Ignoring Hail Damage?
Asphalt Shingle Construction
Hail storm damage can be severe enough to dislodge granules from the surface of the shingles. In spots large enough to expose the asphalt will leave a roof has compromised.
The colored granules which are placed on the surface of the shingle provides an aesthetically pleasing product as well as protection to the underlying asphalt from sun exposure which results in deterioration. This is why a hail-damaged roof will tend to fail prematurely.
When indentations/surface damage of the shingle are not visible, look for indentations on vents, ridge vents, siding, or any other softer metal objects that may show impact. The effects on the shingle may not be apparent for about a year. At this time, circular areas of granules will fall off the shingle. This is often called spalling. What has occurred is that the impact of the hailstone has broken or weakened the bond between the granules and the asphalt.
After a year or so of weathering, the granules fall off the shingle in the circular area of impact. With granules missing, the sunlight (UV) quickly attacks the asphalt and the maximum performance of the shingle has been compromised. The results of a hailstorm will void the shingles manufacturer’s warrant, as they cannot warranty against “Acts of God” such as hailstorms.