More often than not roof leaks could have been avoided if code was met and/or enforced. It is important to be educated on current codes for the safety, health and welfare of everyone involved. Making sure that all plumbing vent stacks are up off of the finished roof system, complying with applicable building code minimum requirements. Typically it is spec'd to maintain a minimum of 8" on all VTR's. The video attached shows the most efficient and effective way to do this.
The International Plumbing Code (IPC), requires plumbing vent pipes to extend vertically at least 152 mm (6 in.) above a roof, per Section 905.5, "Vent Connections and Grades." Additionally, vent pipes must be at least 305 mm (12 in.) away from a vertical surface. In locations known for snow, the vent pipe needs to be at least 51 mm (2 in.) in diameter and 305 mm inside an insulated area of a building before extending through the roof. Vents in these locations also should extend 610 mm (24 in.) above a roof.
2010 Florida Building Code, Plumbing 904.1 Roof extension. All open vent pipes that extend through a roof shall be terminated at least 6 inches (152 mm) above the roof and not less than 2 inches (51 mm) above the invert of the emergency overflow, except that where a roof is to be used for any purpose other than weather protection, the vent extensions shall be run at least 7 feet (2134 mm) above the roof.
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