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(OP)
When looking at snow drifts resulting from adjacent separated structures I am having difficulty interpreting two concepts.
1) When using the length of the lower roof in any equation, do you add on the separation distance between the buildings to the "lower roof length".
1a) I would think that the answer is yes to question 1) based on figure C7.7-3 in the commentary.

2) As related to question one. When looking at windward drifting, it seems to be possible that you have a negative actual drift length on the lower roof based on the equations dependency on geometry. Example: The height of the windward drift is based on the projected drift height across the separation "S" (hence my comment in 1a). Since we are allowed to truncate the the drift to the point at the actual building, I would take the actual drift length as 4hd-S, which could produce a negative result. What am I missing here?

### RE: Adjacent Structure Snow Drifting

You are losing us. Please provide a sketch to make your points clear to all, instead for us to jump back and forth between code provisions and this thread.

### RE: Adjacent Structure Snow Drifting

I treat the gap as being part of the lower roof... and cut off the snow drift at the edge of the lower roof...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

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