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Trowel on Vapors Retarders and Rh
02-07-2011, 07:45 PM,
#1
Trowel on Vapors Retarders and Rh
I recently tested a slab that was below grade and then after the Bostik MVP4 app. The rh went up about 6 percent afterwards. From everything I read that should not happen, should it? They were runnign high 40's and one a low 50rh.

Then I threw down three CaCl tests, one on top of the MVP4, one on top of six mil plastic thats covering most of the the slab and one cacl test surrounded by the plastic. The cacl tests ran 1.4, 0.5 and 1.5 respectively. The one on top of the plastic being the lowest.

Several days after I put down the 6 mil plastic the rh is still running the same, 55 rh only on the MVP4, 65 rh on the MVP4 surrounded by plastic, and the last one totally covered by plastic ran 50 rh which was next to the lowest cacl test on top of the plastic.

This part of a multi level house built up against the side of a mountain has water trickling out of the granite underneath the house at the lowest level down by the pool.

In your opinion would it be safe to install soild hardwood on that slab over the plastic and MVP4 on a floating plywood subfloor?
Stephen Perrera dba
Top Floor Installation Co.
http://www.tucsonazflooring.com
http://www.floorsavior.com
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Trowel on Vapors Retarders and Rh - Ernesto - 02-07-2011, 07:45 PM