roof pitch factor

https://roofingmaterialtakeoffinfo.laurelcurrent.com/posts/how-to-perform-an-accurate-roofing-material-takeoff-for-any-roof-style

The roof pitch factor is a multiplier used to adjust roofing material quantities based on the slope of the roof. A steeper pitch increases the surface area, so this factor helps calculate accurate coverage for shingles, tiles, or metal panels. It's a simple number derived from dividing the roof's actual length by its horizontal projection, ensuring you order enough materials for the job without waste or shortage.