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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For a relatively minor investment in testing equipment, contractors and flooring installers can save considerable time and money.

ASTM D4263

It sounds simple enough, right? No serious flooring failures due to hidden, excessive moisture in the slab. And more importantly, expect flooring failures. A positive result with observable moisture underneath the plastic sheet confirms that the astm d4263 slab is too wet for a flooring installation.

Afterward, the underside of the sheet is examined for signs of moisture. Yes, it matters a great deal. Astm d4263 moisture on the underside astm d4263 the plastic sheet depends on the dew point, which in turn depends on the surface temperature of the concrete. No more costly, moisture-related callbacks.

The ASTM D Concrete Moisture Test

Any moisture condensation or observable astm d4263 of the color of the concrete underneath the sheet suggests excessive moisture and means the slab asm not ready for a moisture-sensitive floor covering.


It can no longer evaporate through the surface.

However, the reverse is not true. Its astm d4263 has been scientifically proven to provide a true atsm of the overall moisture condition of the slab. However, it is NOT recommended.

Some methods of concrete moisture testing use a simple, qualitative approach. The test method involves taping an astm d4263 mm square of polyethylene film onto a concrete slab and waiting at least 16 hours. What happens next is that the moisture gradient will tend to disappear, bringing some moisture that was deeper down, up toward the surface.

A negative test result astm d4263 dry plastic sheet with no observable moisture underneath does not necessarily confirm that the slab is sufficiently dry. For more astm d4263 about RH testing, click here.

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. RH testing is a no brainer because it d423 only makes scientific sense, it makes astm d4263 sense astm d4263. So unless you take the moisture gradient into account and measure moisture deeper within the slab, expect to be misled by your test results. A concrete floor slab with d42663 moisture pretty much guarantees a astm d4263 failure due to serious problems such as discoloration, bubbles, curling, adhesive deterioration, cupping, buckling, warping, mildew or mold.


Nor does it indicate whether additional moisture is entering astm d4263 slab from below, such as in the absence of a vapor retarder.

Accurate Concrete Moisture Measurement? 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. Instead, always rely on in situ RH moisture testing.

An unsealed concrete slab will typically exhibit astm d4263 appreciable asm gradient, drier at the surface and wetter below. The ASTM D Concrete Moisture Astm d4263 A concrete floor slab with excess moisture pretty much guarantees a flooring failure due to serious problems such as d42663, bubbles, curling, adhesive deterioration, cupping, buckling, warping, mildew or mold.