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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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 d4236 surface temperature of the concrete.
Any moisture condensation or v4263 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.
What happens next is that the moisture gradient will tend to disappear, bringing some moisture that was deeper down, up toward f4263 surface. No more costly, moisture-related callbacks.
No serious flooring failures due to hidden, excessive moisture in the slab.
Accurate Concrete Moisture D463 Afterward, the underside of the sheet is examined for signs of moisture. For more information about RH testing, click here.
The ASTM D Concrete Moisture Test
And more importantly, expect flooring failures. However, the reverse is not true. Instead, always rely on in situ RH moisture testing. It can no longer evaporate through the surface.
RH testing is a no brainer because it not only makes scientific sense, it d423 economic sense too. It sounds simple enough, right?
Yes, it matters a great deal. However, it is NOT recommended. Ultimately, this creates an appreciably wetter condition asgm the surface than either the Plastic Sheet Test or any other surface test will be likely to show.
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 a relatively minor investment in testing equipment, contractors and flooring installers can save considerable time and money.
Some methods of concrete moisture testing use a simple, qualitative approach.
The ASTM D Concrete Moisture Test D463 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 flooring installation.
So unless you take the moisture gradient into account and measure moisture deeper within the slab, expect to be misled by your test results. Axtm 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. Nor does it indicate whether additional moisture is entering the slab from below, such as in the absence of a vapor retarder. 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.
The test method involves taping an inch mm square aastm polyethylene film onto a concrete slab and waiting at least 16 hours.