What a test square is
A test square is a 10-by-10-foot area (one roofing square) marked on a roof slope. The inspector counts hail hits that fracture the shingle mat or displace granules down to the asphalt inside that square. Many carriers approve replacement of a slope when the count reaches a threshold — often 8 to 10 hits — though guidelines vary and are not written into most policies.
Why the direction of the storm matters
In Laramie, Platte and Goshen counties, hail commonly arrives on a west or northwest wind. West and north slopes can be heavily damaged while east and south slopes barely qualify. Enter every facet separately — including small ones over porches and garages — rather than averaging across the roof.
When the threshold isn’t the whole story
- If the remaining slopes can’t be matched, your policy’s language on matching and uniform appearance may matter more than the count.
- Older, brittle shingles may not survive spot repairs on a slope that doesn’t technically qualify.
- Siding, windows, gutters and soft metals on the windward side often show damage even when shingle counts are low.
Illustrative figures only: the default rows show a 34.4-square roof where the west and north slopes qualify at 8 hits — 17.2 squares, or 50% of the roof.
Questions about this calculator
Is the 8-hit threshold in my policy?
Usually not. It is a common carrier guideline. Ask the adjuster in writing what threshold was applied to your roof.
Should I count hits myself?
Only if you can do it safely from the ground or with a professional. Roofs are dangerous; a contractor or appraiser can mark and photograph test squares for you.