[Greenbuilding] radon question

Michael O'Brien obrien at hevanet.com
Mon Apr 2 17:07:07 CDT 2012


Hi, Clark--

Radon gas cannot go through solid material, it must be transported in air, so whatever will form a tight air seal will block off radon.

Mike O'Brien



On Apr 2, 2012, at 2:22 PM, Clarke Olsen wrote:

> 
> A ground floor room tests positive for Radon - not high, but more then nothing.
> The floor is 4+" of concrete on 2" ext. styrofoam, on 6 - 8" of gravel.
> Big (1/2") joint between foundation and slab is the likely source.
> Should I: 
>                 a) seal-up the joint with non-shrinking mortar?
>                 b) seal it with expanding foam? With caulk?
>                 c) arrange some form of fat baseboard vent?
> 
> Clarke Olsen
> 373 route 203
> Spencertown, NY 12165 
> USA
> 518-392-4640
> colsen at fairpoint.net
> 
> 
> 
> 
> 
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