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Concrete Moisture Barriers for Protection Against Hydro-Static Pressure & Green Concrete

  • Date Submitted: 10/09/2013 11:27 PM
  • Flesch-Kincaid Score: 58.6 
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In my experience, more often than not, floors warp, bubble and "let go" due to the presence of moisture in the concrete from hydro-staic pressure or green concrete. Alot of people consider concrete to be dry as soon as it can be walked on, but this is not the case. A moisture barrier must be used to solve these problems.
Throughout my career as a flooring contractor, I have come across countless numbers of timber and vinyl floors that have failed due to one reason or another. After thorough investigations more than 80% of these floors have failed due to either wet concrete or hydro-static pressure. To my amazement most of these floors had never been moisture tested, (a very quick and easy test). Time and time again I hear builders saying "she'll be right mate the concrete's been down for weeks".
To conform to the Australian standard of flooring installations, concrete must have a reading of no greater than 5.5% moisture content. As a general rule of thumb, concrete dries at approximately 20-25mm per month.
If you take these figures into account, then a average slab of 100mm thick can take 4-5 months of drying time before it will conform to Australian standards. If Hollow Concrete Slab Forming Machine limestone cement Rotary Dryer manufacturer,

in this drying process, the concrete is exposed to rain or any water again, this will further increase the drying time. Concrete is like a sponge and will continue to absorb water if present. These times can vary due to surrounding conditions etc. It is generally a myth that concrete dries faster in hotter climates. In hotter climates you normally find that relative humidity is alot higher JZM750 Concrete Mixer,
meaning there is much more moisture in the air, which will slow the drying times even further.
The other concern for installers is hydro-static pressure. Hydro-static pressure comes from underneath the concrete and moves it's way through the capillary voids in the matrix of the concrete. Once a floor has...


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