1 Aug ASTM D(). Standard Test Method for Indicating Moisture in Concrete by the Plastic Sheet Method. standard by ASTM International. ASTM D Standard Test Method for Indicating Moisture in Concrete by the Plastic Sheet Method. ASTM Dpdf – Download as PDF File .pdf) or read online.

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The ASTM D Concrete Moisture Test

Instead, always rely on in situ RH moisture testing. And more importantly, expect flooring failures. 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.

A negative test result a dry plastic sheet with no observable moisture underneath does not necessarily confirm that the slab is sufficiently dry. 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.

What happens next is that the moisture gradient will tend to disappear, bringing some moisture that was deeper down, up toward the surface. For a relatively minor investment in testing equipment, asmt and flooring installers can save considerable time and money. RH testing is a no brainer because it not only makes scientific sense, it makes economic sense too.

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Yes, it matters a great deal. 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. Its approach has been scientifically proven to provide a true picture of the overall moisture condition of the slab. Some methods of concrete moisture testing use a simple, qualitative approach.

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. A positive result with observable moisture underneath the plastic sheet confirms that the concrete slab is too wet for a asrm installation.

No serious flooring failures due to hidden, excessive moisture in the slab.

Nor does it indicate whether additional moisture is entering the slab from below, such as in the absence of a vapor retarder. Accurate Concrete Moisture Measurement? Afterward, the underside of the sheet is examined for signs of moisture. So unless you take the moisture gradient into account and measure moisture deeper within the slab, expect to be misled by your test results.

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Any moisture condensation or observable darkening of the color of the concrete underneath the sheet suggests asfm moisture and means the slab is not ready for a moisture-sensitive floor covering.

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. However, it is NOT recommended. The test method involves taping an inch mm square of polyethylene film onto a concrete slab and waiting at astj 16 hours.

ASTM D4263

However, the reverse is not true. It can no longer evaporate through the surface.

No more costly, moisture-related callbacks. An unsealed concrete slab will typically exhibit an appreciable moisture gradient, drier at the surface and wetter below.

It sounds simple enough, right? For more information about RH testing, click here.