Roof Inspection Checklist: Warning Signs Homeowners Shouldn't Ignore

Roof problems rarely show up all at once. A lifted shingle tab or a small flashing gap can sit unnoticed for months before it turns into an interior leak, by which point the repair has gotten more expensive and possibly involves drywall, insulation, or mold remediation on top of the roof work itself. Catching problems early is almost entirely a matter of looking in the right places on a predictable schedule. GAF, one of the largest roofing shingle manufacturers in North America, publishes homeowner guidance on exactly what to check and when; IBHS, the insurance industry's building-safety research organization, frames the same idea from the insurer's side — that roof inspection, maintenance, and repair are ongoing activities over the life of a roof, not a one-time event at installation.

The rest of this guide is organized as a checklist you can actually run: what to check from the ground, what to check in the attic, and when to stop checking yourself and call a professional.

GAF's homeowner guidance recommends a simple cadence: spot-check your roof once in spring and once in fall, in addition to a check after any major storm event (hail, high wind, or a heavy snow load). Spring and fall bracket the two seasons that put the most stress on a roof — summer heat and UV exposure, and winter ice and snow load — so checking right before and after each is a practical way to catch damage while it's still a minor repair.

You do not need to get on the roof to run most of this checklist — and GAF specifically cautions that inspecting a roof yourself by climbing on it is risky and requires safety precautions, so a pair of binoculars from the ground or a walk around the perimeter is the safer starting point for a homeowner.

Look for: missing, cracked, curling, or lifted shingles; dark streaks or patches on the roof surface (often algae, but sometimes a sign of granule loss exposing the underlying material); sagging anywhere along the roofline, which can indicate structural or decking problems underneath; and damaged or missing flashing around chimneys, skylights, and any roof penetrations. GAF specifically flags making sure pipes and roof penetrations don't have exposed nails and that flashing isn't damaged or providing inadequate coverage as a common failure point.

Check the gutters too, not just the roof surface. GAF's guidance includes checking gutters for debris and signs of sagging or leaks — a gutter pulling away from the fascia or overflowing during rain is often the first visible sign of a drainage problem that will eventually affect the roof edge itself.

Some of the most useful information about your roof's condition is only visible from inside the attic, and it often shows up before any exterior sign does. GAF recommends checking the attic for signs of leaks, dark spots, holes, or sagging sheathing, plus checking ceilings throughout the house for stains, mold, or mildew, which can indicate a slow leak that hasn't yet become obvious from the roof surface.

GAF also specifically calls out checking the attic for mold or mildew and for proper ventilation. Ventilation is worth taking seriously on its own: poor attic airflow traps heat and moisture, which can shorten the life of the shingles from underneath even if the roof surface looks fine, and it's a completely different repair (adding or unblocking vents) than a leak repair — so it's worth having a contractor evaluate the two separately rather than assuming a moisture problem is automatically a leak.

IBHS, whose technical guidance describes the professional roof-survey process in detail, frames a proper inspection as an evaluation of the cause and extent of natural aging, normal wear, or damage related to wind, hail, fire, cold weather, or other events — distinguishing, for example, ordinary weathering from an actual hail-impact pattern, which is not always obvious to an untrained eye even at close range.

This distinction matters in practice: not every dark spot or granule loss pattern is hail damage, and not every roof that looks fine from the ground is free of impact damage. A professional inspection using IBHS-aligned assessment criteria evaluates specific damage modes — deformation, granule loss, and breaches — rather than a general visual impression, which is exactly the kind of assessment worth getting before you decide whether an insurance claim is warranted.

Call a roofing contractor for a full inspection if your ground-level or attic check turns up any of the following: an active leak or fresh water stain, visible sagging anywhere on the roofline, missing shingles after a storm, or any doubt at all about whether granule loss or discoloration is cosmetic aging or actual damage. GAF's own guidance points homeowners toward getting a roof inspected by a certified contractor before deciding whether replacement is necessary, rather than making that call from a ground-level visual check alone.

The two-inspections-a-year habit is what makes this cheap. Catching a lifted shingle or a small flashing gap in spring, before it survives a full summer of UV exposure and a winter freeze-thaw cycle, is a small repair. Finding the same problem a year later as an active ceiling leak usually is not.