Radon Mitigation Photo Album: Sub Slab Depressurization in McCall, ID

This project involved the installation of an Active Soil Depressurization system for a newly constructed Accessory Dwelling Unit (ADU) with a compact footprint. IdahoRadon was engaged shortly before the garage slab was scheduled to be poured, requiring close coordination with the builder to ensure timely installation of thenecessary sub-slab components. Two primary challenges were addressed during the project. The first involved locating the fan. Given that the ADU is part of a multi-million dollar residence, placing the fan onthe exterior was not acceptable to the client due to aesthetic concerns. Additionally, the original architectural plans called for fully vaulted ceilings throughout the unit. Incollaboration with the builder, a small attic space was created above the utility room to discreetly house the fan, maintaining both functionality and visual integrity.The second challenge was the routing of the exhaust pipe. Located in a high-altitude, snow-prone area, the ideal venting strategy typically involves discharging through agable end. However, due to the vaulted ceilings, this was not feasible. Idaho Radon resolved this by installing the vent pipe near the roof apex, adjacent to a plumbing vent.This placement minimizes visual impact, and the builder’s roofing contractor will complete the final roof penetration and sealing.