Evaluating Wind-Induced Distress in Asphalt Shingle Roof Systems
Understanding the Difference Between Cosmetic Observations and Physical Evidence
Daniel Jama
Florida Property Insurance Expert Witness | Public Adjuster | Appraiser | Umpire
SCLA | CPAU
Wind damage to asphalt shingle roof systems is frequently misunderstood because the most significant damage is often not immediately visible. While missing shingles are easily recognized, many wind-related failures occur long before materials are displaced from the roof. The objective of a professional evaluation is not simply to identify obvious damage, but to determine whether the roof system has sustained physical changes consistent with wind-induced uplift forces.
As wind travels across a roof surface, it creates areas of negative pressure that attempt to lift the leading edge of each shingle. Under normal conditions, the manufacturer’s sealant strip resists these uplift forces by bonding adjacent shingles together. When wind loads exceed the adhesive strength of the sealant, shingles may partially separate, flex repeatedly, or permanently lose their bond. Although the shingle may settle back into its original position after the storm, the mechanical characteristics of the roofing system have already changed.
One of the most significant indicators of wind distress is flexural creasing. As a shingle bends beyond its intended design limits, the fiberglass reinforcement and asphalt matrix may fracture internally, producing a visible crease or permanent deformation. Once this occurs, the shingle’s ability to resist future wind events is substantially diminished. Likewise, loss of thermal adhesion allows individual shingles to become increasingly vulnerable to progressive uplift during subsequent weather events.
A complete roof evaluation extends well beyond identifying isolated damaged shingles. An expert should assess the overall roof system, including the distribution and consistency of damage, the condition of sealant strips, evidence of repeated uplift, age-related deterioration, repairability, and compliance with manufacturer installation requirements. These observations should be considered collectively rather than independently. No single photograph or isolated condition should determine the final opinion.
Equally important is proper documentation. High-resolution photographs, field measurements, attic observations, weather data, and detailed inspection notes create a permanent record of conditions that may no longer exist after repairs or additional storms. In litigation, appraisal, or claim review, the quality of the documentation often carries as much weight as the physical observations themselves.
As an expert witness, my responsibility is not to advocate for either party, but to evaluate the available evidence objectively and determine whether the observed conditions are consistent with accepted engineering principles, roofing practices, and industry standards. Opinions should be supported by documented facts, established methodology, and reliable technical references rather than assumptions or isolated observations.
Although every property presents unique characteristics, the principles governing wind-induced damage remain consistent. Understanding how wind affects asphalt shingle systems—and recognizing the subtle indicators of physical damage—helps ensure that roof evaluations are based on science, experience, and objective analysis rather than appearance alone.
Suggested References
• ASTM International – Roofing Standards
• National Roofing Contractors Association (NRCA) Roofing Manual
• Asphalt Roofing Manufacturers Association (ARMA)
• FEMA Mitigation and Wind Damage Guidance
• Insurance Institute for Business & Home Safety (IBHS)
• Manufacturer Technical Bulletins (GAF, Owens Corning, CertainTeed, Atlas)
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