Cast Iron Drain Piping Under-Floor Leak Diagnosis & Repair
CAST IRON DRAIN LEAK, ODOR, REPAIR - CONTENTS: Cast Iron Drain Pipe Leak & Repair Case - Odors Lead to Discovery of Under-Floor Drain Leaks. Diagnose & repair cast iron drain connection & leak problems. Diagnose sewer gas odors traced to cast iron drain deterioration. Types of leaks occurring in cast iron drain piping.
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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.
Cast Iron Drain Pipe Leak & Repair Case - Odors Lead to Discovery of Under-Floor Drain Leaks
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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)
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
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.
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.
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Questions & answers or comments about how sewer odors are traced, and how to diagnose & find leaky buried cast iron drain pipes and how to trace methane odors to a nearby HVAC duct in the floor slab.
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Thanks to reader Conrad for discussing an under-slab sewer gas odor source traced to a combination of transite heating ducts in the floor slab and leaky cast iron drain piping - January 2010
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