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Author:
Palm329 (VA)
Dug up a 3" cast iron drain pipe in my basement. Vertical portion looks okay but the horizontal pipe has what I can only describe as bumps or lumps on the outside.
I broke one off and I see what appears to be normal cast iron pipe underneath.
Is this some sort of decay or is it just the result of being in contact with damp soil for 60 years?
Can I safely tie into this cast iron using a couple mission/Fernco couplings? I'll have to smooth off the outside I guess of lumps in order to slide the fitting on.
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Author:
steve (CA)
Normal. Clean and clamp it.
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Author:
packy (MA)
i would use a cast iron fitting to tie into the old cast. you can transition to plactic from there. it is actually required under my code.
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Author:
Palm329 (VA)
Thanks!
Packy- luckily I don't live in mass anymore...
But just to clarify, from this point "up" as in the stack all the way thru the roof, plus all arms up there to fixtures, everything is already pvc. So even in mass doing the transition to pvc underground with a banded no hub would pass code right? You just can't shove a piece of pvc in the middle of a run of ci, for obvious reasons...
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Author:
packy (MA)
if the pipe is transitioned at that point and is PVC all the way, even Massachusetts most hard hearted inspector could not flunk what you describe.
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Author:
ravi102769 (VA)
The lumps are probably the Bituminous coating that is put on during the manufacturing process to prevent rust. The underground pipe would be hub and spigot pipe which because the joints were caulked they didn't worry about having drips hanging off.
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Author:
Palm329 (VA)
Here's the final result:
Turns out the horizontal was actually 4", so I installed the test-T, brought it down 3", into a "doughnut/flush-hub" thing to convert to 4", then 4" long sweep 90, to a 3" Y (future basement bathroom), then a 4" no hub mission coupling.
No leaks so far. Test T down was today, the whole stack upward was last year. I know you guys love your cast iron, but as a homeowner you guys can enjoy melting lead and packing, I'll just glue things haha
Thanks for everyone's help!
Edited 1 times.
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Author:
packy (MA)
fine sand 6 inches in all directions of the plastic pipe when backfilling.
it really looks terrific...
good job...
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Author:
Palm329 (VA)
Thanks!
One last question, when the floor gets concreted again, right up to pvc or do I need to leave an expansion gap?
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Author:
Palm329 (VA)
No to which?
No, don't concrete right up on it, or no, no need for expansion gap?
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Author:
packy (MA)
no gap required. they do want a sleeve around pvc when coming in thru a foundation so the pipe will withstand a small amount of settling.
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