Radon mitigation question

[Terence McCann]

I tested a home where the final reading was 15.8.

The home had a small basement with crawl spaces on either side. The crawl spaces had dirt floors. Question is what method would they use to mitigate the home? All the ones I have seen deal with a standard basement with a concrete floor, vent pipe under the floor etc.

[Bain]

I'm no expert, but around here they install a heavy vapor barrier on the crawlspace floor and then use construction adhesive to glue the plastic to the foundation walls and to seal the seams. I doubt the system is ever completely airtight, but with the fan running, negative pressure prevents the migration of radon into the living space of the house.

[Bill Kibbel]

In addition to the plastic, described above by Bain, the piping from the radon mitigation system is usually extended under the plastic.