Replacing cast iron drain pipe????

red_ryder · #1 Oct 9, 2006, 06:53 PM

Put in a dishwasher and was working on the drain when i noticed the 2" cast iron drain pipe wasnt in very good shape. I spliced it with a sawzall ans the put pvc in and tried to use a boot on each end but it still leaks. Then from the cutting another joint in it started to leak. Ive decided its time to replace it with pvc. My dishwasher will feed into it along with my washer and kitchen sink. So i have a couple of questions.
1) Should I replace with 2" pvc or shoudl i go to 3" pvc?
2) my plan is to replace with the cast iron with pvc all the way back to 4 inches or so from the main drain. The joint for the cast iron appears to be leaded in and i dont want to mess with that. So my question is what do i do with the place the pvc meets the cast iron? I thought about a boot but cant find one that fits. I would need a 2' to 21/4 " or something like that. Any help is greatly appreciated.

red_ryder · Oct 11, 2006, 05:08 AM

Wanted to start by saying this site is very helpful. Thanks to all who participate. As my thread above states i replaced a 2" cast iron drain pipe with pvc. I then noticed i have no vent at all. So i have an upstairs bathroom and sink. Downstairs i have a dishwasher, washer, 2 sinks, toilet, bathtub. Woould one drain pipe suffice for everything? If not how many should I have? Also could i just splice the upstairs sink drain and take it on outside for a vent? and finally is 3/4 drain pipe big enough for a dishwasher drain ?

red_ryder · Oct 12, 2006, 03:04 AM

I mean the whole house has no vent. So upstairs i have a toilet that has 5" pvc that runs to the 5" main in the basement. The upstairs sink has 1 1/2" pvc that connects to main in basement close to the connection for the upstairs toilet. Down stairs the tub drain is cast down to the main and the toilet is also cast 5" to main. The sink is 1 1/2" pvc to main. Then there is the dishwasher, kitchen sink and washer which al connect to a 2" pvc pipe that connects to the main at a higher level than the rest. Would splicing the upstairs sink and extending it outside be enough or should i vent the 25' 2 inch pvc as well?

Also the dishwasher is in an island with an electric range. I have ran 1/2" cpvc for the hot water connection. I also have a 3/4 inch barbed connection for the dishwasher drain. Its 3/4" pvc for about 3' and then it hits the 2" pvc drain.



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