[Greenbuilding] radon question

[David]

Typical detail is to create 1/2" gap and fill with pourable single component urethane caulk. It is self leveling. Clean crack well for better adhesion. Animals can eat foam. Mortar will not withstand building movement. 

David

Sent from my iPhone

On Apr 2, 2012, at 5:22 PM, Clarke Olsen <colsen at fairpoint.net> 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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