Sample House

 

ROOF LEVEL

 

Ceiling

• dimensions
  • sqft
• dead load
  • pressure
    • insulation: 14" fiberglass = 0.5 x 14 = 7 psf
    • ceiling joist: 2x8 at 16" OC = 1.6123 psf
    • drywall: 5/8" gypsum board = 5 x 5/8 = 3.125 psf
    • D = 11.8 psf
  • load to joist
    • A_T = 16 in. (1 ft/12 in.) x (14 ft) = 18.67 ft²
    • w_D = 11.8 psf x 16 in. (1 ft/12 in.) = 15.73 lb/ft
  • load to stud in interior wall
    • A_T = 16 in. (1 ft/12 in.) x (7 ft) x 2 sides = 18.67 ft²
    • P_D = D A_T = 220.3 lb
  • load to stud in exterior side wall
    • A_T = 16 in. (1 ft/12 in.) x (7 ft) = 9.333 ft²
    • P_D = D A_T = 110.1 lb
• live load
  • pressure
    • L₀ = 10 psf  (uninhabitable attics without storage, ASCE 7 table 4-1)
  • load to joist
    • A_T = 16 in. (1 ft/12 in.) x (14 ft) = 18.67 ft²
    • w_L = 10 psf x 16 in. (1 ft/12 in.) = 13.33 lb/ft
  • load to stud in interior wall
    • A_T = 16 in. (1 ft/12 in.) x (7 ft) x 2 sides = 18.67 ft²
    • P_L = L A_T = 186.7 lb
  • load to stud in exterior side wall
    • A_T = 16 in. (1 ft/12 in.) x (7 ft) = 11.00 ft²
    • P_L = L A_T = 110.0 lb
• snow load
• wind load
• seismic load
• deflection limits  (IBC table 1604.3)
  • supporting nonplaster ceiling
  • L/240 for L = 14 ft x 12in./ft / 240 = 0.7000 in.
  • L/240 for S or W = 14 ft x 12in./ft / 240 = 0.7000 in.
  • L/180 for D + L  (or L + 0.5D if under dry conditions) = 14 ft x 12in./ft / 180 = 0.9333 in.