radon in new construction

https://radonbasementplus.clearminster.com/posts/understanding-the-risk-of-radon-in-basement-spaces

Radon in new construction is often overlooked, but it's a serious concern because modern, energy-efficient homes can trap this radioactive gas inside. Builders should install proper sub-slab depressurization systems and vapor barriers during the foundation phase, not after. It's way easier and cheaper to prevent radon entry from the start than to fix it later. Testing remains essential even with new systems.