Wind and Snow Loading

Dynamic Wind Pressure
The wind speed is used to determine the actual loading upon the glazing panels. In mathematical terms, the pressure loading is calculated by multiplying the square of the design wind speed by 0.002531

q = KV²

where q = dynamic wind pressure in lb-force/ft²
K = 0.002531
V = design wind speed in mph

Fig. 38

Values of q in SI units (lb-force/ft² )
wind speed mph	wind pressure lb-force/ft²	wind speed mph	wind pressure lb-force/ft²
20	1.04	150	56
30	2.50	170	72
50	6.00
70	12.00
100	25.00
120	36.00
For glazing projects with an unusual loading condition, please contact MJK Multiwall Systems or Orca Manufacturing

Pressure Coefficient
To allow for local fluctuations in the acceleration/deceleration of the wind by building or glazing geometry, it is necessary to include an appropriate pressure coefficient. The wind loading is obtained by multiplying the dynamic wind pressure by the pressure coefficient. Detailed pressure coefficient values can be found in the appropriate National Building Norms.

Snow Loading
Snow loadings on roof glazing shall be considered equivalent to a vertically, uniformly distributed load, acting per m² of the horizontal projection of the glazing. Snow loading factors can be obtained from the appropriate local building norm.

Point Fastening

Positive and negative loads must be taken into account while being mindful of the Expansion and Contraction of varying gauges of sheet and the type of system being installed. - i.e. Length of Sheet, edge bite type and color of system,