Agreed Terry...coming from the mitigators angle, I still look at using multiple test kits and/or a CRM to define things before and after. I always test where the original data was developed and then anywhere I think useful. In this case and in light of the attic exhauster, a CRM and long term test with another visit to check in winter data may serve the home occupants and high end builders. The pressure change potentials and WorstCase would be interesting data to gather as part of a CRM test and could explain results or uncover existing combustion spillage. . In a another world, Jack BartholomewSent from my HTC on the Now Network from Sprint!----- Reply message -----From: "Terry Howell" Date: Wed, Jun 8, 2011 12:06 pmSubject: [RNPROF] Post mitigation testingTo: TimTo the best of my knowledge, I have never used this forum to offer or try to sell anything to anyone, and if I were going to I would reply privately, not publicly. I do not appreciate your inference; you asked for advice/opinions and you got it. Terry E. Howell, PresidentRadalink, Inc.thowell@radalink.com770-457-1944 -----Original Message-----From: Tim Pittman [mailto:timpit@charter.net] Sent: Wednesday, June 08, 2011 11:14 AMTo: Terry HowellCc:RADONPROFESSIONALS@LIST.UIOWA.EDUSubject: RE: [RNPROF] Post mitigation testing Yes, that is the obvious solution, to do 2 tests, one in the conditioned area and one where the original test was placed in the unconditioned mech. room. Although I am sure you would be glad to sell me several, since I am primarily in the mitigation business I don't have a whole closet full of monitors on hand, just two and one will be tied up elsewhere at the time....so I guess I could do charcoal for one room and continuous for the other room.....I do not have the time or luxury of re-testing prior to activation of the system, and neither the seller or the purchaser is willing to pay for it, if I did have the time. An aside is that it will be interesting to see a monitor graph of the radon levels....the current owner has installed a HUGE gable end mounted attic fan to exhaust the heat from his attic....I mean huge....you could power a swamp buggy with this thing.....it is permanently mounted and hard wired with a thermostat/timer control to come on 3 times a day for 30 minutes (if the temp is above a set level)....I am sure if you could measure it you would see the house exterior walls bow in from the negative pressure when this thing comes on.......which actually brings up another point/question....I consider this fan a part of the house mechanical system since it is permanently mounted and does not "plug in" or turn on with a switch like a ceiling fan, and since it automatically comes on without human input......but on the other hand....should this thing be disconnected or disabled some way for testing....I don't think so, since it is currently being used, was in use for the original testing, and since I cannot remove it or in some way prohibit the future owner(s) from using it........but on the other hand, just how big an obstacle is a mitigation system expected to overcome ?? I guess that's why I like this business...nothing is ever the same, every day is an adventure, and Sherlock Holmes ain't got nothing on me.....other than he aint broke.On Wed, Jun 8, 2011 at 9:27 AM, Terry Howell wrote: I think you should test in the original location unless you have reason to suspect the finished area would be higher, in which case you should test both. This is the only way you can assure the home is safe for ALL future occupants. Terry E. Howell, President Radalink, Inc. thowell@radalink.com 770-457-1944 -----Original Message----- From: International Web Resource for Radon Professionals [mailto:RADONPROFESSIONALS@LIST.UIOWA.EDU] On Behalf Of Tim Pittman Sent: Wednesday, June 08, 2011 9:13 AM To: RADONPROFESSIONALS@LIST.UIOWA.EDU Subject: [RNPROF] Post mitigation testing Need some opinions/advice: Have been called to do an activation of an existing "passive radon system" installed by the original homebuilder. The activation is the result of a 4.3 pCi/L test result, preformed by a private home inspector as part of a real estate transaction. I do not know who the inspector is, but I strongly suspect he/she is not a certified radon tester. It is a one story home over a full basement that is 80% finished. The finished/conditioned portion of the basement includes a bedroom, bathroom, another bedroom being used as an office and junk room, and a large central rec room/den. There is an 12 X 14 unfinished, unconditioned mechanical and storage room off the main rec room. This room is separated by a weatherstripped door and insulated walls. Although the mechanical/storage room has no window and therefore could not technically be used as a future bedroom, the room theoretically could be finished off and used as some sort of room in the future. For reasons that elude me, the original home inspector/radon tester placed his test in this unfinished, unconditioned mechanical/storage room. The seller/current occupant told me he thought the tester placed the test in that room because the inspector there may be too much activity or opening and closing of doors in the main basement area. The post mitigation testing is supposed to be conducted in the same place as the original testing. I think the original test should have been placed in the rec room or the bedroom (even thought the argument could be made that somebody may finish the storage room in the future). So my question********** RN PROF (Subscription changes - archives) - http://list.uiowa.edu/scripts/wa.exe?SUBED1=RADONPROFESSIONALS&A=1 ***********