patrick0042
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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 pipe and retrofit by running 3.5" PVC through existing hole and using reducers at each end to unite remaining waste pipe?? Otherwise, is core drilling the only way to remove pipe/enlarge hole to fit 4" piping to match? -- Desperate for solutions. thanks!