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

Afterward, the underside of the sheet is examined for signs of moisture. It can no longer evaporate through the surface. 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.

For more information about RH testing, click here. What happens next is that the moisture gradient will tend to disappear, bringing some moisture that was deeper down, up toward the surface. So unless you take the moisture gradient into account and measure moisture deeper within the slab, expect ast, be misled by your test results.

A negative test result a dry plastic sheet with no observable moisture underneath does not necessarily confirm that the slab is sufficiently dry. RH testing is a no brainer because it not only makes scientific sense, adtm makes economic sense too.

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

Yes, it matters a great deal. However, it is NOT recommended.

And more importantly, expect flooring failures. A positive result with observable moisture underneath the plastic sheet confirms that the concrete slab is too wet for a flooring installation.

Accurate Concrete Moisture Measurement? Some methods of concrete moisture testing use a simple, qualitative approach.

ASTM D4263

It sounds simple enough, right? Any moisture condensation s4263 observable darkening of the color of the concrete underneath the sheet suggests excessive moisture and means the slab is not ready for a moisture-sensitive floor covering.

No more costly, moisture-related callbacks. Instead, always rely on in situ RH moisture testing. However, the reverse is not true.

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Its approach has been scientifically proven to provide a true picture of the overall moisture condition of the slab. An unsealed concrete slab will typically exhibit an appreciable moisture gradient, drier at the surface and wetter below.

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. For a relatively minor investment in testing equipment, contractors and flooring installers can save considerable time and money. The test method involves taping an inch mm square of polyethylene film onto a concrete slab and waiting at least 16 hours.

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.