ASCE 7 restricts the affects of drift from adjacent structures to within 20 feet of higher structures. This seems to be only a horizontal limitation and they place no restriction on vertical distance. There must be a point where drift from a higher structure will diffuse in the same wind event that causes the drift before it reaches a low roof. But I am not familiar with any literature that addresses this topic. Does anyone know of any reports or data to confirm or deny my theory? I am working on a building that is lower than an adjacent building by approximately 10 stories so I think it might be a judgement call if there is no definitive resources available.
Thanks,
Jeremy
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