Flashings and penetrations account for nearly 80 percent of all reported roof leaks. Therefore these areas are perhaps the most critical components of any roof system, but they are particularly important when it comes to low-slope standing seam metal roof systems.
The flashing element is the most vulnerable part of any roof system because it is the point at which the horizontal roof deck and vertical surface join. It is also the intersection of two different materials, such as is the case with parapet walls.
Prefabricated roof curbs have been in use since the roof has been utilized for something other than keeping weather out. And in this one sentence lie the benefits and the detriments we face in the roof curb business everyday. The primary function of the curb is to keep weather out while supporting/flashing the equipment on it.
