How to unsolder and extend this short Cu pipe?

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TomNH

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Looking for clever tricks for short pipe work:

The builders ran 3/4" copper pipes back and forth from the unfinished attic to the basement for hydronic heating. I need to connect these to the boiler, but one run is only sticking out of the unfinished basement ceiling an inch or so, and it has a cap soldered onto it. I can't pull the pipe down at all. Above the OSB subfloor it's poking through is a 2x4 wall between two rooms, so I can't really cut away much of that to get better access.

Does anyone have any tips for soldering with such a small pipe length?

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I would not risk it. That is too close to the OSB and the other wood above it.

Cut into the wall above, and extend the piping. A little bit of drywall isn't worth burning your house down.
 
Great idea, that's much simpler and safer. Thanks!
 
I would attempt it..not attempt, i would do it ;)

you need a piece of sheet metal. with a slot cut into to it as a flame guard.
next. drill a hole in the cap. to let out any water that is trapped.
heat the cap, by directing the flame away from the wood.
remove cap. extend cap.

this is not a diy job. this is a job for an experienced plumber.

it can be done.

have a fire extinguisher available during any hot work
 
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get a pro. Not a DIY. make sure they are bonded and insured so you're covered if they do burn your house down.

Open the wall above is your safest way.

Did a similar repair BUT this was on a horizontal wall. big DIF.

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