How To Look At A House
McGarry and Madsen's home inspection blog for buyers of
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When did they stop using cast iron pipe in houses?
Saturday, February 29, 2020
Cast iron was used extensively for DWV (drain-waste-vent) piping until the mid-1970s, when PVC pipe became widely available and accepted by plumbers. Corrosion was the main problem. It is still an available and approved pipe in the building codes, and used for repair of cast iron pipe systems systems, although PVC is used more often for repairs of sections of cast iron that have gone bad. It is recognizable by the extra-wide hub at pipe connections.
Here’s a decade-by-decade listing of the common types of pipes used:
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