Hammond Re-Engineered DIY Guides · No. 5
Diagnose a Ceiling Leak
It's Never Where It Drips
A water stain on the ceiling is almost never above where it shows. This book walks the four possible sources and the tracing technique that finds the actual leak before you cut the wrong drywall.
About This Guide
The stain is not where the leak is.
Water travels. It runs along the top of a ceiling joist, across a rafter bay, down the face of a duct — and shows up as a drip, a stain, or a bulge in the ceiling somewhere that isn't directly below the source. Homeowners who cut drywall open at the visible stain almost always find nothing. The real leak is three feet away, ten feet away, or in a different room entirely.
This book walks the diagnostic method that finds the actual source:
- The four possible categories of ceiling leak, ranked by
- probability.
- The first twenty minutes — protect the rest of the house,
- contain damage, kill electrical if needed.
- The inspection pass through the room above the stain.
- Tracing the path water took to reach the drip.
- Plumbing vs. roof vs. HVAC vs. "other" — how to tell them
- apart before you open the ceiling.
- When to open drywall, where, and how much.
- Fix-or-hire decisions for each category.
- Drying, repair, and verification.
Written for the homeowner who'd rather spend an hour diagnosing than spend the afternoon patching a hole that didn't solve the problem.
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