On Jul 18, 5:18*pm, " wrote:
did OP ask this question awhile ago before doing all the floor work?
someone did and was told radon should be fixed before finishing space.

too many want look pretty befor fixing key essentials. like laminate
flooring in a basement that only takes in water every few years.

If you have access to under your home from outside, a electric drill
with extensions can drill a one inch hole 20 feet easily, and 40 feet
with patience. if the home sits above grade drill some holes, leave
dug area open and see if radon levels drop.

radon is heavier than air, and should naturally migrate out the holes

so how much are the mitigation estimates?
to the op

your stratagy should be to INCREASE the air pressure in the lower part
of your house (i.e. pump IN fresh air) and try to LOWER it under the
floor..

You want to try to get that air moving the opposite direction.

Anything that consumes air in your home such as the furnace or dryer
or an exhaust fan is lowering the air pressure inside and is working
against you.

Mark