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Took your recommendations to stick with 4" piping. Rather than chisel, rented ($70) a chipping hammer which melted the concrete like butter, easily loosening the existing cast iron and also allowing me to slightly enlarge the hole so that I can pass the thicker walled 4" PVC through. Worked like...

Thank you, Gary and Jim That's what I was afraid of...not OK to reduce a waste pipe. Time to earn some of that sweat equity!

My home's cast iron 4" gravity waste pipe fractured comletely off at interior edge of 15" thick foundation wall. A second complete fracture exists 9" outside foundation. Pipe is strongly bonded to foundation concrete, and the concrete is over 50 years old. Is it acceptable to descale interior of...