Drain pipe rotted under house, can someone look over my repair plan?

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Tireshark

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I have a section of cast iron drain pipe that rotted out right under the middle of the house... im going to cut at each end of the house and replace with PVC, probably about 25 feet.

Wanted to install a clean out plug back at the sink, and possibly one right before it goes into the 4" sewer drain. I can do that with wye pieces right? Will use fernco couplers to join pvc to the cast iron. Here is a rough diagram, just wanted someone to check it out in case i missed something, or if there is an easier way to do it.

The #1 wye is the one i will for sure install, the #2 wye is optional because i dont know if it's really necessary (although i imagine the more clean out spots the better?).

http://i.imgur.com/ugOiTLz.png

Thanks!

p.s. i just realized i will probably need to tie the washer drain into this... so i will probably just use another wye to make that connection somewhere in the middle.
 

hj

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"Ferncos" are not the way to go, even though they are easier to use. Unless you have a deep crawl space or easy access to them, cleanouts in a crawl space are useless.
 

Tireshark

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There is about a foot or more of crawl space, and it is relatively easy to get to. I've used the cleanout successfully for clogs in the past.

""Ferncos" are not the way to go"

So then what's your alternative?
 

Terry

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There is about a foot or more of crawl space, and it is relatively easy to get to. I've used the cleanout successfully for clogs in the past.

""Ferncos" are not the way to go"

So then what's your alternative?

mission_bandseal.jpg


A metal wrapped coupling to prevent pipe shift. Working with cast, it's very important that you prevent sagging at the fittings.
I would try to measure the OD of the cast. Some cast is smaller than plastic, and they do make fittings for that.
One side is for plastic, the other may be for cast or copper. I sometimes use a coupling for copper if the OD is something like 3-1/8"
 

Tireshark

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Thanks Terry, i picked up a couple of those metal wrapped couplings.
 
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Tireshark

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Well, all things considered i guess it went pretty smooth. Was a pain to cut all the cast iron and drag it out... was much heavier than i thought it would be. Took out about 25 feet:

http://i.imgur.com/g1gxhqB.jpg

When i got it out i saw that nearly every section was rotted, and probably had been that way for a long time:

http://i.imgur.com/eS70IU9.jpg

so i ended up taking all of it out that i could get to. The only thing i left was this short section that goes into the main sewer connection:

http://i.imgur.com/guZvrYJ.jpg

I figured that might be a nightmare for me to try and get it out of that wye, so i just dug out all around the pipe and made sure it felt solid, so hopefully it will last. If not, it's right next to the crawl space entrance and there's a good bit of room so it should be easy to reach for whoever replaces it... whether its me or the pros.

I went ahead and put a cleanout connection there...

http://i.imgur.com/53i4IBk.jpg

might be overkill since i put one the other end as well

http://i.imgur.com/FuaXEox.jpg

but i figured i might as well because you never know when it might come in handy. otherwise i'd have to be crawling all the way back to the other one, or digging up the cleanout spot outside the house.

The biggest thing im concerned about at the moment is how ticked off my cousin is going to be if she finds out i took her brand new pink toolbag, that is supposed to stay under the kitchen sink, and dragged it through wet rotten mud.

http://i.imgur.com/u6aPjtR.jpg :eek:

Hope that pink washes clean. :D
 

Terry

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All back together. Good
On plastic, they like to see support every four feet to prevent sagging. Supports on cast can be farther apart.
What kind of glue was that?
 

Tireshark

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Ok thanks, i will make sure its supported.

It was the oatey orange medium stuff... it was about a year old and was pretty gummy. i had bought a new can of it, but it had a dent in it and when i opened it up it was rock solid... so i just used what was left out of my old can.
 
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