Mold testing: 1 or 2 outdoor control samples?

(Steve Nadeau) #1

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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(Steve Nadeau) #2

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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(Frank Rotte, , CPI, San Diego Home Inspector) #3

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

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(Bradley K. Toye, CMI) #4

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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(Frank Rotte, , CPI, San Diego Home Inspector) #5

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

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(Bradley K. Toye, CMI) #6

[quote="frotte, post:5, topic:117784"]

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

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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(Steve Nadeau) #7

Thanks so much for your thoughtful replies Frank and Bradley. Much appreciated.

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(Chuck Evans, CMI TREC 7657) #8

I responded to the other thread

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(Frank Rotte, , CPI, San Diego Home Inspector) #9

[quote="cevans, post:8, topic:117784"]

I responded to the other thread
[/QUOTE]

Doesn't count. :)

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(Mitchel Brooks) #10

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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