What the inspector looks at
A standard home inspection covers the roof covering, drainage, flashing, skylights, chimneys and roof penetrations. The goal is to describe the type of roof, report visible defects and note anything that suggests active or past leaking.
- Roof covering: missing, cracked, curled, slipped or heavily granule-worn material.
- Flashing: metal at walls, chimneys, skylights, valleys and plumbing vents. Rusted, lifted or caulk-only flashing is a frequent finding.
- Penetrations: vent pipes, solar mounts, satellite brackets and HVAC curbs. Every hole through the roof is a potential leak.
- Drainage: gutters, downspouts, scuppers and, on low-slope roofs, ponding water.
- Signs from inside: stains on ceilings and on the underside of roof sheathing seen from the attic.
Typical service life by material
Lifespans vary with installation quality, ventilation and sun exposure. Southern California’s UV is hard on asphalt and on the underlayment beneath tile.
| Material | Typical range | What usually fails first |
|---|---|---|
| Asphalt composition shingle | 18 to 30 years | Granule loss, cracking on south and west slopes |
| Concrete or clay tile | 50+ years for the tile | Underlayment, often at 20 to 30 years |
| Wood shake | 15 to 25 years | Splitting, cupping; fire rating concerns |
| Low-slope (built-up, modified bitumen, TPO) | 10 to 25 years | Seams, ponding areas, flashing at walls |
| Metal (standing seam) | 40 to 60 years | Fasteners, sealant at penetrations |
Tile roofs: the hidden layer
Tile is common across Orange County and San Diego. The tiles themselves last for decades, but they are not the waterproofing. Underneath is a layer of felt or synthetic underlayment, and that layer dries out and tears. A tile roof can look perfect from the street while the underlayment is finished. Broken or slipped tiles, debris in valleys and staining in the attic are the clues inspectors report. When underlayment is suspect, the remedy is usually a “lift and relay”: tiles are removed, new underlayment goes down, and the original tiles go back on.
Findings that need a specialist
Treat these as a reason to get a licensed roofer out before your contingency ends:
- Active leaks or fresh staining in the attic.
- Soft or sagging areas, which can mean rotted sheathing.
- More than one layer of shingles, which shortens life and complicates replacement.
- Wood shake in a designated fire hazard severity zone, where insurance may be difficult.
- A report note that the roof is “at or near the end of its service life.”
What the inspection does not cover
Inspectors generally don’t remove tiles, lift shingles, test the roof with water or predict future leaks. Solar panels block a view of the roofing beneath them, and the panels themselves are usually outside the scope. If solar is present, ask who owns it, whether it is leased, and how a future reroof will be handled.
A roof that is “serviceable” today can still be due for replacement in a few years. Budget for it rather than being surprised by it.
Common questions
Will the inspector walk on the roof?
Only when it is safe to do so. Most standards let the inspector use binoculars, a ladder at the eaves or a camera pole instead. Steep, wet, fragile or tile roofs are often viewed from the ground or the edge to avoid damaging them.
Can an inspector tell me exactly how many years the roof has left?
No. They can estimate where the roof sits in its typical lifespan based on material, visible wear and any known installation date. Permits and receipts from the seller give a far better age.
Do I need a separate roof certification?
Some lenders, insurers and buyers ask for one, especially on older roofs. A roof certification comes from a licensed roofing contractor, not a home inspector, and usually states a number of years the roofer expects it to stay watertight.