ASTM D , Standard Test. Method for Indicating Moisture in. Concrete by the Plastic Sheet. Method. General Guidance. ASTM E , F ACI R ASTM D Standard Test Method for Indicating Moisture in Concrete by the Plastic Sheet Method. This standard is issued under the fixed designation D ; the 1 This test method is under the jurisdiction of ASTM Committee D33 on.
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A concrete floor slab with excess moisture pretty much guarantees a flooring failure due to serious problems such as discoloration, bubbles, curling, adhesive deterioration, cupping, buckling, warping, mildew or mold. Some methods of concrete moisture testing use a simple, qualitative approach.
However, it is NOT recommended. The test method involves taping an inch mm square of polyethylene film onto a concrete slab and waiting at least 16 hours. Afterward, the underside of the sheet is examined for signs of moisture.
Any moisture condensation or observable darkening of the color of the concrete underneath the sheet suggests excessive moisture and means 4d263 slab is not ready for a moisture-sensitive floor covering.
It sounds simple enough, right? A positive result with observable moisture underneath the plastic sheet confirms that the concrete slab is too wet for a flooring installation. However, the reverse is not true.
A negative test result a dry plastic sheet with no observable moisture underneath does not necessarily confirm that the slab is sufficiently dry. Observable moisture on the underside of the plastic sheet depends on the dew point, which in turn depends on the surface temperature of the concrete.
Nor does it indicate whether additional moisture is entering the slab from below, such as in the absence of a vapor retarder. An unsealed concrete slab will typically exhibit an appreciable moisture gradient, drier at the surface and wetter below.
The ASTM D Concrete Moisture Test
It can no longer evaporate through the surface. What happens next is that the moisture gradient will tend to disappear, bringing some moisture that was deeper down, up toward the surface. Ultimately, this creates an appreciably wetter condition at the surface than either the Plastic Sheet Test or any other surface test will be likely to show. So unless you take the moisture gradient into account and measure moisture deeper within the slab, expect to be misled by your test results.
Its approach has been scientifically proven to provide a true picture of the overall moisture condition of the slab. Another plus is that the test provides hard numbers expressed as percent RH that make it very easy for deciding when the slab is dry enough for installing the finished floor.
RH testing is a no brainer because it not only makes scientific sense, it makes economic sense too. For a relatively minor investment in testing equipment, contractors aztm flooring installers can save considerable time and money.
No more costly, moisture-related callbacks. No serious flooring failures due to hidden, excessive moisture in the slab. Instead, always rely on in situ RH moisture testing. For more information about RH testing, click here.
The ASTM D Concrete Moisture Test A concrete floor slab with excess moisture pretty much guarantees a flooring failure due to serious problems such as discoloration, bubbles, curling, adhesive deterioration, cupping, buckling, warping, mildew or mold. Accurate Concrete Moisture D463 Yes, it matters a great deal. And more importantly, expect flooring failures.