There are various possible roof penetrations, such as vent pipes, ventilation ducts, chimneys, dormers and skylights. All such applications must have a watertight connection with the zinc roofing.
The methods used for ridge abutment, verge flashing attachment and eaves abutment are used here. The sheets should not be fitted too close to the roof penetration. It must be able to expand and contract freely and must also be waterproof.