'<h3>Example - Net factored wind uplift calculation per NBCC 4.1.7.1(3)</h3>

'<h3>Information</h3>

' Importance factor - ,'I_w = 1.0
' Hourly wind pressure - ,'q = 7.93' psf
' Height of the building - ,'h = 22'ft


'<h4>Interior Pressure Calculations</h4>

C_ei = 0.9' (Open Terrain)
C_gi = 2.0
C_pi_max = 0.30
C_pi_min = -0.45

'Maximum Interior building pressure (+ = Upward Load on Roof)
P_i_max = I_w*q*C_ei*C_gi*C_pi_max' psf

'Minimum Interior building pressure (- = Downward Load on Roof)
P_i_min = I_w*q*C_ei*C_gi*C_pi_min' psf


'<h4>Exterior Pressure Calculations</h4>

C_e = 0.923
CpCg_max = 0.30' (from Commentary figure I-9)
CpCg_min = -1.50' (from Commentary figure I-9)

'Minimum exterior building pressure (- = Upward Load on Roof)
P_e_min = I_w*q*C_e*CpCg_min'psf 

'Maximum exterior building pressure (+ = Downward Load on Roof)

P_e_max = I_w*q*C_e*CpCg_max'psf 



'<h3>Net factored wind uplift calculation</h3>

'Maximum wind pressure on roof- 'P_max = P_e_min - P_i_max'psf

'Dead load on the roof - ,'DL = 20'psf


'Factored net uplift,'P_f_uplift = 0.9*DL + 1.4*P_max'psf