The roof is the first line of defense between your home and every element the sky produces — rain, hail, wind, sun, snow, and ice. A compromised roof allows water into the building structure, and water inside the structure causes damage that escalates quickly and expensively: stained ceilings, rotted sheathing, saturated insulation, mold colonization in the attic, and eventually structural failure of the framing. A professional roof inspection every 3–5 years catches problems that require rooftop access. But a homeowner inspection from the ground — using binoculars and a slow, methodical walk around the perimeter — catches the visible problems between professional visits and costs nothing but twenty minutes of attention.
What to Look For from the Ground
Missing or damaged shingles. Asphalt shingles that are cracked, curling at the edges, or missing entirely expose the underlayment and sheathing to direct weather contact. A few missing shingles after a storm is a targeted repair. Widespread curling, cracking, or granule loss across the roof surface indicates the shingles are approaching end of life — typically 20–30 years for three-tab asphalt and 25–40 for architectural shingles.
Flashing. Metal flashing is installed around chimneys, plumbing vents, skylights, and at every roof valley to direct water away from penetrations and transitions. Flashing that has lifted away from the surface, rusted through, or separated from the sealant is one of the most common entry points for roof leaks. From the ground, look for metal pieces that appear raised, bent, or displaced.
Gutters and granules. Inspect inside the gutters for granule accumulation — the small, sand-like particles that coat the surface of asphalt shingles. As shingles age, these granules shed and collect in the gutters. Heavy granule loss means the shingles are losing their protective UV coating and are deteriorating. Also check that gutters are firmly attached to the fascia, properly sloped toward downspouts, and free of debris that causes overflow.
Moss, algae, and organic growth. Dark streaks on the roof surface are typically algae (Gloeocapsa magma). Green growth is moss. Both indicate moisture retention on the roof surface. Moss is the more serious concern — it sends root-like structures under shingle edges, lifting them and allowing water underneath. Zinc or copper ridge strips can prevent future growth.
When to Call a Professional
A professional inspection is recommended every 3–5 years, after any major storm event (hail, high winds, fallen debris), when buying or selling a home, and any time you observe potential damage from the ground. A qualified roofer inspects from above — walking the surface, checking the underlayment condition, evaluating flashing adhesion, and assessing remaining shingle life with a level of detail that ground inspection cannot match. The cost of a professional inspection is typically $150–$400 and is trivial compared to the cost of undetected water damage.
Where To Start
- Walk the perimeter twice a year. Look for missing shingles, lifted flashing, moss, gutter condition.
- Check for granules in gutters. Accumulation means shingles are losing protective coating.
- Professional inspection every 3–5 years. A roofer sees what the ground cannot show.
The roof protects everything beneath it. A twenty-minute walk around the perimeter with binoculars, twice a year, is the simplest and most cost-effective way to catch problems while they are still repairs rather than replacements.
When was the last time you looked at your roof — really looked — and what did you notice?