There are earlier entries also about roof inspections and maintenance.
We do lose precious time and suffer from stress due to roof leaks that lead to consequential damage to equipment and systems in many of our industrial and office facilities. The linked article is more pertinent to industrial facilities having sheet roofs.
It is a good practice to inspect roofs twice a year and do essential maintenance periodically. It is even more essential to inspect roofs before an impending storm and after the storm has cleared.
The article linked this time is from September 2010 issue of Building Operating Management magazine.
Roof inspection and maintenance will require specialised personnel, safety precautions, permits and supervision.