How high above the roof level should vent terminals be placed?

The appropriate height for vent terminals is critical for ensuring proper venting of plumbing systems and preventing issues such as backdraft or water ingress that can occur if vents are too low. The correct standard states that vent terminals should be positioned at least 6 inches above the roof level. This height helps to ensure that the vent doesn’t get blocked by snow or ice and allows for adequate airflow away from the building.

In cases where the roof is utilized for other purposes, such as a deck or walkway, the requirement increases to a minimum of 7 feet. This additional height helps to ensure that the vent terminals are safely clear from any potential obstructions or interference from activities on the roof, thereby maintaining their effectiveness in venting plumbing gases and odors away from inhabited space.

This comprehensive approach addresses both the general requirements and specific conditions that may arise based on roof usage, making it the best practice for plumbing vent terminal installation.