hardwoods in the basement?????

[Guppy]

Glue down carpet with 4" holes for putting ⛳️

[Sea Dangles]

I put berber in my basement,it has worked out great. tile in the bathroom

[Raven]

i used to be an installer.........

Radon gas is like having a cigarette smoker in the house
where you are inhaling second hand smoke so it's
considered to be just as carcinogenic ....

to lower Radon Gas 4 points you can core thru the cellar wall
with a 4 inch bit and then install a fresh air inlet because even the furnace needs oxygen... if your only a few points away from the goal
then re-test

As far as floor materials go ...consider your worst case scenario.
there is a foot of standing water down there.... now what?
what will it take to get back to normal and how fast.

keep in mind that carpets often have chemicals like formaldehyde
in them when your comparing different floor coverings for price.

[Fly Rod]

Raven: I always told people to leave a basement window opened.

[Raven]

people can crawl thru an open basement window

but they won't get in thru a 4 inch hole