The reasons for roof penetrations are numerous: roof vents, electrical conduit, utility pipes, satellite dishes, HVAC curbs, lightning protection. Where possible, flashings should extend a minimum of eight inches above the finished roof surface. In the past, using pitch pockets or pitch pans around penetrations was a common practice, especially on modified bitumen and built-up roofs. This method involved installing a 2-inch high flanged open-top metal box placed around the penetration, mechanically fastening it to the roof and filling it with non-shrink grout.
Roof penetration device
Keep Roof Watertight Despite Structural Penetrations in Metal Panels : MBCI Blog
That means an opening is cut in the metal roofing, it is properly flashed or sealed, and the penetrating member is passed through it. However, some penetrations are already in place before the roofing contractor shows up. These can be things like vertical members resting on the building structure that support a platform for HVAC equipment above the sloped roof. Or, it can be parapet wall with offsets or other conditions that are already in place. In cases like this, a different approach is needed to assure that the roof remains watertight. From the standpoint of a roofer, a structural equipment platform is a pre-existing condition. The metal roofing industry already recognizes the need to address such situations, particularly on existing buildings, by offering retrofit flashing and curb products.
Know Your Roof Penetrations
We offer ALL types of pipe flashing systems, roof penetration flashing and sealing solutions. Email Sales bestmaterials. These rubber flashing boots are easy-to-use and feature a 20 year manufacturers warranty. For service entrance flashing, use Retro-Spin flashing Kits.
On the surface, the idea of adding equipment to a roof without penetrations sounds pretty good. Keep reading to see why this may be the wrong approach It is understandable that people hate roof penetrations and try to avoid them at all cost. But instead of simply avoiding roof penetrations altogether, consider that if done properly, those painful leaks can be eliminated and rooftop equipment can be mounted securely. In fact, roofs are full of penetrations.