For typical drifts, I agree that both types just taper to zero.
The code wording that I'm questioning is talking about the special condition where the lower roof width is narrower than the calculated drift width. In my case, the 5' canopy width is narrower than the calculated leeward drift...
I agree that a narrow canopy like this one would never see a windward drift.
My question is about the sentence in quotation marks regarding drifts on lower roofs tapering to zero. Does this refer to windward or leeward drifts on lower roofs?
I am trying to decipher the changes in ASCE 7-16 section 7.7.1 mentioned by DaveAtkins above as related to a canopy attached to a building.
I'm designing a project with a 5' wide canopy. It has a leeward drift from the upper roof. The calculated drift height would be about 3.6'.
The max...