12″x12″ - 4 (1″) rebar
  axis y-y or x-x plastic timbers
English Metric
Modulus of Elasticity, E 249 180 psi 1 718 MPa
Moment of Inertia, I 1 622 in4 0.000675 m4
Stiffness, EI 4.04E 08 lb-in2 1 160 kN-m2
Maximum Yield Stress in Bending 2 706 psi 18.7 MPa
Weight 40 lbs/ft to 49 lbs/ft 60 kg/m to 73 kg/m
Specific Gravity 0.66-0.80 0.66-0.80
Compressive Modulus, Ec 112 387psi 755 MPa
Distance from Outer Surface
to Reinforcing Elements
1.88 in 48 mm
Reinforcing Element Diameter 1.00 in 25 mm
Number of Reinforcing Elements 4 4
Corner Radius 2.0 in 51 mm
Last Updated: 08.10.04
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12″x12″ - 4 (1.25″) rebar
  axis y-y or x-x composite wales
English Metric
Modulus of Elasticity, E 319 123 psi 2 200 MPa
Moment of Inertia, I 1 622 in4 0.000675 m4
Stiffness, EI 5.17E 08 lb-in2 1 486 kN-m2
Maximum Yield Stress in Bending 3 466 psi 23.9 MPa
Weight 41 lbs/ft to 50 lbs/ft 61 kg/m to 74 kg/m
Specific Gravity 0.67-0.82 0.67-0.82
Compressive Modulus, Ec 142 698 psi 984 MPa
Distance from Outer Surface
to Reinforcing Elements
1.75 in 44 mm
Reinforcing Element Diameter 1.25 in 32 mm
Number of Reinforcing Elements 4 4
Corner Radius 2.0 in 51 mm
Last Updated: 08.10.04
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12″x12″ - 4 (1.375″) rebar
  axis y-y or x-x composite timbers
English Metric
Modulus of Elasticity, E 361 159 psi 2 490 MPa
Moment of Inertia, I 1 622 in4 0.000675 m4
Stiffness, EI 5.86E 08 lb-in2 1 682 kN-m2
Maximum Yield Stress in Bending 3 923 psi 27.0 MPa
Weight 41 lbs/ft to 51 lbs/ft 62 kg/m to 75 kg/m
Specific Gravity 0.68-0.83 0.68-0.83
Compressive Modulus, Ec 160 843 psi 1 109 MPa
Distance from Outer Surface
to Reinforcing Elements
1.69 in 43 mm
Reinforcing Element Diameter 1.38 in 35 mm
Number of Reinforcing Elements 4 4
Corner Radius 2.0 in 51 mm
Last Updated: 08.10.04
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12″x12″ - 4 (1.5″) rebar
  axis y-y or x-x plastic wales
English Metric
Modulus of Elasticity, E 405 684 psi 2 797 MPa
Moment of Inertia, I 1 622 in4 0.000675 m4
Stiffness, EI 6.58E 08 lb-in2 1 889 kN-m2
Maximum Yield Stress in Bending 4 406 psi 30.4 MPa
Weight 42 lbs/ft to 51 lbs/ft 62 kg/m to 76 kg/m
Specific Gravity 0.69-0.84 0.69-0.84
Compressive Modulus, Ec 179 994 psi 1 241 MPa
Distance from Outer Surface
to Reinforcing Elements
1.63 in 41 mm
Reinforcing Element Diameter 1.50 in 38 mm
Number of Reinforcing Elements 4 4
Corner Radius 2.0 in 51 mm
Last Updated: 08.10.04
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12″x12″ - 4 (1.625″) rebar
  axis y-y or x-x structurally reinforced plastic lumber
English Metric
Modulus of Elasticity, E 452 439 psi 3 120 MPa
Moment of Inertia, I 1 622 in4 0.000675 m4
Stiffness, EI 7.34E 08 lb-in2 2 107 kN-m2
Maximum Yield Stress in Bending 4 914 psi 33.9 MPa
Weight 42 lbs/ft to 52 lbs/ft 63 kg/m to 77 kg/m
Specific Gravity 0.70-0.85 0.70-0.85
Compressive Modulus, Ec 200 025 psi 1 319 MPa
Distance from Outer Surface
to Reinforcing Elements
1.56 in 40 mm
Reinforcing Element Diameter 1.63 in 41 mm
Number of Reinforcing Elements 4 4
Corner Radius 2.0 in 51 mm
Last Updated: 08.10.04
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