Material
Weight per square foot
Plastic Roofing
1.19 pounds per square foot
Vertical Beams
53.41 pounds / 23.11 square feet = 2.31 pounds per square foot
Column
50.17 pounds / 14.83 square feet = 3.38 pounds per square foot
Horizontal Beam
40.7 pounds / 17.67 square feet = 2.30 pounds per square foot
Joists (2x8x16 rafters made from redwood)
54.87 pounds / 26.88 square feet = 2.04 pounds per square foot