When most homeowners think of a roof inspection, they picture a guy on a ladder. That’s part of it. It’s not the whole picture.
A modern, thorough inspection uses three different tools because each one catches issues the others miss. Here’s what each tool does well, what it doesn’t, and why a real inspection includes all three.
Tool 1: Drone Imagery
A drone equipped with a high-resolution camera flies a programmed path over the roof, capturing imagery of every slope, ridge, valley, and penetration.
What drone catches well
- Overall roof condition at a glance. Color variation, granule loss patterns, moss colonization, ridge alignment.
- Hard-to-reach areas. Steep pitches, multi-story homes, roofs over decks or unfenced areas.
- Pattern recognition. Wind damage often follows directional patterns that are obvious from above and invisible from a ladder.
- Documentation. The imagery becomes part of the inspection record. You see what we saw.
What drone doesn’t catch
- Tactile condition. Soft spots in the decking aren’t visible from above. They’re felt underfoot.
- Detailed flashing inspection. A drone can see that flashing exists. It can’t tell you if the sealant is still bonded.
- Underside problems. Anything happening in the attic, under the deck, or behind the fascia is invisible from above.
Drone is a powerful diagnostic, but it’s a survey tool, not a complete inspection.
Tool 2: Walked Inspection (When Safe)
A trained roofer walks the roof, inspecting flashing details, ridge caps, vent boots, and penetrations up close.
What walked inspection catches well
- Soft spots in the deck. Felt underfoot, not visible from above.
- Sealant condition. Up-close inspection of caulking and bonding.
- Vent boot condition. Cracking, lifting, hardening of rubber gaskets.
- Ridge cap and hip details. Cap nail exposure, sealant wear.
- Flashing engagement. Whether step flashing is properly woven into the siding.
- Granule loss assessment. Picking up loose granules to evaluate end-of-life severity.
What walked inspection doesn’t catch
- Issues invisible from the surface. Anything happening below the underlayment or in the attic.
- Steep or wet roofs. Some roofs are too dangerous to walk safely.
- Pattern overview. Hard to see the whole roof at once from on top of it.
Walked inspection is the second-most-important tool, and the one most general home inspectors skip.
Tool 3: Attic Inspection With Thermal Imaging
Inside the attic, a roofer with a thermal camera looks for moisture telltales that are invisible from outside.
What attic inspection catches that nothing else can
- Active leaks in progress. Water that hasn’t reached the ceiling yet shows up on rafters and underlayment first.
- Hidden moisture. Thermal cameras detect temperature differentials that indicate wet insulation or wet decking, often before visible damage develops.
- Ventilation problems. Compressed insulation around exhaust vents, blocked soffit intakes, mold growth from inadequate airflow.
- Rafter and truss condition. Structural issues, prior repairs, sagging.
- Daylight through the deck. Active leak paths that are tiny but real.
This is the single most underrated step in a roof inspection. Half the problems we find on Snohomish County homes show up in the attic before they show up on the roof surface.
What attic inspection doesn’t catch
- The roof surface itself. The deck and underlayment hide what’s happening above.
Why a Real Inspection Uses All Three
Each tool catches a different category of problem:
| Issue type | Drone | Walked | Attic |
|---|---|---|---|
| Overall condition | ✓ | partial | — |
| Flashing details | partial | ✓ | — |
| Vent boot condition | partial | ✓ | — |
| Soft decking | — | ✓ | partial |
| Active leaks | — | — | ✓ |
| Moisture infiltration | — | — | ✓ |
| Ventilation problems | — | — | ✓ |
| Structural concerns | — | partial | ✓ |
| Wind damage patterns | ✓ | partial | — |
| Pre-failure flashing | — | ✓ | partial |
A drone-only inspection is a survey. A walked-only inspection misses what’s underneath. An attic-only inspection misses the surface. Real diagnosis requires all three.
What to Avoid
Some “inspection” services we’d recommend declining:
Drone-only inspections from out-of-area companies
Some companies offer cheap drone-only inspections, often as lead generation for a sales pitch. Without the walked inspection and attic visit, the diagnosis is incomplete.
Inspections without written reports
Verbal findings disappear. Get everything in writing with photos.
Inspections that quote replacement without diagnosis
Some inspectors are paid by the size of the eventual job. If the inspector recommends replacement without showing you specifically why (with photos and findings), get a second opinion.
Free inspections from door-knockers after a storm
These are sales calls disguised as inspections. The “damage” is often invented or exaggerated.
What an Honest Inspection Costs
In Snohomish County:
- Free from local roofers building a referral relationship (us included, in our service area).
- $200 to $400 for paid independent inspections from non-roofing inspection companies.
- $300 to $600 for forensic-level inspections with detailed engineering reports (used in litigation or major insurance disputes).
For routine pre-purchase or annual inspections, free or low-cost is the norm. Don’t pay $1,000 for an inspection unless you’re in a specific dispute or warranty matter.
How to Book
If you’re in our Snohomish, North King, or Skagit County service area and want a real inspection (drone + walked + attic + thermal), we’re glad to schedule one. Free, no obligation, written report.
If we find something, we’ll tell you in writing. If we don’t, we’ll tell you that too.