The most common forms of asphalt or fiberglass shingle failure are when:
- The shingle gets a small crack or a series of small cracks in its surface, extending from the bottom edge to the top of the shingle. The roof will need to be re-roofed.
- The adhesive strip on the underside of the shingle does not adhere to the shingle under it. Result, the shingles tabs get blown back and break off. The roof will need repair or it may need re-roofing if the problem is on numerous shingles.
- When the granulated surface deteriorates within a few years of the installation. A fiberglass cloth will be visible where the grit is missing, often most visible along the edges of the tabs. Grit on the surface equates to shingle life and a bare area will deteriorate quickly.
These are manufacturing defects that are possibly covered under warranty. For more information contact the supplier of the shingles.
NOTE: In most cases the manufacturer will not do much for you if the shingles are more than a few years old. If they do, their liability is limited to the cost of the shingles pro-rated down for every year of use use.
Bottom Line: You will get next to nothing from the manufacturer for your problem.