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Who Says Rapid Rh Reads High?
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08-07-2012, 07:29 PM #1
Ernesto Concrete Moisture Expert *****
Status: Offline Posts:606 Threads:33 Joined:Sep 2009
Tested a slab on grade, almost in the wash, probably one of the lowest points in the area as far as water tables run. Got readings of 67 to 70% rh @ 70 to 72 F. Getting tons of rain down here and water puddles in the yard. Home is 15 years old at least so doubt there is a vapor barrier underneath. I was certain I would get at least a 95% rh. Goes to show you never know. I be gluing some engineered hardwood down with Sika T-21.

Didja know Sika has no numbers for either 1869 or 2170?

Stephen Perrera dba
Top Floor Installation Co.

08-10-2012, 01:45 PM #2
CCR Concrete Moisture Coach ***
Status: Offline Posts:236 Threads:14 Joined:Dec 2011
I've seen a number of manufacturers of various products who don't state tolerance levels or requirements. Surprising to say the least.

JK Nixon
Concrete Restoration Services, LLC
Pittsburgh, PA

08-20-2012, 01:46 PM #3
eaadams Concrete Moisture Expert *****
Status: Offline Posts:600 Threads:88 Joined:Jul 2010
I had some test results just come back on a project.

Slab is 2.5 years old and I was convinced it would come in wet.

Every test came in from the 70s - 80s. Thoroughly surprised.

08-20-2012, 07:07 PM #4
CC Solutions Concrete Moisture Evangelist *******
Status: Offline Posts:1,067 Threads:69 Joined:Dec 2009
Well that's great!

JD Grafton
Concrete Answers for Flooring Problems

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