Yes — radon passes right through concrete. It moves through cracks, control joints, and the natural microscopic pores in the slab. A basement floor that looks completely solid is not a radon barrier.
Why Sealing Alone Isn't Enough
Filling visible cracks helps, but it can't close the millions of tiny pores in the concrete or stop gas from entering around the slab edges and utility penetrations. Soil gas is under constant pressure, and it will find every available path.
What Actually Works
A sub-slab depressurization system doesn't try to seal the slab — it reverses the pressure. A fan creates suction in the gravel beneath your floor so radon is pulled out and vented above the roofline before it can rise through the concrete. Sealing cracks and the sump pit makes that system even more efficient.
Test Your Home
A radon test tells you if gas is getting through. Get a free quote or call (330) 555-8201.