Hidden roof damage is the damage you cannot see from the yard or the rooms below: failed flashing tucked under siding, torn or brittle underlayment beneath shingles and tiles, a wet or rotting deck, broken shingle seals after wind, and moisture building up in the attic. A professional roof inspection finds it by working on the roof and in the attic, before it shows up as a stain or a sagging ceiling. Call NEMA Roofing at 866-631-3366 to have yours checked.
Where does roof damage hide?
| Hidden problem | Where it hides | How an inspector finds it | How it shows up later |
|---|---|---|---|
| Failed step flashing or counterflashing | Behind siding, stucco or chimney masonry where the roof meets a wall | Checking the flashing edges up close and the wall framing from the attic | Stains on an inside wall, rot in the wall below the roof |
| Worn underlayment | Under the shingles or tiles | Lifting sample tiles; looking at exposed edges at valleys and eaves | Leaks with no visible break in the roof covering |
| Wet or rotted deck | Under the covering | Soft spots underfoot on shingle roofs; stains and damp wood seen from the attic | Sagging, nails that no longer hold, a patch that turns into new sheathing |
| Broken shingle seals | Shingles that lifted in wind and dropped back flat | Checking by hand whether the tabs are still bonded | Shingles that blow off in the next strong wind |
| Attic condensation | On the underside of the deck and on nail tips | Rusty nail tips, damp spots, blocked eave or ridge vents | Mold, musty smells, deck damage that looks like a leak |
| Old sealant patches | Over earlier problems at vents and flashing | Checking what the sealant is covering | The original problem returns once the sealant cracks |
Why is hidden damage the expensive kind?
Visible damage gets fixed because someone sees it. Hidden damage keeps working through every rain and every hot afternoon until it reaches something you notice, and by then it has usually spread past the part that failed first. A failed flashing that is caught early costs a flashing repair. Found through a wall stain, the same failure can also mean wet framing, drywall and paint.
Wood that stays damp loses strength, fasteners set in it rust and loosen, and insulation that gets wet stops insulating. None of that makes a sound, which is why roofs are checked on a schedule rather than when something looks wrong.
How do inspectors find what you cannot see?
- Working from the attic and the roof together. A stain on the rafters is traced uphill to the spot on the roof where water gets in.
- Feeling as well as looking. Soft decking, loose flashing and unbonded shingles are found by touch.
- Looking under the covering. On tile roofs, lifting a few tiles shows the condition of the underlayment; on flat roofs, probing seams shows whether they are still bonded.
- Water testing. For a leak that only appears in certain storms, running water over one section at a time while someone watches inside narrows down the source.
- Photos and imaging. Drone photos help on steep or fragile roofs, but they only show the surface; our article on automated roof assessments explains what they miss.
What hidden damage do storms leave?
After strong wind, damage is often invisible from the ground. Shingles can lift, break their seal and settle back flat, looking normal until the next wind takes them. Tiles can crack at the part covered by the tile above. Ridge and hip pieces loosen. Branches that brush the roof scrape away granules without leaving a hole. If a storm has passed, book an inspection even when the roof looks fine, and ask for photos of any storm damage, which helps if you file an insurance claim.
Buying or selling a home?
A general home inspection covers the whole house, so the roof may be viewed from the ground, a ladder or a drone. If that is what happened, a roof inspection by a roofer adds the attic tracing, the hands-on checks and the flashing details listed above. For a seller, fixing hidden problems before listing avoids surprises in the buyer’s report. The roofing inspection checklist shows what you can check yourself first.
What happens when we find hidden damage?
We show you what we see, explain why it matters and help you take the right next step, without pressure or confusing jargon. Every finding is photographed so you can see the problem for yourself, and the report says how urgent each one is. If a repair is needed, our roof repair service takes it from there; for what the report should look like, see reading your roof inspection report.
Schedule an inspection
From Tarzana and Woodland Hills to Downey, Oxnard and Santa Barbara, NEMA Roofing’s five locations cover Los Angeles, Ventura, Santa Barbara, Riverside and San Bernardino counties completely; the service areas page lists the towns we reach. Read about our roof inspection service, or call 866-631-3366 to book.
