Why pitch matters so much here
A square is 100 square feet of roof surface. Because a sloped roof is longer than the floor beneath it, the surface grows with pitch: an 8/12 roof has about 20% more surface than its footprint, and a 12/12 roof about 41% more. Many older homes in Wheeling, Charleston’s East End and the river towns are steep two-story houses, so a footprint-based count can come up several squares short.
Comparing with the carrier
Enter the squares on the insurer’s estimate to see the difference. A gap of a square or two can come from rounding or waste choices. A bigger gap usually means a missing slope, a porch roof left out, or a pitch measured wrong — exactly the kind of scope issue appraisal can resolve.
Steep and high charges
Estimating software typically adds labor for steep pitches and for roofs two or more stories up. Check that those lines are present when your pitch is 7/12 or steeper. Metal panels and slate have their own waste and labor patterns, so treat this tool as a first check rather than a replacement for a field measurement.
Questions about this tool
Is this accurate enough to dispute an estimate?
It is good for spotting a large discrepancy. For appraisal, use a field measurement or aerial report with each slope drawn.
Why does the waste factor change with roof shape?
Hips, valleys and dormers require more cutting, so more material is wasted. Simple metal-panel gables waste very little.