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The weight of roofing constructions above the truss/rafter may be estimated with the calculator below.
Roofing Materials None Asphalt roll roofing (1.1 lbm /ft2, 5.4 kg/m2) Asphalt shingle or asphalt-fiberglass composite shingle (2.7 lbm /ft2, 13.2 kg/m2) Metal roofing - aluminum or steel - panel, sheet or shingle (1.2 lbm /ft2, 5.9 kg/m2) Terne plate - copper bearing steel sheet (0.7 lbm /ft2, 3.4 kg/m2) Wood shingle or shake (2.4 lbm /ft2, 11.7 kg/m2) Zinc roofing (1.6 lbm /ft2, 7.8 kg/m2) Copper-asphalt composite shingle (4.2 lbm /ft2, 20.5 kg/m2) Asphalt roll roofing (1.1 lbm /ft2, 5.4 kg/m2) Felt, tar and gravel roofing - 3 ply (4.8 lbm /ft2, 23.4 kg/m2) Felt, tar and gravel roofing - 4 ply (5.3 lbm /ft2, 25.9 kg/m2) Felt, tar and gravel roofing - 5 ply (6.1 lbm /ft2, 29.8 kg/m2) Felt, tar and slag roofing - 3 ply (4.5 lbm /ft2, 22 kg/m2) Felt, tar and slag roofing - 4 ply (4.8 lbm /ft2, 23.4 kg/m2) Felt, tar and slag roofing - 5 ply (5.3 lbm /ft2, 25.9 kg/m2) Ceramic slate (5.8 lbm /ft2, 28.3 kg/m2) Reconstituted slate (4.4 lbm /ft2, 21.5 kg/m2) Clay tile (10.8 lbm /ft2, 52.7 kg/m2) Asphalt roll roofing (1.1 lbm /ft2, 5.4 kg/m2) Concrete tile (9.3 lbm /ft2, 45.4 kg/m2) Slate - 1/4" to 3/16 thick (9.1 lbm /ft2, 44.4 kg/m2) Slate - 3/8" thick (12.8 lbm /ft2, 62.5 kg/m2) Slate - 1/2" thick (18.8 lbm /ft2, 91.8 kg/m2) Slate - 3/4" thick (26.0 lbm /ft2, 127 kg/m2) Sheating Materials Plywood None 5/16" thick (1.0 lbm /ft2, 4.9 kg/m2) 3/8" thick (1.1 lbm /ft2, 5.4 kg/m2) 7/16" thick (1.3 lbm /ft2, 6.3 kg/m2) 15/32" thick (1.4 lbm /ft2, 6.8 kg/m2) 1/2" thick (1.5 lbm /ft2, 7.3 kg/m2) 19/32" thick (1.8 lbm /ft2, 8.8 kg/m2) 5/8" thick (1.9 lbm /ft2, 9.3 kg/m2) 23/32" thick (2.2 lbm /ft2, 10.7 kg/m2) 3/4" thick (2.3 lbm /ft2, 11.2 kg/m2) 7/8" thick (2.3 lbm /ft2, 11.2 kg/m2) 1" thick (3.0 lbm /ft2, 14.6 kg/m2) 1 1/8" thick (3.3 lbm /ft2, 16.1 kg/m2) Oriented Strand Board (OSB), Com-Ply 5/16" thick (1.1 lbm /ft2, 5.4 kg/m2) 3/8" thick (1.2 lbm /ft2, 5.9 kg/m2) 7/16" thick (1.4 lbm /ft2, 6.8 kg/m2) 15/32" thick (1.5 lbm /ft2, 7.3 kg/m2) 1/2" thick (1.7 lbm /ft2, 8.3 kg/m2) 19/32" thick (2.0 lbm /ft2, 9.8 kg/m2) 5/8" thick (2.1 lbm /ft2, 10.3 kg/m2) 23/32" thick (2.4 lbm /ft2, 11.7 kg/m2) 3/4" thick (2.5 lbm /ft2, 12.2 kg/m2) 7/8" thick (2.9 lbm /ft2, 14.2 kg/m2) 1" thick (3.3 lbm /ft2, 16.1 kg/m2) 1 1/8" thick (3.6 lbm /ft2, 17.6 kg/m2) Underlayment Materials Asphalt impregnated felt paper None 15 pound paper (0.2 lbm /ft2, 1 kg/m2) 30 pound paper (0.3 lbm /ft2, 1.5 kg/m2) 45 pound paper (0.5 lbm /ft2, 2.4 kg/m2)
None Asphalt roll roofing (1.1 lbm /ft2, 5.4 kg/m2) Asphalt shingle or asphalt-fiberglass composite shingle (2.7 lbm /ft2, 13.2 kg/m2) Metal roofing - aluminum or steel - panel, sheet or shingle (1.2 lbm /ft2, 5.9 kg/m2) Terne plate - copper bearing steel sheet (0.7 lbm /ft2, 3.4 kg/m2) Wood shingle or shake (2.4 lbm /ft2, 11.7 kg/m2) Zinc roofing (1.6 lbm /ft2, 7.8 kg/m2) Copper-asphalt composite shingle (4.2 lbm /ft2, 20.5 kg/m2) Asphalt roll roofing (1.1 lbm /ft2, 5.4 kg/m2) Felt, tar and gravel roofing - 3 ply (4.8 lbm /ft2, 23.4 kg/m2) Felt, tar and gravel roofing - 4 ply (5.3 lbm /ft2, 25.9 kg/m2) Felt, tar and gravel roofing - 5 ply (6.1 lbm /ft2, 29.8 kg/m2) Felt, tar and slag roofing - 3 ply (4.5 lbm /ft2, 22 kg/m2) Felt, tar and slag roofing - 4 ply (4.8 lbm /ft2, 23.4 kg/m2) Felt, tar and slag roofing - 5 ply (5.3 lbm /ft2, 25.9 kg/m2) Ceramic slate (5.8 lbm /ft2, 28.3 kg/m2) Reconstituted slate (4.4 lbm /ft2, 21.5 kg/m2) Clay tile (10.8 lbm /ft2, 52.7 kg/m2) Asphalt roll roofing (1.1 lbm /ft2, 5.4 kg/m2) Concrete tile (9.3 lbm /ft2, 45.4 kg/m2) Slate - 1/4" to 3/16 thick (9.1 lbm /ft2, 44.4 kg/m2) Slate - 3/8" thick (12.8 lbm /ft2, 62.5 kg/m2) Slate - 1/2" thick (18.8 lbm /ft2, 91.8 kg/m2) Slate - 3/4" thick (26.0 lbm /ft2, 127 kg/m2)
Plywood
None 5/16" thick (1.0 lbm /ft2, 4.9 kg/m2) 3/8" thick (1.1 lbm /ft2, 5.4 kg/m2) 7/16" thick (1.3 lbm /ft2, 6.3 kg/m2) 15/32" thick (1.4 lbm /ft2, 6.8 kg/m2) 1/2" thick (1.5 lbm /ft2, 7.3 kg/m2) 19/32" thick (1.8 lbm /ft2, 8.8 kg/m2) 5/8" thick (1.9 lbm /ft2, 9.3 kg/m2) 23/32" thick (2.2 lbm /ft2, 10.7 kg/m2) 3/4" thick (2.3 lbm /ft2, 11.2 kg/m2) 7/8" thick (2.3 lbm /ft2, 11.2 kg/m2) 1" thick (3.0 lbm /ft2, 14.6 kg/m2) 1 1/8" thick (3.3 lbm /ft2, 16.1 kg/m2)
Oriented Strand Board (OSB), Com-Ply
5/16" thick (1.1 lbm /ft2, 5.4 kg/m2) 3/8" thick (1.2 lbm /ft2, 5.9 kg/m2) 7/16" thick (1.4 lbm /ft2, 6.8 kg/m2) 15/32" thick (1.5 lbm /ft2, 7.3 kg/m2) 1/2" thick (1.7 lbm /ft2, 8.3 kg/m2) 19/32" thick (2.0 lbm /ft2, 9.8 kg/m2) 5/8" thick (2.1 lbm /ft2, 10.3 kg/m2) 23/32" thick (2.4 lbm /ft2, 11.7 kg/m2) 3/4" thick (2.5 lbm /ft2, 12.2 kg/m2) 7/8" thick (2.9 lbm /ft2, 14.2 kg/m2) 1" thick (3.3 lbm /ft2, 16.1 kg/m2) 1 1/8" thick (3.6 lbm /ft2, 17.6 kg/m2)
Asphalt impregnated felt paper
None 15 pound paper (0.2 lbm /ft2, 1 kg/m2) 30 pound paper (0.3 lbm /ft2, 1.5 kg/m2) 45 pound paper (0.5 lbm /ft2, 2.4 kg/m2)
1 lbm /ft2= 4.88 kg/m2
Note! - the weight of truss/rafter must be added to calculate the dead load of the roof.
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Temperature oC K oF
Length m km in ft yards miles naut miles
Area m2 km2 in2 ft2 miles2 acres
Volume m3 liters in3 ft3 us gal
Weight kgf N lbf
Velocity m/s km/h ft/min ft/s mph knots
Pressure Pa bar mm H2O kg/cm2 psi inches H2O
Flow m3/s m3/h US gpm cfm
8.21.8
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