What is a significant obstacle when installing a block wall depressurization system?

A significant obstacle when installing a block wall depressurization system lies in the presence of finished walls covering basement block walls. Such finishing can hinder access to the block walls needed for proper installation and operation of the system. The depressurization system is designed to create a pressure differential that draws radon gas out of the block walls and away from the living space. When walls are finished, the installer may have to deal with additional complexities, such as removing drywall or other materials, which can add to the time, cost, and labor involved in the installation process.

Furthermore, finished walls impede the ability to assess and connect to the necessary components of the depressurization system effectively. Proper installation requires clear access to the block structure for effective sealing and venting, which is compromised when the walls are finished. This situation can also complicate compliance with building codes and ensure a professional appearance post-installation.

In contrast, while other options such as humidity levels or insufficient drainage systems may pose challenges in radon mitigation, they do not specifically restrict the installation process in the same direct manner that finished walls do. Lack of ventilation, while important for air quality, also does not prevent an installation but rather may impact the system's efficacy once installed.