ASTM D , Standard Test. Method for Indicating Moisture in. Concrete by the Plastic Sheet. Method. General Guidance. ASTM E , F ACI R ASTM Dpdf – Download as PDF File .pdf) or read online. 1 Sep 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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Instead, always rely on in situ RH moisture testing. A positive result with observable moisture underneath the plastic sheet confirms that the concrete slab is too wet for a astm d4263 installation.

So unless you take the moisture gradient into account and measure moisture deeper astm d4263 the slab, expect to be misled by your test results. And more importantly, expect flooring failures. A negative test result a dry plastic sheet with no observable moisture underneath does not necessarily confirm that the slab is asttm dry. A concrete astm d4263 slab astm d4263 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. RH testing is a no brainer because it not only makes scientific sense, it makes economic sense too.


Observable moisture on the underside of the plastic awtm depends on the dew point, astm d4263 in turn depends on the surface temperature of the concrete.

The ASTM D Concrete Moisture Test A concrete floor slab with excess moisture pretty much guarantees astm d4263 flooring failure due to serious problems such as discoloration, bubbles, curling, adhesive deterioration, cupping, buckling, warping, mildew or mold. It sounds simple enough, right?

The ASTM D Concrete Moisture Test

Another plus is astm d4263 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 ashm floor.

Any moisture condensation or observable darkening of astm d4263 color of the concrete underneath the sheet suggests excessive moisture and means the slab is not ready for a moisture-sensitive floor covering. For more information about RH testing, click here. Ultimately, this creates an appreciably wetter condition at the surface than d423 the Plastic Sheet Test or any other surface test will be likely to show.

Afterward, the underside of the sheet is examined for astm d4263 of moisture.

For a astm d4263 minor investment in testing equipment, contractors and flooring installers can save asm time and money. Yes, it matters a great deal. It can no longer evaporate through the surface. Accurate Concrete Moisture Measurement? An unsealed concrete slab will typically exhibit an appreciable moisture gradient, drier at the surface and wetter astm d4263.


Its approach has been scientifically proven astm d4263 provide a true picture of the overall moisture condition of the slab. However, it is NOT recommended.

Nor does it indicate whether additional moisture is entering astm d4263 slab from below, such as in the absence of a vapor retarder. What happens next is that the moisture gradient will tend to disappear, bringing some moisture that was deeper down, up toward the astm d4263.

ASTM D4263

The test method involves taping an inch mm square of polyethylene film onto a concrete slab and waiting at least 16 hours. No more costly, moisture-related astm d4263.

No serious flooring failures due to hidden, excessive moisture in the slab. However, the reverse is not astm d4263.