Condominiums can be one of the most difficult types of buildings to mitigate. This isn’t due to construction complexity, but the number of owners involved within each building. Condo buildings are typically in units... and owners, of two to eight per building.
Because each building is typically one or two stories tall, they are usually built similar to single-owner houses, with one outside wall footing, and one set of common drain-tiles running to one… to multiple sump crocks. Because of this, the condo “building” must get mitigated to protocol, sealing all floor cracks and sump crocks air-tight. There is never a “singular” dealing with “an owner” in these mitigations. Instead, all owners within the building must agree to the mitigation, and cooperation to enter and work on each unit within the building is necessary. The more owners within each building, the more problematic the mitigation’s time-line becomes.
Some owners are “never home”, some don’t believe in “radon”… thus not wanting their unit worked on, and in some cases, they support the work but don’t want to take on any costs for the work. All of this can take a simple radon mitigation and add huge amounts of hours to the project.
Mitigation systems on a condo building can impact one unit, multiple units, or the entire building. In general, one typical mitigation system is needed per every two to three condo units depending on the number of square feet per unit, and the height of the initial radon readings.