A Silver Spring home inspection flagged an 80+ year old cast iron sewer line with both cleanouts sealed shut. Here's how to think about sewer line replacement versus a new cleanout.
The question
A home inspection report said the main sewer line was original cast iron, more than 80 years old and past its life expectancy. The sewer scope, which is a camera inspection of the line, couldn't be finished because both cleanouts were sealed shut. The report called for a licensed plumber to either replace the main sewer line, or install a new cleanout, complete a full sewer scope and make any repairs needed.
What's going on
Cast iron was a common sewer pipe in older homes. Over the decades it can corrode from the inside, crack or let tree roots in, but age alone doesn't show the condition of a particular line. A sewer camera does, and it needs a way in. A cleanout is that access point: a capped fitting that opens into the drain line. When cleanouts are sealed shut, the camera has no easy route. Installing a new cleanout restores access, and a full sewer scope can then show whether the line needs a repair or full replacement. Replacing the line right away settles the question of the old pipe without a camera inspection, but it's a much bigger job, so it helps to know what the line actually needs.
What we recommended
- Look at any inspection pictures first, because the written finding covered a different scope from what was first discussed.
- Evaluate the line in person before settling the scope.
- Have the crew take pictures on site so we can explain what's there to the customer.
Tips for Silver Spring homeowners
- If a home inspection says a sewer scope couldn't be completed, treat the line's condition as unknown, not as a pass.
- Buying or selling an older Silver Spring home? Have the sewer line looked at early, so there's time to open or add a cleanout and finish the camera inspection.
- Ask whether a new cleanout and sewer camera inspection make sense before committing to full sewer line replacement. The footage shows what the line actually needs.
- Ask to see the camera footage or pictures so you can understand the recommendation for yourself.
- Watch for signs of main sewer line trouble: several drains running slowly at once, backups at the lowest fixture in the house, gurgling drains or a sewage smell.
- Find out where your sewer cleanouts are and whether they open. A sealed cleanout is no help when you need a line cleared.