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If a basement is sealed can it still test + for radon?

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If a basement is sealed can it still test + for radon? 46erjoe 06-22-2006
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Posted by 46erjoe on June 22, 2006, 10:21 pm
Just bought our home 4 months ago. It tested positive for radon (but
just barely). The seller agreed to install an active radon reducer
fan-type. It runs all the time, sucking air from under the basement
slab. After recent testing, the radon leven was very very low.

I see is that there are many large cracks in the floor. Around the
outside edge runs a gap at least a quarter inch. Then there are
several shrinkage cracks also very large.

If I were to seal every one of these cracks with urethane calk and
thus make the basement airtight, would the radon problem go away?

Or can radon leach through concrete block and floors? I sure would
like to shut off that noisy 24-7 fan and convert it to a basement
bathroom vent to the outside.

Posted by on June 22, 2006, 10:24 pm

46erjoe wrote:
> Just bought our home 4 months ago. It tested positive for radon (but
> just barely). The seller agreed to install an active radon reducer
> fan-type. It runs all the time, sucking air from under the basement
> slab. After recent testing, the radon leven was very very low.
>
> I see is that there are many large cracks in the floor. Around the
> outside edge runs a gap at least a quarter inch. Then there are
> several shrinkage cracks also very large.
>
> If I were to seal every one of these cracks with urethane calk and
> thus make the basement airtight, would the radon problem go away?
>
> Or can radon leach through concrete block and floors? I sure would
> like to shut off that noisy 24-7 fan and convert it to a basement
> bathroom vent to the outside.


If you could cure radon with a caulk gun, do you think people would be
installing systems like the one you have?


Posted by buffalobill on June 22, 2006, 10:43 pm
no, the problem will continue.
radon is unhealthy so only replace the noisy fan with a quiet one.
search for radon at energy federation:
http://www.energyfederation.org/consumer/default.php/cPath/30_406_1304

46erjoe wrote:
> Just bought our home 4 months ago. It tested positive for radon (but
> just barely). The seller agreed to install an active radon reducer
> fan-type. It runs all the time, sucking air from under the basement
> slab. After recent testing, the radon leven was very very low.
>
> I see is that there are many large cracks in the floor. Around the
> outside edge runs a gap at least a quarter inch. Then there are
> several shrinkage cracks also very large.
>
> If I were to seal every one of these cracks with urethane calk and
> thus make the basement airtight, would the radon problem go away?
>
> Or can radon leach through concrete block and floors? I sure would
> like to shut off that noisy 24-7 fan and convert it to a basement
> bathroom vent to the outside.


Posted by on June 23, 2006, 4:33 am
46erjoe wrote:

> If I were to seal every one of these cracks with urethane calk and
> thus make the basement airtight, would the radon problem go away?

It might, if there were a vapor barrier under the slab.

> Or can radon leach through concrete block and floors?

Sure, but you might put poly film on the floor with carpet over that
and poly film on the walls with foamboard over that.

Nick


Posted by mm on June 23, 2006, 10:19 am
wrote:

>no, the problem will continue.
>radon is unhealthy so only replace the noisy fan with a quiet one.

Is this a case where a squirrel cage fan would be better because it
is, aiui, quieter? Or is their capacity too low? Or some other
problem.

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