What a hail test square means and when it really justifies a full roof replacement

On Oct. 29 a homeowner posted on Reddit's r/Roofing forum that roofers had found more than 10 hail hits in a test square, plus cracked shingles and broken skylights, and recommended a full replacement. That roof had already been replaced through insurance three years earlier. The owner asked whether a second claim would raise the premium or cost them the policy.

InterNACHI, the home inspectors' association, lays out the method adjusters use. Every slope gets a 100-square-foot test area, placed where damage is heaviest and away from spots sheltered by trees. Only strikes that count as functional damage are tallied; cosmetic marks are not. The number needed to replace a slope differs by insurer, and eight is common, InterNACHI says. Roof age weighs on whether the whole roof or only some slopes get replaced, and some carriers use a formula.

A single square proves less than it seems. Giancarlo Grant, a senior managing consultant at BRG, wrote in Claims Journal that hail lands at random, so one square can miss damage or overstate it, and higher counts carry wider uncertainty. He recommends several squares per slope, with locations picked at random on each exposure before anyone climbs up. Ask both the roofer and the adjuster for the count on every slope, with photos.

A second claim carries risk. The consumer guide from the National Association of Insurance Commissioners says claim frequency and claim type both feed into the premium and into the insurer's decision to renew. Most insurers report claims to shared databases such as CLUE. Insurers can generally decline to renew, usually with about 30 days' notice depending on the state. If the dispute is over the amount, the NAIC points to the policy's appraisal clause, a licensed public adjuster or an attorney, and the state insurance department takes complaints.