1/27/2015 – Structural Design

Overall

  • Width to be 24 feet.
  • Joist/stud/rafter spacing to be 24″ on center.
  • Comply with IRC 2012.
  • Spruce-Pine-Fir (south) worst case scenario for available species.

First Floor Joist

  • Grade No. 2 or better
  • Size 2×12
  • Live Load 40 psf
  • Dead Load 20 psf
  • Modulus of Elasticity (E) 1100000 psi
  • Bending Strength (Fb) 891.25 psi
  • Bearing Strength (Fcp) 335 psi
  • Shear Strength (Fv) 135 psi
  • The Maximum Horizontal Span is: 12 ft. 6 in. with a minimum bearing length of 1.49 in. required at each end of the member.
  • Ceiling n/a
  • Sub-floor 3/4″ (nominal) 48/24 plywood
  • Underlayment ? plywood or ? particle board

Second Floor Joist

  • Grade No. 2 or better
  • Size 2×10
  • Live Load 40 psf
  • Dead Load 10 psf
  • Modulus of Elasticity (E) 1100000 psi
  • Bending Strength (Fb) 980.38 psi
  • Bearing Strength (Fcp) 335 psi
  • Shear Strength (Fv) 135 psi
  • The Maximum Horizontal Span is: 11 ft. 10 in. with a minimum bearing length of 1.18 in. required at each end of the member.
  • Ceiling 1/2″ sheetrock
  • Sub-floor 3/4″ (nominal) 48/24 plywood
  • Underlayment 1/4″ plywood or 1/2″ particle board

Ceiling Joist

  • Grade No. 2 or better
  • Size 2×8
  • Live Load 20 psf
  • Dead Load 10 psf
  • Modulus of Elasticity (E) 1100000 psi
  • Bending Strength (Fb) 1069.5 psi
  • Bearing Strength (Fcp) 335 psi
  • Shear Strength (Fv) 135 psi
  • The Maximum Horizontal Span is: 12 ft. 6 in. with a minimum bearing length of 0.75 in. required at each end of the member.
  • Ceiling 1/2″ sheetrock

Rafter

  • Grade No. 2 or better
  • Size 2×8
  • Snow Load 20 psf
  • Dead Load 10 psf
  • Modulus of Elasticity (E) 940500 psi
  • Bending Strength (Fb) 983.94 psi
  • Bearing Strength (Fcp) 224.45 psi
  • Shear Strength (Fv) 120.47 psi
  • The Maximum Horizontal Span is: 12 ft. 0 in. with a minimum bearing length of 1.07 in. required at each end of the member.
  • Decking 5/8″ (nominal) 40/20 plywood
  • Decking Fasteners 8d ringshank, 6″ oc at the edge, 12″ oc in the field.

Exterior Walls

  • Studs 2×6 @ 24″
  • Bottom Plate 2×6
  • Double Top Plate 2×6
  • Exterior Sheathing 1/2″ (nominal) 32/16 plywood
  • Fasteners 8d ringshank, 6″ oc at the edge, 12″ oc in the field.
  • Interior Sheathing 1/2″ sheetrock

Basement Foundation

  • Footer 2×8
  • Studs 2×6 @ 12″
  • Bottom Plate 2×6
  • Double Top Plate 2×6
  • Sheathing 5/8″ (nominal) 40/20 foundation grade plywood

Basement Floor

  • Sleeper
  • Joist
  • Sub-floor

AWC Span Calculator

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Posted in Daily, House

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