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Substrate Odor
05-19-2012, 06:06 AM, (This post was last modified: 05-19-2012, 06:10 AM by CCR.)
#1
Substrate Odor
I was called upon to perform RH tests at an office last month. A full blown ASTM compliant test for size of space was not approved due to cost, so we agreed on placing 6 sensors in random locations including 1 location where a strong midew odor was present under the rubber backed carpet tile, bonded with an unknown brand of pressure sensitive adhesive.

The carpet was extremely well bonded in all test areas, and it even took 2 of us to pull up a couple of carpet tiles . There was also obvious old Dependable patch material under the mildew area and another location which I believe are causing the odor problem. Readings were 70% - 82%, with the highest at the mildew location.

The customer indicates that the carpet is cleaned every 6 weeks or so, and the water is all but fully extracted when complete.

I recommended that the effected areas (with gypsum) plus a 5-6' perimeter be shot blasted to remove all adhesive, remove all gypsum patch. skim as needed with Ardex FF and re-install the tiles. To me, this was a conservative approach compared to installing a moisture mitigation system when it may not be needed. Remember, bonding is not the issue - it's the smell in 2 areas.

I was called back this week to conduct follow up readings and found nothing had been done but replace the tiles with more adhesive. The worst mildew spot was not carpetd and still open. In that location, the RH jumped from 82% to 96%!!! Two other locations spiked 10% and 7%, yet have no odor issues.

The building engineers told me the French drain system below the worst area is so dry it has cob webs. So this makes me still go back to the gyp patch scenario. I should point out the concrete is about a CSP-3, and is about 15 years old. I should also point out that when carpet is replaced, they just slap down more pressure sensitive. Wonder if the build up is blocking moisture(?)

I would welcome any input.

Thanks!!!!!
JK Nixon
Concrete Restoration Services, LLC
Pittsburgh, PA
http://www.rhtester.com
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Messages In This Thread
Substrate Odor - CCR - 05-19-2012, 06:06 AM
RE: Substrate Odor - CC Solutions - 05-20-2012, 09:15 AM
RE: Substrate Odor - CCR - 05-20-2012, 02:07 PM
RE: Substrate Odor - CC Solutions - 05-20-2012, 10:18 PM
RE: Substrate Odor - CCR - 05-21-2012, 03:34 AM
RE: Substrate Odor - CC Solutions - 05-21-2012, 06:45 AM
RE: Substrate Odor - Matt S - 05-22-2012, 06:19 PM
RE: Substrate Odor - CC Solutions - 05-22-2012, 07:07 PM
RE: Substrate Odor - Matt S - 05-22-2012, 07:16 PM
RE: Substrate Odor - CCR - 05-23-2012, 06:02 AM
RE: Substrate Odor - CC Solutions - 05-23-2012, 06:16 AM
RE: Substrate Odor - Matt S - 05-23-2012, 06:58 AM
RE: Substrate Odor - CC Solutions - 05-23-2012, 07:38 AM
RE: Substrate Odor - CCR - 05-23-2012, 07:46 AM
RE: Substrate Odor - Matt S - 05-23-2012, 09:51 AM
RE: Substrate Odor - eaadams - 05-24-2012, 12:58 PM
RE: Substrate Odor - CCR - 05-24-2012, 04:45 PM
RE: Substrate Odor - CC Solutions - 05-27-2012, 09:54 PM
RE: Substrate Odor - CCR - 06-15-2012, 11:02 AM
RE: Substrate Odor - CCR - 07-15-2012, 06:15 AM
RE: Substrate Odor - eaadams - 07-18-2012, 11:09 AM
RE: Substrate Odor - CCR - 07-18-2012, 11:36 AM