Plastic collar

Plastic collars are designed to create a watertight seal around rooftop penetrations, such as vent pipes, exhaust pipes, or flues. They are flexible and adjustable sleeves that wrap around the penetration, providing protection against water intrusion. When installing a plastic collar for a rooftop penetration on a metal roof, it is typically placed directly around the penetration itself. The collar creates a tight seal around the pipe or vent, preventing water from entering the roof through that specific penetration. Plastic collars are installed directly around rooftop penetrations, while flashing products like Master Flash are used to create a seal over the penetration and integrate with the roof. The two are often used in combination to provide robust protection against water intrusion at roof penetrations.