Asphalt Shingle Failure Diagnostics
Your roof looks terrible, but is it actually storm damage? Learn how to identify the structural anatomy of an asphalt shingle to prevent the adjuster from brushing off your claim as “normal wear.”
The Asphalt Defense Index
Asphalt shingles are the most common roofing material in North America, but they are also the most frequently misunderstood. To win an insurance claim, you cannot just point at an ugly roof; you must prove that the internal skeleton of the shingle has been compromised by a sudden event.
1. The Anatomy of an Asphalt Shingle
To argue with an adjuster, you must know what the shingle is made of. An architectural shingle has three primary layers:
- The Fiberglass Mat: This is the skeleton. It gives the shingle its tear-strength and rigidity. If this mat breaks, the shingle is functionally dead.
- The Asphalt Core: The fiberglass is coated in thick, weather-grade asphalt. This provides the actual waterproofing layer. As it ages, the oils bake out of it, making it brittle.
- The Ceramic Granules: The colored rocks on top. They are not there for waterproofing; they are there to protect the asphalt core from UV rays (the sun) and provide fire resistance.
The “Delamination” Trap
Architectural shingles are actually two layers of material glued together at the factory. Sometimes, this glue fails, and the top layer slides off the bottom layer. Adjusters will try to call this wind damage to close a cheap repair claim. It is not wind damage. It is called Delamination, and it is a massive manufacturer defect. If your roof is delaminating, the manufacturer owes you a new roof, not your insurance company.
2. Why “Granule Loss” Is a Losing Argument
If you call your insurance company because your gutters are full of granules, they will almost certainly deny the claim. Granules shed naturally every single day due to rain, thermal expansion, and age.
Insurance policies specifically exclude “wear and tear.” Granule loss is the definition of wear and tear. The only time granule loss matters is when it is localized and caused by an impact (like hail) that simultaneously bruises the fiberglass mat underneath it. Do not let your contractor argue that the wind “blew the granules off.” It is a fast track to a denial letter.
3. The Thermal Cracking Loophole
As shingles age and lose their volatile oils, they become rigid. During a hot summer day, they expand. During a freezing night, they contract. After 10 years of this, the tension causes the shingle to literally tear itself apart, creating jagged, vertical cracks.
Adjusters love thermal cracking because it is a manufacturer issue, meaning they don’t have to pay. However, severe wind flutter can also cause vertical tearing. If your roof is relatively new and experiencing vertical tears after a massive windstorm, you must demand a forensic engineer to prove the wind caused the stress fractures.
4. Demanding the Repairability Test
If the adjuster agrees a few shingles are damaged but insists on writing a $500 estimate to patch them, you must force them to physically manipulate the asphalt. As asphalt ages, it becomes too brittle to survive a repair.
“Before we accept a repair estimate on an asphalt system of this age, we require a documented physical Brittle Test. We need you to lift the surrounding, undamaged shingles to the 45-degree angle required to strike a nail. If lifting those shingles causes the asphalt to crease or the fiberglass mat to snap, the roof is unrepairable and we will require a total slope replacement.”