What Is a Test Square?
On a roof inspection, a test square is a ten-foot by ten-foot patch marked on one slope, where the inspector counts hail hits or damaged shingles to judge how severe the damage is. Many insurers compare the count with an internal guideline when deciding between repairing and replacing the slope.
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On a roof inspection, a test square is a ten-foot by ten-foot patch marked on one slope, where the inspector counts hail hits or damaged shingles to judge how severe the damage is. Many insurers compare the count with an internal guideline when deciding between repairing and replacing the slope.
Test Square explained
A roofing square is 100 square feet, so a test square samples one square of surface on one slope. The inspector marks the area with chalk, counts the marks or damaged shingles inside it, and photographs the result. Slopes are tested separately, because hail often arrives with wind and strikes the windward side harder than the rest.
The counts feed the repair-or-replace decision. Carriers often keep an internal threshold for how many qualifying hits per test square justify replacing a slope, and that threshold differs by carrier, product, and sometimes region, so a rep should never present one number as a universal rule. Contractors run their own test squares before an adjuster arrives and again at a reinspection, so photos and counts line up with the method the carrier uses.
Placement and counting are where inspections go wrong. A square set on a spot with foot traffic, old repairs, or unrelated defects will mislead. Dents in vents or gutters support the hail story but are not the same as counted roof damage. Some carriers also rely on other methods, including repairability testing and engineer opinions, so a test square count is one input, not the only way a roof claim is decided.
Why it matters when you're buying
Explaining test squares in a driveway shows a homeowner why one slope may be treated differently from another and why a chalked, photographed count carries weight with an adjuster. That clarity prevents promises about full replacement and makes slope-by-slope documentation feel worth the effort.
Frequently Asked Questions
How big is a test square on a roof?
How many hits per test square mean a roof gets replaced?
Does a test square count decide whether a roof claim is approved?
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