How much life is left, in years, and what is that based on?

The useful output is a number with reasoning attached: covering type, apparent age, granule condition, and how the sunny slope compares with the shaded one. “Looks fine” is an opinion; a documented estimate is something you can plan and budget around.

Which specific details are failing, and where?

Named locations rather than general condition: the flashing at the rear chimney, the boot on the third vent, the valley on the north side. That list is what makes three later bids comparable, because every bidder is then pricing the same findings.

Was the attic looked at, not just the roof surface?

Half of what shortens a roof in this climate is visible only from below: buried soffit intake, rusted nail tips from condensation, damp insulation, bath fans ducted into the attic instead of outdoors. A surface-only inspection has read one side of the page.

Is anything urgent, and what can wait a season?

The two categories should be separated explicitly. Sorting the list this way is what turns an inspection into a plan, and lets you gather replacement quotes in the quiet months rather than during a wet week in August.

Are there photographs of every finding?

Photographs turn a report into evidence you can use in a purchase negotiation or hand to three contractors. A finding without an image is something you have to take on trust from someone who may also want to sell you the fix.

What actually fails a roof inspection?

Exposed or missing fasteners, flashing that has been caulked over instead of replaced, bald patches where granule loss has gone past cosmetic, soft decking underfoot, and an active leak traced back to the attic. A lender or insurance inspection is checking for these specific items rather than scoring overall condition, so a roof with years left can still fail on one flashing detail that gets corrected in an afternoon.

Roof inspection

An inspection is worth its cost when it answers a decision you are about to make: buying a house, or deciding whether this is the year.

What gets looked at

The field of the roof: granule loss, curling, cracking, blistering, and how uniform the wear is. Every transition: valleys, ridges, hips, and the flashing at walls, chimneys, skylights and vents. Penetrations for plumbing stacks and exhaust. Gutters, and whether they are carrying water away from the foundation or into it. And the underside, from the attic, which is where active leaks and old stains show most clearly.

When a roof is near the end

Wear is not always visible from the ground and is not always obvious even from the roof. A shingle can lose its granule layer without losing its shape, and that shows up as accelerated aging over the following years rather than as an immediate leak. An inspection is most useful before a covering reaches the end of its service life, while there is still a choice about when to act.

This region runs a full range of seasons, and Loudoun, Prince William and western Maryland see enough of each that a roof past twenty years is worth looking at.

Buying or selling

A general home inspection includes the roof, but usually from the ground or a ladder at the edge, and usually as one item among two hundred. A dedicated roof inspection produces something specific enough to negotiate with: an estimate of remaining life, a description of what is failing and where, and a written record dated before closing.

This is why the request comes up so often in the markets where houses change hands quickly. Around Arlington and Bethesda, and out through Rockville and Ashburn, a roof with no documented condition becomes a number someone invents during negotiation. A dated report replaces that number with a finding.

What a written inspection should answer

How much life is left, in years, and what is that based on?: The useful output is a number with reasoning attached: covering type, apparent age, granule condition, and how the sunny slope compares with the shaded one. “Looks fine” is an opinion; a documented estimate is something you can plan and budget around.
Which specific details are failing, and where?: Named locations rather than general condition: the flashing at the rear chimney, the boot on the third vent, the valley on the north side. That list is what makes three later bids comparable, because every bidder is then pricing the same findings.
Was the attic looked at, not just the roof surface?: Half of what shortens a roof in this climate is visible only from below: buried soffit intake, rusted nail tips from condensation, damp insulation, bath fans ducted into the attic instead of outdoors. A surface-only inspection has read one side of the page.
Is anything urgent, and what can wait a season?: The two categories should be separated explicitly. Sorting the list this way is what turns an inspection into a plan, and lets you gather replacement quotes in the quiet months rather than during a wet week in August.
Are there photographs of every finding?: Photographs turn a report into evidence you can use in a purchase negotiation or hand to three contractors. A finding without an image is something you have to take on trust from someone who may also want to sell you the fix.
What actually fails a roof inspection?: Exposed or missing fasteners, flashing that has been caulked over instead of replaced, bald patches where granule loss has gone past cosmetic, soft decking underfoot, and an active leak traced back to the attic. A lender or insurance inspection is checking for these specific items rather than scoring overall condition, so a roof with years left can still fail on one flashing detail that gets corrected in an afternoon.

Roofs rarely give out in the open. They give out at the seams. Where the work actually happens on a roof.

Tap to enlarge

1 Ridge caps. Thin, fully exposed, and the first course to lift.
2 The field. Granule loss is the honest measure of how much life is left.
3 Valleys. One channel taking the runoff of two slopes, all year round.
4 Flashing. At the chimney, and where the garage roof meets the wall of the house.
5 The vent boot. Small, rubber, and on a much shorter clock than everything around it.
6 Eaves. Where water that has backed up at the edge gets under the courses.

The rest of the work

Areas covered

All areas covered