Hi,
To make it clear, one of my formula was taken from EuroCode 1 and apply to plain perpendicular to the wind. The other one was just my derivation which should work for you better because of units.
The exact given formula was:
g = 1/2 ro * v^2
where ro is an air density and can be safely set to value 1.25 (kg/m^3 - kilograms per cubic meter), so we are getting the formula stated above (pressure = 1.25/2 * speed^2)
This is just basic value and you have to use other formulas to get required/expected figures for designing your roofs and walls.
It is usually something like:
needed_value = g * building_height_factor * shape_geometry_factor * safety_factor
and can be found in your local code.
Michal
