I want to run a 1/2" copper water line to an adjacent basement room by tee-ing off the water line that leads to the kitchen upstairs. There's a gas line that would run parallel to the new water line most of the way and I'm wondering if there are any rules or rules of thumb on how to cross over/under the gas line.

The new line would tee off the copper and run to the room to the right in the picture. I'm trying to keep all pipes together and not hanging too low. The new line either crosses gas towards the camera early or crosses the gas line just before it reaches the new room because the gas line makes a 90 degree turn there AND there's an electrical junction box right there so I think I have to come out to the camera side of the gas line. All pipes already run under the joists so at this point I'm not going to worry about adding one more this way but it will need to eventually go up into and through the joist that defines the new room. Do I go upwards off the tee and bridge over the gas line and come back down to run under the joists or is it ok if the pipes touch as the copper pipes skims under the gas (not sure about metal corrosion from touching)? If it matters, I'm putting a threaded ball valve at the tee in case I want to easily remove the extra water line in the future. Thanks for any advice!

BTW- that big silver tube is just a hunk of open-ended conduit that I think the previous owners left to use for hanging up clothes.





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i would add the tee, then a copper shutoff with a pex adapter in it. then run pex to your destimation.
pex can go up/down or all around..

I expected to get a PEX recommendation. I tried the quick connect fittings and had a bad time trying to get them to not leak so I don't trust them. I travel too much to leave something I don't trust behind. And I don't have a crimper, never used one and don't want to invest in one. I know I can rent one but I was kind of hoping to stick with copper. Right now I'm worried about how it should interact with the gas line and whether there are some gotchas I'm not experienced enough to know about. Thanks, though!



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I would remove the upper existing 90* and insert a tee there. Run the new pipe off the tee, over the gas pipe and then 2 90*s to run parallel with the gas pipe.

Interesting thought about replacing the elbow with the tee rather than cutting into the pipe, makes sense. But instead of jumping under the gas line at the beginning valve end, I would do it just before it entered the new room because I have to use elbows to raise it to get into the center of the joist anyway. So it's parallel from the start and crosses when the gas takes a 90* turn towards the wall. I had a tough time de-soldering fittings before but I could try again and it would give me more space between the water and gas pipes. I'll look at it to see if the space would work with the ball valve and the electrical junction at the far end. Thanks!



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Just cut in a tee and roll it up on a 45, then a short piece of pipe and a 45 bend. That'll let you go over the gas line, add a couple 2 X 4 blocks between the joists to support the pipe.