ASTM F formally recognizes the use of in situ probes as a means of conducting relative humidity testing. In fact, ASTM F represents a fundamental. ASTM F ASTM F RH (Relative Humidity). Testing Protocol: ASTM Abstract: Significance and Use. Moisture permeating from concrete floor slabs. Standard Test Method for Determining Relative Humidity in Concrete Floor Using in situ Probes. Apparatus – Humidity Probe and Digital Meter Accuracy ± %.

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After properly r2170 the RH probes into the concrete slab, f2107 contractors and flooring professionals can expect to make decisions on how to move forward in just 24 hours. Each test hole must be drilled to the depth determined at Step 5 above section 10 of ASTM F and properly prepared.

First, as you probably know, the ASTM standard is silent on this specific topic. If not, call their technical team and ask the questions.

Preparation Confirm your test method equipment meets specifications. December 27, at 3: All sensors must be calibrated no less than 30 days prior to use.

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In this way, in situ measurement provides a composite picture of overall slab moisture levels, and provides the data necessary to make business decisions regarding flooring installations. No other concrete moisture test is as fast or as accurate as the in situ RH test. Logically then, moisture levels at the bottom of a slab will read higher from those at the surface.


The test hole depth is not a fixed depth, but it must be calculated based on slab thickness and number of drying sides: Many contractors use vapor barriers directly under the slab to slow moisture permeation. As far back as the s, laboratories at the Portland Cement Association conducted controlled tests that verified the accuracy of RH testing.

Updated ASTM F2170 Reflects the Newest Science about RH Testing

At this stage, the probes can be removed and the sleeves capped until further testing is required before mitigation can be carried out. That being said, I have heard a couple of different methods people are using. Until now, the ASTM F standard has required a hour waiting period between drilling the test holes astmm the RH probes are placed and taking official RH measurements.

Once you find out the methodology they require to meet warranty, I would reach out to someone within RCI in your area to conduct the tests. We have people who use the Rapid RH on shallow pours.

10 Guidelines for ASTM F Compliance

First, I have to state that F is specified for interior applications that are under consistent ambient air controls. In that case, builders did not allow the slab sufficient time for concrete moisture levels to equilibrate reach equilibrium moisture content according to relative humidity Sstm. We also will not be shipping on these days, but will resume shipping on Tuesday, January 2nd.

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Know the required depth of the test holes. Section 9 of the standard requires that aztm the slab and the ambient air above it must be at service conditions for a minimum of 48 hours before testing.

UPS peak season may cause delays. In practice, readings are f170 taken before the 72 hours has passed, so contractors have an idea of how things are trending.

Make sure your calibration is up to date. Does the finish roof product have specifications for testing the concrete deck?

Other methods typically involve taking measurements only at the surface of the slab. Learn how your comment data is processed. The new probes are designed to give a good indication of high relative humidity after an hour of testing. After the initial reading, readings can be updated at any time d2170 with two conditions in mind: If you forward to 1: The next five have to do with the proper installation f22170 use of the RH test method. The MVER is defined as the rate of water vapor emissions from the surface of concrete and is determined with the use of a desiccant material sealed to the slab surface for a specified time period, then measured.

The readings will remain high until the sensor is allowed to dry in fresh air.