A collar is a component of a vent pipe flashing that is used to provide a secure and watertight seal around the vent pipe. The collar is typically made from a flexible material, such as rubber or neoprene, and is designed to fit snugly around the pipe to prevent water infiltration and other types of damage.
The collar is typically installed over the vent pipe, and is secured in place using adhesive or other fastening methods. The collar is then covered with a layer of flashing material, such as metal or asphalt, which is designed to direct water away from the vent pipe and provide additional protection against the elements.
Proper installation and maintenance of collars is an essential part of the overall installation and maintenance of the roof system. Collars must be properly sized and installed to ensure a secure and watertight seal, and must be regularly inspected and maintained to ensure that they remain in good condition.
Overall, collars are an important component of vent pipe flashing, and can help to prevent water infiltration and other types of damage to the roof system. Proper installation and maintenance of collars can help to ensure the continued durability and performance of the roof, and can provide peace of mind for building owners and occupants.