How much does roofing felt weigh?

Metal roof systems in most cases weigh between 1 to 3 pounds per square foot. The actual weight is dependent upon metal gauge and profile of the panel. Metal roof systems are considered a lightweight roof covering compared to their counterparts. The following illustrates the different types of other roofing materials and their respective weights per square foot:
Asphalt Shingle: 2 - 3.5lbs psf
Textured Asphalt Shingle: 3.5 - 5lbs psf
Wood Shingles/Shakes: 3.5 - 4.5lbs psf
Clay or Concrete Tile: 5.5 - 10lbs psf