What is MVE? |
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| Written by Jason Griffiths |
| Friday, 04 September 2009 11:53 |
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MVE stands for moisture vapor emissions. We refer to this when applying a coating over a concrete slab on grade. When there is moisture beneath the slab it can travel up through the slab as vapor. Usually the hottest time of the day is when you have the highest levels of MVE. For example you will see some slow drying coatings bubble as they dry when applied in the heat of the day and not bubble when applied at cooler times. We rate our coatings adhesion based on MVE, for a non breathable epoxy type system. Basically the better it adheres, the higher the MVE it can withstand before blowing off or blistering. We base our recommendations off of calcium chloride tests, which measure the MVE coming off a slab, this test takes about 2-3 days to perform. We can then recommend a coating that will work based on the final result of the test. The bottom line is that pretty much all of our systems will withstand 5-8 lbs of mve and then we have others that will go to 18lbs. Stay away from anything in the high teens as they are probably not worth the risk. We have our system 1 down on 3 jobs with readings of 25 lbs as a test (over a year old) and so far they are holding. System one uses all waterbased technology which is considered breathable and that is why we have been testing it with these extreme levels of MVE.. |
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