Test Square
A test square is a measured area on a roof, typically 10 feet by 10 feet (100 square feet), used by adjusters and inspectors to count and document hail hits, wind damage, or other storm impacts per unit area.
Measuring Damage Density
A test square is a defined area, typically 10 feet by 10 feet (one roofing square or 100 square feet), marked out on a roof surface during inspection to systematically count and document the number of hail hits, wind damage marks, or other storm impacts within that measured space. Test squares convert subjective damage observations into quantifiable data. Instead of saying "the roof has hail damage," the inspector can report "8 functional hits per test square on the north slope and 12 per test square on the west slope."
This data is the foundation of the damage determination.
Conducting a Test Square Inspection
Mark out a 10-by-10-foot area on the roof using chalk or tape. Systematically inspect every shingle within the square, identifying and marking each impact point with chalk. Count functional hits separately from cosmetic hits. Photograph the entire test square showing the marked hits, then take close-ups of representative damage points. Repeat on each slope, selecting areas that represent the slope's overall condition. On slopes facing the storm direction, damage density will typically be highest.
Record the test square location, slope orientation, pitch, and count for each square. This data creates a damage map of the entire roof.
Using Test Square Data
Test square counts support or challenge the scope of the claim. If test squares show consistent functional damage across all slopes at densities of 8+ hits per square, the data supports a full roof replacement. If only one slope shows damage above the threshold, the data supports a partial repair. This quantifiable approach is more defensible than visual impressions alone. When disputing an adjuster's determination, presenting your own test square data with photos and counts gives the supplement concrete evidence rather than just a disagreement about what the damage looks like.
Frequently asked questions
A thorough inspection typically examines at least one test square on each roof slope. On complex roofs, multiple test squares per slope may be needed to account for varying exposure to the storm. The goal is to represent the damage density across the entire roof.
There is no universal standard, but most industry professionals consider 8 or more functional hits per 100 square feet to be indicative of damage that warrants replacement. Some manufacturers set their own thresholds. The key factor is whether the hits cause functional damage.
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