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Inspector using a thermal camera to check for moisture near a window with visible staining; landscape grading appears to slope toward the home.

What We Look For (And What We Don’t): Signs of Active Leaks — What Triggers a Concern

Leaks rarely announce themselves with a dramatic ceiling collapse. Most of the time, they whisper—through subtle stains, swollen trim, soft drywall, or weird thermal camera patterns that say, “Water’s been here.”

And that’s what I’m trained to look for. Not just puddles on the floor, but the symptoms that suggest a slow leak is happening behind the scenes. Because by the time water is visibly dripping, the real damage is already done.

What Triggers Concern During a Home Inspection?

I’m constantly evaluating the entire property for water intrusion risk. That includes:

  • Grading issues: If the yard slopes toward the house instead of away from it, it’s like a welcome sign for water intrusion into the foundation or basement.
  • Unsealed penetrations: Gaps around plumbing, wiring, HVAC lines, dryer vents, and even cable boxes—if not sealed—let water and pests in.
  • Window and door flashing: If improperly installed or deteriorated, rainwater can slip behind siding or framing. Look for bubbling paint, soft drywall, or rusty metal corners.
  • Staining or discoloration: I’m trained to recognize water stains even after they’ve been painted over. (Yes, there’s a difference in texture, sheen, and absorption.)
  • Thermal anomalies: A thermal camera can detect cooler or warmer spots than expected—often indicating moisture behind the wall, especially if it’s rained within 24 hours.

Where We Find the Most Leaks

Leaks aren’t just a roof thing. I’ve found water intrusion in some of the most common (and surprising) spots:

  • Below windows and doors
  • Basements or crawlspaces with poor drainage
  • Bathrooms with unsealed tubs or tile grout
  • Attics with old flashing or missing shingles
  • Inside garages where grading slopes inward

And sometimes it’s not a leak—yet. It’s a condition that’s practically begging to become one. Like that HVAC line entering the home with a 1" gap around it, or that flower bed you lovingly built that now holds water against the siding. I’ll call that out before it causes trouble.

What I’m Looking For—And What I’m Not

  • ✅ I’m looking for: visible damage, water stains, thermal anomalies, and entry points where water could get in.
  • ❌ I’m not: performing moisture meter readings behind every wall, or predicting future leaks with certainty. This is a visual inspection—not a waterproofing guarantee.

What Happens Next?

If I flag active or suspicious leaks, here’s what I recommend:

  • Get a contractor or roofer to evaluate and possibly open the wall or ceiling.
  • Check the grading and downspout placement—simple fixes often prevent big damage.
  • If thermal imaging suggests a problem, verify with a moisture meter or invasive testing (beyond inspection scope).

FAQs: Active Leaks During Home Inspections

Can you confirm if a wall has a leak?

We can identify signs and patterns that suggest moisture, but we don’t cut walls open. Thermal cameras help, but confirmation often requires further testing.

What are the biggest causes of water intrusion?

Poor grading, unsealed exterior penetrations, damaged roofing or flashing, and deferred maintenance. Water always takes the easiest path in.

Why do some leaks go unnoticed for so long?

They often start small—like a slow drip behind drywall. By the time you see stains, warping, or paint bubbling, water has likely been there for weeks or months.

Can leaks be hidden even if the inspection finds nothing?

Yes. We only evaluate what we can see. If a leak is behind finished walls or ceilings and hasn’t caused visible symptoms yet, it may go undetected without invasive testing.

→ Next up: Post 40: Why You Should Attend Your Home Inspection Walkthrough

← Previously: Post 38: Potential Mold — What We Can Say (and What We Can’t)

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