In a home with both a crawl space and a basement, which mitigation approach is the most cost-effective?

The most cost-effective mitigation approach in a home with both a crawl space and a basement involves implementing sub-slab depressurization and sub-membrane methods linked together. This method efficiently reduces radon levels by creating a vacuum effect beneath both the slab and the membrane that covers the crawl space. By utilizing these combined techniques, radon is effectively drawn out from both areas, reducing the overall levels significantly.

This approach is beneficial because it addresses the potential radon sources simultaneously, which is particularly important in homes where radon can enter from multiple areas. The linked sub-slab and sub-membrane methods capitalize on the same mitigation system, reducing redundancy in equipment and installation costs. Effectively addressing both spaces at once can often yield a better overall result than focusing on just one area.

The other methods, while potentially effective in isolation, may not provide the same comprehensive results or cost efficiency when treating a home that has both crawl spaces and basements. For instance, focusing on just crawl space depressurization or using separate vent systems could lead to higher operational costs and may not sufficiently address radon issues in both structural components of the home. Sealing all openings in the foundation might reduce radon entry, but it does not actively mitigate existing radon