoping this is something i could repair myself. Could you tell what is the best way to repair this leak and is this something i could do myself?

I appreciate any help you can offer me and i will post photos too.
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Old 10-19-2011, 05:42 AM   #2
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How should i repair this cast iron drain leak?


Are you O.K. with opening up the concrete?

I suggest opening the slab up enough to replace the two two Ts and the riser pipes with PVC.

Supporting the over head piping when removing the risers is very important.

A chain breaker can be rented for $25--or less and will cut that pipe quickly and clean.

I think this is a job that can be done by a novice if you get the right guidance.--Mike--

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Old 10-19-2011, 06:34 AM   #3
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How should i repair this cast iron drain leak?


Thank you Oh'Mike for taking the time to reply to my question.

How would i go about opening up the concrete and what tools would i need?

I know what you mean but the 2 T,s, but what are the riser pipes? (the 2 pipes above the T's?)

How would you recommend i support the over head pipe when removing the risers?

I have a sawzall, but would you recommend the chain breaker over it?

Again thanks,
Mark
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Old 10-19-2011, 06:41 AM   #4
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How should i repair this cast iron drain leak?


You could rent an electric jack hammer or a large chipping hammer.

To support the over head pipe work I'd use perforated pipe strap and screws--it's sold by the roll.

Forget the Sawsall---cast iron is murder on blades--you will spend more on blades than rental--

Whenever you work on really old piping it is best to replace as much as you can--so cutting the riser pipes close to the overhead just makes sense.
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Old 10-19-2011, 06:51 AM   #5
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How should i repair this cast iron drain leak?


Oh'Mike when you say to cut the riser pipes close to the overhead.

Do you mean cut the long pipe over the T's?

Would you cut over the hubs on the last photo i posted, which are on the long lengths of pipes? (how far should i go in the last photo i posted?)

Thanks again,
Mark
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Old 10-19-2011, 07:00 AM   #6
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How should i repair this cast iron drain leak?


I'd cut the pipes about 8" below the hub---that will give you plenty of room for a rubber Fernco type coupling.
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Old 10-19-2011, 07:02 AM   #7
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How should i repair this cast iron drain leak?


Quote:
Originally Posted by markcal02 View Post
Oh'Mike when you say to cut the riser pipes close to the overhead.

Do you mean cut the long pipe over the T's?


Thanks again,
Mark
YES---
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Old 10-19-2011, 07:05 AM   #8
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How should i repair this cast iron drain leak?


Would the cast iron drain be the same size as the PVC, so using a rubber Fernco type coupling will match up and be straight forward?

I appreciate your advice and helping me out!

Take care,
Mark

Last edited by markcal02; 10-19-2011 at 07:09 AM.
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Old 10-19-2011, 07:21 AM   #9
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How should i repair this cast iron drain leak?


Yes--it's done all the time--

Just make sure that you clean off as much rust as you can so the Fernco can get a good seal.
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Old 10-19-2011, 09:26 AM   #10
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How should i repair this cast iron drain leak?


Just for putting in my own $.02 . . . .

I'd replace the piping all the way up to the wyes that are in the vertical there. In order to do that you CAN actually break those cast iron hubs with a 3 LB sledge hammer (and a little muscle) which will allow you to connect your new piping directly to the bottom of the fitting rather than having a connection right below the existing hub. If you're more comfortable leaving the hub there and using the chain cutter instead, that is perfectly acceptable.

NOTE : when you go to buy galvanized plumber's tape, please shop around for a decent roll. The stuff that HD sells is garbage. It works ok for supporting ABS piping, but i'm not sure i'd trust it to hold up all that cast iron over my head while i'm working. There are a few different thicknesses of the stuff, and I can't recall what we use off the top of my head.

For cast iron -> PVC or ABS connections we usually use no-hub couplings.
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Old 10-19-2011, 05:08 PM   #11
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How should i repair this cast iron drain leak?


I wouldnt use pipe strap and screws to hold the stack up. Rather I would use friction/riser clamps and brace the clamp to something sturdy.

http://www.askmehelpdesk.com/plumbin...ce-510255.html

Last edited by jc60618; 10-19-2011 at 05:14 PM.
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Old 10-19-2011, 05:56 PM   #12
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How should i repair this cast iron drain leak?


Both of the above suggestions are good ones-----
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Old 10-20-2011, 06:44 AM   #13
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How should i repair this cast iron drain leak?


2cents, All the information is great I just want to mention how I would support the vertical double stacks. I would buy two heavy riser clamps and put them under the two hubs and bolt through allthread up to the overhead joists with clamps drilled through the joists, tighten everything up secure then start demolition on the two stacks and underground.

Oh! Make sure the water's off and nobody's home that day.
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Old 10-20-2011, 02:16 PM   #14
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How should i repair this cast iron drain leak?


I know this is a DIY form.
That being said if you are not 100% sure of your self, you may want to get some help on this one.
When you remove the bottom vertical part of those cast iron pipes , everything above them is going to want to come crashing down.
It would not be a pretty site.
If you go for it yourself, take the time to properly support everything above where your going to cut.
If those pipes even only move a small amount you could have leaks through out the drain system.

Good Luck.
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Old 10-20-2011, 05:03 PM   #15
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How should i repair this cast iron drain leak?


Quote:
Originally Posted by AlbacoreShuffle View Post
I know this is a DIY form.
That being said if you are not 100% sure of your self, you may want to get some help on this one.
When you remove the bottom vertical part of those cast iron pipes , everything above them is going to want to come crashing down.
It would not be a pretty site.
If you go for it yourself, take the time to properly support everything above where your going to cut.
If those pipes even only move a small amount you could have leaks through out the drain system.

Good Luck.

Did you even see post #13 ?

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