From the Forum: 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 ...
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