I am trying to determine the wind pressure on the sidewalls and the wind pressure on the endwalls of my structure which looks like the structure in image 1, meaning there is only 4 walls. The structure is a hay storage shed with length of 167', width of 60', height of 14.5' (~4.5 m). Since the height is less than 20m, it is classified as a "Low Building" according to OBC. Is it correct to use the C_p*C_g values for 5 and 6 for the endwall wind pressure and the C_p*C_g values of 1 and 4 for the sidewall? Note that the values are shown on the second image in the slideshow. Also, I know that I am supposed to take the difference of the windward and leeward values of C_p*C_g when computing the wind pressure using the equation from the OBC shown below, but how do I know which is windward and which is leeward? Here is the equation from the OBC I am using to compute the wind pressure: