combinations. Remember the old 1/2Wind + Snow and Wind +1/2 Snow? This has
been replaced by the simpler 0.75Wind + 0.75Snow (or 0.75 Lr). For the
low-landers who do not have big snow storms, I have personally been involved
with a number of buildings where the roof drains plugged (wind borne debris)
and the roof filled with water while the wind was howling. I have also seen
several projects where roofing materials were stacked on a roof (rafter
component live load), and remained there throughout a windstorm, because the
roofers were smart enough to stay off the roof during the storm.
Dmitri Wright, PE
Cascade Engineering, Inc.
2459 SE TV Hwy, PMB #202
Hillsboro, OR 97123-7919
dmitri@cascade-structural.com
503-846-1131
>Who/what is on the roof causing live load during a wind event I ask?
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