How to Identify Roof Damage, Roof Inspection, What to Look For
Check your attic after severe weather. A leak could mean some shingles are damaged, the underlayment — a protective barrier between your shingles and the plywood of your roof — has failed, or flashing — the material that seals joints on your roof — has deteriorated.
Blistering or peeling paint
Poor ventilation may cause moisture to get trapped in your house, which may cause exterior paint to peel and blister.
Ceiling and wall stains
Leaks from outside the house or moisture trapped inside it can cause stains and possibly mold or mildew.
Another issue with poor ventilation and moisture in your layers of roofing materials is the decay of sheathing — also called decking — which is the layer of plywood that forms the foundation of your roof. If you notice a sagging ceiling, broken gutters, leaks or missing patches of shingles, your sheathing may be damaged.
When shingles reach the end of their useful life, you may notice they fall off or become cracked, brittle or curled, which means it may be time for a new roof.
It may look like dirt, but dark stains on your shingles may be moss, lichen, or blue-green algae. This may not require a new roof, but if and when you do replace your shingles, ask for StainGuard® and StainGuard® Plus protection, which are available on many GAF shingles.