A roof penetration is a location where a pipe, duct or other component passes through the roof assembly. The connected system’s purpose and its waterproof junction are separate but related questions. The shape of a terminal does not always establish its function.
Record which installation belongs to the penetration and who manages it. Roof renewal may require coordination of relocation, sealing and checking. A roofing instruction does not automatically include work on the installation, so identify responsibilities clearly before execution is planned.
The appropriate detail depends on actual shape, materials and the selected assembly. This explanation specifies no universal collar or installation technique. Ask for a proposal considering the roof and connected component together without treating an unidentified function as proof that an item is redundant.
Worth asking
Frequently asked questions
Can every pipe be sealed in the same way?
No. Shape, material and system need to suit the connection.
Can an unidentified penetration be removed?
Clarify function and ownership first. Unidentified does not mean redundant.