Moved into new (to us, built in 1980) house 2 years ago. Installed an Airthings radon meter a year ago. Levels get up to 400 Bq/m3 when all the windows are closed. Finally had a radon mitigation system installed. Will hopefully get to much safer level below 100 Bq/m3.
Never seen that, but I’m in NW Florida and originally from Tulsa. No radon issues to speak of, especially down here where we don’t have any rocks bigger than pea greavel.
So how does that single port hoover up all the radon, or at least a significant part of it? Still a little lost on that bit. And how does it get through a concrete foundation in the first place? That ain’t sidewalk concrete they pour, it’s thick and fine.
There is always a layer of crushed stone under the concrete slab, so the one port can pull air from underneath the entire slab. Air can always find a way through the concrete, the sump pump pit is a huge hole through the slab that also needs to be sealed.
A large portion of Canada is basically built on solid granite with little dirt. Our own house needed blasting through rock to dig the foundation.