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  #1  
Old 7/30/17, 10:05 AM
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Default Mold testing: 1 or 2 outdoor control samples?

Hi y'all,
I just completed the training on mold testing and recall that 2 control samples were taken outside (1 windward and 1 leeward). I haven't done any professional tests yet, but while researching what other companies do here in my local market of the Denver Metro area of Colorado, I see that some companies use a SOP of just 1 outdoor control. What am I missing, or are they doing it wrong?

Thanks in advance.
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  #2  
Old 8/1/17, 6:36 PM
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Default Re: Mold testing: 1 or 2 outdoor control samples?

Nobody wants to answer this? let me get more specific. IAC2 guidelines state unequivocally that 3 air samples shall be taken (2 outside and one inside)

Axium Inspections who is IAC2 and InterNACHI accredited, states on their website that "We will have to take a minimum of two mold air samples: one mold test indoors and one mold test outdoors as a control."

Mold Inspection & Testing, another company who operates in Denver and is also IAC2 certified, states on their website: Residential: $300-350 (Location Dependent) includes inspection, reports, and 2 Mold Tests (1 Control, 1 Inside)

I'm not trying to be a dumbass - this seems like a very basic question that has to have a definitive answer.

Are they just blowing QA out the window, or just undercutting everyone by offering less?
Thanks for anyone who can help me with this.
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  #3  
Old 8/1/17, 6:40 PM
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Default Re: Mold testing: 1 or 2 outdoor control samples?

There are no "official" guidelines. So I guess you're free to make up your own SOP. The EPA




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  #4  
Old 8/1/17, 6:47 PM
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Default Re: Mold testing: 1 or 2 outdoor control samples?

IAC2 is about the only org that recommends 2 outside control samples. The most important decisions with the control sample are location and weather conditions that would render the sample useless. Maybe that is why they recommend two locations.



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  #5  
Old 8/1/17, 6:47 PM
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Default Re: Mold testing: 1 or 2 outdoor control samples?

This is also a good read.https://www.emlab.com/s/sampling/env...t-07-2008.html They recommend 2 outside and 2 in each room of concern.




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Old 8/1/17, 6:59 PM
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Default Re: Mold testing: 1 or 2 outdoor control samples?

Quote:
Originally Posted by frotte View Post
This is also a good read.https://www.emlab.com/s/sampling/env...t-07-2008.html They recommend 2 outside and 2 in each room of concern.
I think 3 samples at each location would be ideal (tie-breaker), but that would not be very cost effective for most clients. Keep in mind this article was written by the lab personnel (more lab fees). For preliminary mold screenings, I think one properly placed sample for each area of concern would be sufficient to show a problem.



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  #7  
Old 8/1/17, 7:07 PM
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Default Re: Mold testing: 1 or 2 outdoor control samples?

Thanks so much for your thoughtful replies Frank and Bradley. Much appreciated.
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Old 8/1/17, 7:15 PM
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Default Re: Mold testing: 1 or 2 outdoor control samples?

I responded to the other thread



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  #9  
Old 8/1/17, 7:27 PM
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Default Re: Mold testing: 1 or 2 outdoor control samples?

Quote:
Originally Posted by cevans View Post
I responded to the other thread
Doesn't count.




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  #10  
Old 11/27/18, 3:38 AM
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Default Re: Mold testing: 1 or 2 outdoor control samples?

I would definitely do two outdoor and one indoor. It makes a huge difference when the test results come back and the samples are being compared to each other.
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