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Old 11-21-2017, 06:16 PM   #1
drwcal
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mver rate

Do any of you test or have you had to test for moisture in the slabs you are installing on. I have 1k of 2x4 porcelain going down near the ocean here in so.cal and I don't want any surprises down the road. If you have which test do you do, a RH or Calcium Chloride?

Have a Happy Thanksgiving All

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Old 11-21-2017, 06:26 PM   #2
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Not often. The last one was a damp church basement with many thousands of feet of tile. I use the old fashioned Calcium Chloride. Relatively cheap, but kinna slow.

The relative humidity is fast, but pretty spending for the equipment.

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Old 11-22-2017, 04:46 AM   #3
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Look around you. There are many companies who do nothing but slab moisture testing. Saves you from both equipment cost (meters and slab probes) and liability. You get a nice report with recommendations if problems show up
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Old 11-22-2017, 09:15 AM   #4
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Dirk, read up on the setting/vapor management materials you plan to use. They typically specify one method or the other, rarely both.

From all the continuing education I've been to, RH is a more accurate test as to slab conditions and that their is no direct correlation (or conversion) as to MVER and RH.

That said, from my experiences MFR's prefer you adhere to their method regarding the installation of their material.
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Old 11-23-2017, 01:21 PM   #5
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I just got done using Laticrete NXT Vapor Reduction Coating on a full condo plank tile install project in Tampa that had some moisture problems with the slab.

this stuff is great !

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Old 11-24-2017, 10:46 AM   #6
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Berkshire Hickory?
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Old 11-25-2017, 06:40 AM   #7
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I use both the calcium chloride test and the RH for comparison. We see alot of moisture issues here in florida on slabs. Many failures. You can buy the Calcium Chloride kits from www.vaportest.com and the RH kits from Wagner.
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Old 11-25-2017, 08:02 AM   #8
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Quote:
Originally Posted by mullet View Post
Berkshire Hickory?
yes
I think this is my 15th job with that color.
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Old 11-25-2017, 08:32 AM   #9
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The next time I tile I will use that color. just looks amazing.
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Old 11-25-2017, 09:18 AM   #10
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just to point out that laticrete nxt is an epoxy and like other epoxies requires a csp of 3-5 which means grinding or shotblasing of the surface.
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Old 11-25-2017, 10:50 AM   #11
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What issues are you going to have with vapor and ceramic tile? You are not installation soft goods. Seems like an additional profit stream for Laticrete.
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Old 11-25-2017, 11:29 AM   #12
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I am still waiting to see my first moisture induced ceramic tile failure on a job that was properly installed.
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Old 11-26-2017, 08:02 AM   #13
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If there is enough vapor pressure it can create enough force to delaminate the tiles from the substrate.

In the world of epoxy you do see this every now and then but at the same time epoxy totally seals the surface with no place for vapor migration at all.
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Old 11-26-2017, 09:20 AM   #14
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Seems that would be the reason the acceptable MVE rates are different for different floor coverings, Wapa.
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Old 11-26-2017, 10:01 AM   #15
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Show me the data wapa. I have served as an expert on this issue in court more than a few times and have never seen it. Vapor is a gas.
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