TContractor
Report: Exploratory Study of Basement Moisture During Operation of ASD
Radon Control Systems (Revised March 2008)
http://www.epa.gov/radon/pdfs/moisturestudy.pdf
Larainne Koehler
Radon & Indoor Air Coordinator
Radiation and Indoor Air Branch - 25th Floor
US Environmental Protection Agency - Region 2
290 Broadway
New York, NY 10007-1866
212-637-3745
212-637-4942(fax)
For radon information in New York, please call 1-800-458-1158  Option
1 for radon or visit  http://www.nyhealth.gov/radiation
 For radon information in NJ, please call 1-800-648-0394 or visit
http://www.state.nj.us/dep/rpp/radon/index.htm
Radon & Indoor Air information is available from the EPA website at
www.epa.gov/iaq
From:      
 Don Francis
To:      
 RADONPROFESSIONALS@LIST.UIOWA.EDU
Date:      
 04/13/2011 01:06 PM
Subject:    
   Re: [RNPROF]
Humidity--update
Sent by:    
   International
Web Resource for Radon Professionals
Jack Hughes recently completed
a 1-year study on ASD, radon, energy loss and humidity.  The results
were fascinating and damning to ASD and energy waste via indoor air loss.
 Jack, can you jump in here and add to this conversation?  
 
From: International Web Resource
for Radon Professionals [mailto:RADONPROFESSIONALS@LIST.UIOWA.EDU]
On Behalf Of Randy Weestrand
Sent: Wednesday, April 13, 2011 7:32 AM
To: RADONPROFESSIONALS@LIST.UIOWA.EDU
Subject: Re: [RNPROF] Humidity--update
 
Henri
In Nov. 2007 Bill Angell (I think) presented preliminary results of a study
on ASD and basement humidity at conference in Wisconsin.  The report
showed significant increases in basement humidity in some homes at some
times with ASD operating.  The theory was that if significant indoor
air is exhausted (SMD with leaky poly), the lost air is replaced with unconditioned
(humid) outside air, causing significant increases in indoor humidity.
 As I recall, this effect was the opposite of what was expected, and
additional research was planned.  I wish I could post a copy of the
report, but I can't find it.  I suspect that you are seeing that effect
in this home.
 
Randy Weestrand
Radon Removal Inc.
952-476-6226
rweestrand@aol.com
www.fixradon.com
 
 
-----Original Message-----
From: Henri Boyea
To: RADONPROFESSIONALS
Sent: Wed, Apr 13, 2011 8:29 am
Subject: [RNPROF] Humidity--update
Thanks all.
The house has poured concrete foundation walls that never had vents, and
a builder-installed vapor barrier. I find it interesting that the plastic
is sealed high up on the walls, but the floor seams are not sealed. After
5 years, plastic is probably too dirty/dusty to tape seams. Customer is
considering a new, sealed, cross-linked barrier, as she is concerned about
both radon and mold issues.
We agree also that her dehumidifier may not be functioning properly. I
suggested a test to measure water output from the unit, and she had the
idea to shut off the radon system for a few days and see if the crawlspace
becomes less humid, so we are going to check those out. (Just because the
dehumidifier fan is running does not mean the compressor is working.)
What I was wondering was if anyone had done
an install where humidity later increased in the crawlspace as a result
(It doesn't seem logical to me.), or had seen dehumidifiers that ran constantly
but didn't do their job.
Henri Boyea
Radon Control Products
PO Box 6263 , Hendersonville, NC 28793
www.radoncontrolproducts.com
ph/fax (828) 698-4960
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