Rob Claus provides important reminders on what to keep in mind when inspecting roof drains during a commercial property inspection.
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Thanks for the pointer, Rob.
The 4th way is to drain off the roof. Frequently done in my area if there is parking lot, street or ground drains.
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I concur, Dan. Working with commercial roofing contractors they always removed water with a pump and hose running to the parking lot sewer. Then if a repair was implemented sawdust was used to dry the membrane and torched dry at the end.