One of the most common aproaches to Radon mitigation is negative pressurization of the under-slab area created by installing a pipe and fan to suck air from beneath the slab.
Occasionally I run into homes which mesure high, but which have a crawlspace which would be a nightmare to try to mitigate... soil floor, stone rubble foundation and log floor framing with log braces down to the floor... forget the soil cloth... impossible to insulate the floor or install a membrane unless you use solid foam in which case forget future structural repairs.
I was wondering, If one could create positive air pressure in the crawl with a blower or fan, would it make much difference in radon levels?
What's the proper term for the pressure of soil-source gas and what's a typical pressure? Has positive air pressure been used for Radon mitigation?