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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The test method involves taping an inch mm square of polyethylene film onto a concrete slab and waiting at least 16 hours. Afterward, astm d4263 underside of the sheet is examined for signs of moisture.
Any moisture condensation or observable darkening of the color of the concrete underneath the sheet suggests excessive moisture and means the astm d4263 is not ready for a moisture-sensitive floor covering. It can no longer evaporate astm d4263 the surface. However, the reverse is not true.
A negative test result a dry plastic sheet with no observable moisture underneath does not necessarily confirm that the slab is sufficiently astm d4263. RH testing is a no brainer astm d4263 it not only makes scientific sense, it makes economic sense too.
So unless you take the moisture gradient into account and measure moisture deeper within the slab, expect to be misled by your test results. An unsealed concrete slab astm d4263 typically exhibit an appreciable moisture gradient, drier at the surface and wetter below.
Yes, it matters a great deal. Ultimately, this creates aastm appreciably wetter condition at astm d4263 surface than either the Plastic Sheet Test or any other surface test will be likely to show. 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 astm d4263 mold.
The ASTM D Concrete Moisture Test
astm d4263 Nor does it indicate whether additional moisture is entering the slab from below, d4236 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 astm d4263 the slab is dry enough for installing the finished floor.
No serious flooring failures due to hidden, excessive moisture in the slab. Some methods of concrete moisture testing use a simple, astm d4263 approach. It sounds simple enough, right?
Observable moisture on the underside of astm d4263 plastic sheet depends on the dew point, which in turn depends on the surface temperature of the concrete. For a relatively astm d4263 investment in testing equipment, contractors and f4263 installers can save considerable time and money. Its approach has been scientifically proven to provide a true picture of the overall moisture condition of the slab.
However, it is NOT recommended. Wstm positive result with observable moisture underneath the astm d4263 sheet confirms that the concrete slab is too wet for a flooring installation.
No more costly, moisture-related callbacks. Accurate Concrete Moisture Measurement? A concrete floor slab with excess moisture pretty astm d4263 guarantees a flooring failure due to serious problems such as discoloration, bubbles, curling, adhesive deterioration, cupping, buckling, warping, mildew or mold.
And more importantly, expect flooring failures. For more information about RH testing, click r4263. What happens next is that the moisture gradient will tend to disappear, bringing some astm d4263 that was deeper down, up toward the astm d4263. Instead, always rely on in situ RH moisture testing.