Question

List the following roofing materials from lightest (per area covered) to heaviest: concrete roof tiles, wood shingles, built-up, copper, and slate (3/8- to 1/2-inch, or 9.5- to 12.7 millimeter).

Answer

Copper: 1.5-2.5 pounds per square foot (psf) or 72-120 pascal (Pa)
Wood Shingles: 2-3 psf (96-144 Pa)
Built-Up: 6.5 psf (311 Pa)
Concrete Roof Tile: 9.5 psf (455 Pa)
Slate: (3/8- to 1/2-inch, or 9.5- to 12.7 millimeter): 14-18 psf (670-862 Pa)