Inspection ZonesWhat We Evaluate During a Professional Roof Inspection
A professional inspection looks at the roof in connected zones rather than treating every component as an isolated item.
Owens Corning recommends evaluating the overall roofing system, including the deck, attic, flashing, chimney and roof penetrations, while GAF and CertainTeed also identify surface condition, flashing, attic moisture and ventilation as important inspection areas.
Roof Surface and Shingle Condition
On an asphalt-shingle roof, we evaluate the visible condition and consistency of the roofing material. Depending on the roof, that may include looking for:
- 1missing or displaced shingles
- 2cracking, curling or other deterioration
- 3unusual granule loss
- 4damaged roof edges
- 5previous repair areas
- 6inconsistent or disturbed roofing sections
- 7visible fastening or installation concerns
One damaged shingle doesn't tell us the condition of the entire roof.
Likewise, an older-looking roof doesn't automatically mean replacement is necessary.
The pattern and extent of the condition matter.
Flashing, Valleys and Roof Transitions
Some of the most important inspection points aren't located in the middle of an open roof plane.
We pay particular attention to areas where water has to move around an interruption or transition, such as:
- 1roof-to-wall intersections
- 2chimneys
- 3valleys
- 4plumbing vents
- 5pipe boots
- 6dormers
- 7other roof penetrations
Flashing exists to direct water away from joints and transitions. GAF identifies damaged flashing around chimneys, vent pipes and dormers as an important inspection concern because failures there can allow water into the roof assembly.
The question isn't simply whether flashing is present.
It's whether the detail appears capable of directing water correctly.
Drainage and Roof Edges
Water needs a clear path off the roof.
During an inspection, roof edges, valleys and drainage conditions can provide clues about how water is moving across the roof and whether debris or another condition may be interfering with that path.
On tree-covered properties, leaves and small debris can collect in valleys and other drainage areas.
That doesn't automatically mean the roof is damaged, but it can help explain moisture patterns or areas that deserve a closer look.
Attic and Interior Evidence
When access and the reason for the inspection justify it, the attic can add information that isn't visible from outside. We may look for conditions such as:
- 1moisture staining
- 2damp or affected decking
- 3evidence around penetrations
- 4visible light through an opening
- 5ventilation conditions
- 6patterns that help trace suspected water entry
GAF specifically notes that attic inspection can reveal water infiltration, moisture, rot and conditions around vents, skylights and chimneys that may not be apparent from the exterior alone.
This is why an inspection should not always stop at the shingles.