If the ASD piping is attached to a building, how high must the exhaust extend above the roof edge?

The requirement that the exhaust piping from an Active Soil Depressurization (ASD) system must extend not less than 6 inches above the roof edge is grounded in ensuring that any potential radon or other harmful gases that may be vented from the system are effectively dispersed away from the building. This clearance helps to prevent the possibility of these gases re-entering the building through windows, doors, or other openings that may be present near the roofline.

By maintaining this height, it also assists in avoiding any interference with potential airflow around the building, which could hinder the chimney effect that helps draw gases away from the foundation. Additionally, the 6-inch minimum height is typically regarded as sufficient to mitigate the risk of downdrafts or other environmental factors that could impede the proper functioning of the ventilation system.

Complying with this height requirement is vital for the safety and health of the building's occupants as it ensures that radon is effectively vented away from the living spaces.