How can radon movement through the hollow cores of block in a concrete block foundation wall be prevented?

Preventing radon movement through the hollow cores of blocks in a concrete block foundation wall can be effectively achieved by sealing the cores. This method is critical because radon, a radioactive gas that can pose health risks, can migrate through these voids in the blocks. When the cores are sealed, the pathways for radon gas to infiltrate the living space are eliminated, reducing the concentration of radon indoors.

Sealing the cores can involve using specific materials that block or fill these voids, creating a barrier that inhibits gas movement. This solution not only addresses the radon entry from the foundation but can also enhance the overall integrity and energy efficiency of the structure.

While plastic sheeting, ventilation systems, and insulation can provide benefits in terms of moisture control, air quality, and thermal regulation, they do not specifically target the movement of radon gas through the block cores as effectively as sealing does. Thus, sealing the cores remains the most direct and efficient approach to mitigating radon intrusion in this scenario.