What is the primary objective in sub-membrane systems?

The primary objective in sub-membrane systems is to break the connection between soil and air. This is achieved by installing a vapor barrier or membrane under the floor slab, which effectively seals off the soil from the living spaces above. By creating this barrier, any radon gas or other soil gases present are prevented from migrating into the home, thereby reducing potential exposure to harmful contaminants.

This function is particularly important in radon mitigation, as radon is a colorless, odorless gas that can accumulate in enclosed spaces due to its natural occurrence in soil. By interrupting the pathway that allows these gases to enter the building, sub-membrane systems significantly decrease the radon levels, consequently enhancing indoor air quality.

While some of the other options may pertain to general issues of residential health and safety—like humidity levels, air quality enhancements, or water accumulation prevention—the central aim of sub-membrane systems focuses on soil gas intrusion mitigation.