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The Inspection Insider
Sometimes the smallest inspection finds are the ones homeowners should pay the most attention to.
This one started with a kitchen sink that drained normally.
No flood.
No puddle across the floor.
Just one small drip from a drain line that had been put back together without one very important step.
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🗂️ Inspection File: Missing Glue on a Sink Drain Line
I am under the kitchen sink, checking the drain line while running water through the sink. At first glance, the plumbing looks like it has been modified at some point, but nothing jumps out as a major concern.
Then I see it.
A small drip forms at one of the drain connections. Not a spray. Not a steady stream. Just a slow drip from a black ABS drain fitting where the pieces appear to have been pushed together, but not properly glued.
In plain English: someone changed the drain line, forgot the glue, and the connection was leaking.
This is the kind of leak that can go unnoticed for a long time.
🔩The Root Cause
Drain lines under sinks are often moved or modified when sinks, counters, dishwashers, garburators, or cabinets are replaced. The problem is that the plumbing can look “finished” even when one connection was not properly completed.
With black ABS drain pipe, the fittings are usually joined using the proper solvent cement. If a connection is only pushed together, it may hold its shape, but it may not stay watertight when water runs through the drain.
The expensive part is rarely the plumbing repair itself. The costly part is what happens if the leak continues: swollen cabinet floors, damaged shelving, stained finishes, hidden moisture, mold concerns, damaged flooring, and sometimes damage below the sink area.
A tiny drip can become a long-term moisture problem.
🛡️Next Steps
Look under your kitchen and bathroom sinks once in a while (monthly at least), especially after any plumbing work, countertop replacement, dishwasher work, or cabinet renovation.
Watch for staining, swelling, soft cabinet bottoms, musty smells, white residue, dark discoloration, or items stored under the sink that feel damp.
If you see active dripping, moisture damage, or plumbing that looks loose, incomplete, or recently modified, contact a qualified plumber for further evaluation and repair.
If there is staining, mold-like growth, or damage to the cabinet or surrounding materials, additional evaluation may be needed to determine how far the moisture has spread.
📈Prevention Tips
After any plumbing work under a sink, do not just ask, “Does it drain?”
Ask, “Was it checked for leaks while water was running?”
A quick look under the sink after the drain has been used can catch a small leak before it becomes a cabinet, flooring, or air-quality problem.
👀Worth a Look
Want to learn more about TOPIC?
- EPA — A Brief Guide to Mold, Moisture and Your Home
https://www.epa.gov/mold/brief-guide-mold-moisture-and-your-home
- CDC — Mold Clean Up Guidelines and Recommendations
https://www.cdc.gov/mold-health/about/clean-up.html
- Insurance Information Institute: Water Damage: What’s Covered, What’s Not
https://www.iii.org/press-release/water-damage-whats-covered-whats-not-111809
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⏭️ Next Time
Next time, we’ll look at a hidden exterior problem that can start as “just a little rot” but affect privacy, safety, pets, and even neighbor disputes.
Until next time,
Ron Henderson, CMI
Certified Master Inspector
Was this useful? Drop me a line at: [email protected]
Disclaimer: The Inspection Insider is an educational media publication. Content is based on general home inspection experience and real-world findings, and is intended to help homeowners understand what to watch for — not to assess, diagnose, or provide an opinion on any specific home or condition. Nothing published here constitutes a professional home inspection or should be treated as one. If you have concerns about your home, hire a qualified home inspector or licensed tradesperson to evaluate it in person.
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