Calcium Chloride Concrete Moisture Test Kit – Humboldt HU2993A-00

Measure Moisture Vapor Emission from Concrete Before Flooring or Coating Installation

Calcium Chloride Moisture Testing for Concrete Slabs

The Humboldt Vapor Emission Test Kit provides a practical method for determining the moisture vapor emission rate (MVER) of concrete subfloors. The test helps evaluate whether a concrete slab is suitable for the installation of floor coverings or coatings by quantifying the amount of water vapor emitted from the slab over a defined period.

The method uses anhydrous calcium chloride, which absorbs moisture vapor released by the concrete. By measuring the weight gained by the calcium chloride during the test period, the moisture vapor emission rate can be calculated and expressed for the concrete floor area.

Designed for ASTM F1869 Testing

The Humboldt kit supports ASTM F1869, the standard test method for measuring moisture vapor emission from concrete subfloors using anhydrous calcium chloride. This type of testing is commonly performed before installing moisture-sensitive flooring systems and coatings.

Simple On-Site Test Procedure

Each test uses a calcium chloride container placed on the prepared concrete surface beneath a specially designed sealed dome. After the prescribed exposure period, the calcium chloride is weighed again. The change in weight, together with the exposure time and test area, is used to determine the moisture vapor emission rate.

Available Kit Configurations

• HC-2993A: 3-pack vapor emission test kit for approximately 1,000 sq. ft.
• HC-2993B: 12-pack vapor emission test kit for approximately 10,000 sq. ft.
• Includes calcium chloride containers, specially designed dome covers with seals, and test instructions.
• A balance or scale readable to 0.1 g is required and is sold separately.

Standards

• ASTM F1869 – Measuring moisture vapor emission rate of concrete subfloors using anhydrous calcium chloride
• ASTM E1907

Specifications

Frequently Asked Questions

What does a calcium chloride moisture test measure?

It measures the moisture vapor emission rate from a concrete slab rather than simply indicating the moisture present at the surface. The result helps assess moisture conditions before installing flooring or coatings.

Does the kit include the balance needed for the test?

No. Humboldt specifies that a balance or scale readable to 0.1 g is required and must be purchased separately.

What is the difference between HC-2993A and HC-2993B?

HC-2993A contains three vapor emission tests and is intended for approximately 1,000 sq. ft., while HC-2993B contains twelve tests and is intended for approximately 10,000 sq. ft.

Does the concrete surface need to be prepared before testing?

Yes. Proper preparation of the concrete test area is part of the ASTM F1869 procedure. Humboldt notes that concrete surface cleaning or light grinding equipment may also be required and is not included with the basic test kit.

Is this the same as testing relative humidity inside a concrete slab?

No. This kit measures moisture vapor emission from the concrete surface using the anhydrous calcium chloride method. In-situ relative humidity testing is a different test method.