Impact Resistance Test Protocol for Asphalt Shingles
IBHS developed and maintains the IBHS Impact Resistance Test Protocol for Asphalt Shingles, which provides a scientific, repeatable laboratory test method for evaluating how asphalt shingles perform when exposed to laboratory hail impacts that mimic the properties of natural hailstones and the types of damage they create.
Research
Impact Resistance Test Protocol for Asphalt Shingles is designed to replicate key physical aspects of natural hail, including impact energy, hailstone material properties, and impact mechanics, using laboratory-manufactured hailstones propelled under controlled conditions. The protocol was built and is maintained to reflect the current state of hail science while recognizing the inherent variability of real storms.
Rather than assigning pass/fail rating, the test is structured to distinguish relative performance and objectively assess performance for the key damage modes of dents, tears, and granule loss.
Purpose & Use
The protocol is designed exclusively for research and product comparison purposes. It is not intended for insurance claims or legal claims handling, product warranties, or legal standards. Instead, it supports the roofing industry, researchers, and product developers by providing data that advances understanding of hail performance in roofing materials.
The methodology reflects extensive IBHS field research, collaboration with industry experts, and analysis of existing testing standards. Its goal is to improve the resilience of roofing systems by offering a more accurate assessment of how shingles withstand hail.
