Sewer odor and cast iron drain (C) Daniel FriedmanCast Iron Drain Piping Under-Floor Leak Diagnosis & Repair Case Study

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Cast iron drain pipes leak under a basement floor: this article describes Conrad's experience in tracking down a sewer gas odor that appeared in the building's (transite) heating ducts, finding a leaky sewer pipe under the basement floor, and repairing (or replacing) the in-floor cast iron plumbing drain waste vent piping, piping materials.

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Cast Iron Drain Pipe Leak & Repair Case - Odors Lead to Discovery of Under-Floor Drain Leaks

Sewer odor and cast iron drain (C) Daniel FriedmanThe articles at this website will answer most questions about water supply & drain piping, wells, & water tanks as well as many other building plumbing system inspection or defect topics. Reproduction of this web page electronically at other websites is prohibited.

Leaky Cast Iron Drain Pipes Under a Floor Slab Send Sewer Gases into HVAC Ducts

A reader (Conrad) provided us with the photographs and case history of the successful track-down of sewer gas odors in a building (SEWER GAS ODORS). The case began with a complaint of sewer gas odors in the building's heating duct work system. As you can see from the "before" and "after" photos, this case involved the following combination of circumstances:

  • A transite heating duct was buried in a basement floor (below the slab) and located parallel to and immediately above a cast iron sewer pipe (photo below left)
  • The sewer pipe deteriorated and developed leaks (photo below right)
  • The transite (asbestos cement - see TRANSITE PIPE AIR DUCTS) air duct was also leaky
  • Sewer gases leaked out of the cast iron waste line and into the heating duct line.
  • The repair required breaking up the concrete floor slab and replacing the leaky sewer line. We recommended replacement of the transite heating duct as well.

Photographs of Finding, Excavating & Diagnosing Transite Duct & Cast Iron Drains Buried Under the Basement Slab

Sewer odor and cast iron drain (C) Daniel Friedman Sewer odor and cast iron drain (C) Daniel Friedman

The photo at below left shows the basement floor slab cut open to permit replacement of the leaky cast iron drain line. At below right our final photograph shows the new white PVC drain piping installed in the floor.

Sewer odor and cast iron drain (C) Daniel Friedman Sewer odor and cast iron drain (C) Daniel Friedman

Photos of Repairs to the Leaky Cast Iron in-Slab Drain Lines

At above right and in more photographs below we show the sewer line break repairs and floor re-tiled kindly sent along by reader Conrad.

Sewer odor and cast iron drain (C) Daniel Friedman Sewer odor and cast iron drain (C) Daniel Friedman

Also see CAST IRON DRAIN PIPING. Other types of building piping systems are discussed at GAS PIPING, VALVES, CONTROLS and at OIL TANK PIPING DEFECTS. or select a topic from the More Reading links shown below.

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