Coatings and remediator instruction at IICRC?

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Group:

I'm currently working on a project that involved a fairly modest water loss in the attic of a single family residence. The source was a kinked condensate line from the forced-air A/C unit located in the attic (space heat is via a combination of radiant floor and hot water fin-tube convectors).

A limited area of the blown-in cellulose insulation and adjoining framing was wet; fungal growth was visible on the trusses. The amount of water released was not enough to flow through the poly vapor retarder and did not significantly damage the underlying gyp-board ceiling.

The remediation contractor removed all of the insulation from the entire ~1200 sq ft attic, used ice blasting to remove fungal materials from the affected framing elements, then initially used Anabec cleaning, disinfecting and protective products. To shorten a longer story, he subsequently returned to the home, used a Zinsser disinfectant and then sprayed clear PermaGuard on every square inch of the framing, poly vapor retarder, and OSB roof decking (plus the DWV piping, fireplace flue, etc.). BTW, PermaGuard contains small quantities of chlorothalonil (an EPA-registered pesticide), but the coating itself is not EPA registered.

When I asked why he coated every square inch of every surface in the attic (even those that had not been water damaged) the remediator responded that he was instructed to do so during training at the IICRC. He named the specific instructors, and they are familiar persons within the IICRC. Their names are not of critical importance in this inquiry.

Here are my questions -- I'd appreciate your feedback.

1. Has anyone else been instructed to use a coating in this way by the IICRC or by others? If so, what thought process was used or justification provided?

2. Does anyone have any experience in using this coating over the Anabec " Anashield " ? Could there be a chemical compatibility concern? Could the " organosilane " (Anashield) inhibit or slow curing of the PermaGuard (a " latex acrylic resin interior sealer " )?

Replies either on this list or privately (wab -at- michaelsengineering.com) are welcome.

TIA.

Wane

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Wane A. Baker, P.E., CIH

Division Manager, Indoor Air Quality

MICHAELS ENGINEERING

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