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Old 01-28-2011, 04:07 PM   #1
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A few Q's about replacing old plumbing


I am about to start replacing some old galvanized plumbing under my house. There are 4 supply lines coming out of the ground in line with each other. They are all within about 6 feet of each other. 3 of the lines go straight up into one bathroom, going to the tub, sink, and toilet. The 4th line serves the rest of the house (one more bathroom and a kitchen) and goes to the water heater. 2 of these lines are encased in a big black outer pipe, that I believe is just insulation, but looks about like cast iron. This black pipe runs down into the dirt.

My questions are, is this common and acceptable? Why would only 2 lines (the middle two) be insulated? Can I just cut off the first 3 supply lines and hook everything up to one supply?

Thanks for the help.

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Old 01-28-2011, 06:19 PM   #2
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A few Q's about replacing old plumbing


I believe the (2) lines you refer to as being insulated are actually outgoing lines. That would be cast iron which was common to use a waste piping back in the day, say when my daddy was say my sons age.

Good luck on the project, sounds like you gots lots to learn.

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Old 01-28-2011, 06:42 PM   #3
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A few Q's about replacing old plumbing


Pictures would really be helpful. Answering your question would be irresponsible at this time.
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Old 01-29-2011, 06:34 PM   #4
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A few Q's about replacing old plumbing


Ok, here are some pictures. I labeled the pipes for you.







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Old 01-29-2011, 09:08 PM   #5
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A few Q's about replacing old plumbing


Its still real hard making it out that piping callogue by it looks like 1&2 and maybe 4 are supply (not real sure why there would be 3 supplies), 3 looks like a support for the branch pipe.

The ? looks like it might be gas, if there is gas piped into your place.

But it is still a guess, one thing for sure is the cast iron is definately waste piping.
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Old 01-29-2011, 09:31 PM   #6
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A few Q's about replacing old plumbing


Neat photos - resembles my current old plumbing. I'm curious is #3 just welded externally to the relatively diagonal cast iron drain line above it, but not actually internally a T connection to that piece? Or does #3 actually drain into pipes under the foundation?
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Old 01-30-2011, 07:53 AM   #7
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A few Q's about replacing old plumbing


The so called insulation on the pipes is doing nothing for insulation factor, the first thing I would do is clean all that piping off to get a clear picture of everything then start tracing and labeling and replacing then re-insulating. It's always better to have a clean slate to start from.
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Old 01-30-2011, 06:57 PM   #8
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A few Q's about replacing old plumbing


Pipe number 3 is not a drain line or a support. It is a supply just like number 2. I just did not see the need to post a separate pic of it. Has anyone ever seen this type of pipe? Should I just cap the 1st 3 pipes and run everything from #4?
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Old 01-30-2011, 09:06 PM   #9
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A few Q's about replacing old plumbing


Don't know Fisher, you are there, I would love to be of better assistance on this one, but I don't think I have ever seen that many pipes supplying (1) house.

If they are all supply, where are the shut-off valves?

Good luck on this one, I have to go with Coldiron on this one, just have to clean up that mess, and trace all the lines out so you know exactly where and what they are doing.

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Old 01-30-2011, 10:22 PM   #10
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A few Q's about replacing old plumbing


Could #2 be gas? (in the photo the 90 degree elbow in the broken insulation looks black, and maybe that's why they chose black insulation/wrap to signify that ). I have capped unused iron pipes in my home that are left behind from a time when the gas meter was in my garage.

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