Connect plastic drain pipe to old cast iron
Posted by Rebecca Caldwell on December 16, 1999 at 00:26:32:
I,m disconnecting old cast iron pipes to enlarge a small bathroom built over a concrete slab (about 6 inches
between the slab and floor joists). What is the best way to unsolder the lead joints in the iron pipe?
A small propane torch doesn't heat up the mass nearly enough to melt the lead and loosen the joint.
Do I need to get a oxy/acetylene cutting torch to be able to apply enough heat? Also is there any way
to wick the lead out of the joint once it is melted? Then what is the best way to connect the plastic
piping to the remaining waste line that runs underground to the street? Any tips are greatly appreciated.

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