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SEI wind design example

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For the wind design method: Trial Design Problem: Prob_01_07, found at the web site:
content.seinstitute.org/files/pdf/Sol_Prob_01_07-Final.pdf

On page 4 they show a profile of the wind loads and a shearwall. They neglect the horizontal component of the roof pressures since the reduce the lateral force on the wall. How come they ignore the vertical uplift force from the roof too?

The same is done on page 3.

Since they neglect dead load, perhaps they assume the tow counteract each other.

David Merrick, SE

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