Detecting Efflorescence in Stone Floors Using a Moisture Meter and Filter Paper

Frederick M Hueston  StoneForensics.com

Efflorescence, a common issue in stone flooring, occurs when soluble salts migrate to the surface of the stone, leaving unsightly deposits. To identify and address this problem, you can conduct a simple yet effective test using a moisture meter, filter paper, and distilled water. The following is the step-by-step process of testing your stone floor for the presence of salts, specifically efflorescence.

Materials You’ll Need:

Filter paper

Clean plastic surface

Distilled water

Pin-type moisture meter

Step 1: Preparing the Filter Paper

Begin by placing a piece of filter paper on a clean plastic surface. This filter paper will be instrumental in detecting efflorescence on your stone floor. It is essential to start with a clean and dry environment to obtain accurate results.

Step 2: Initial Moisture Reading

Now, carefully place a drop of distilled water onto the filter paper. Ensure that the water is evenly distributed across the paper’s surface. It’s crucial to use a pin-type moisture meter for this test. Using the meter, take a moisture reading of the filter paper. This initial reading serves as your baseline measurement.

Step 3: Preparing for Stone Surface Testing

Next, take a fresh piece of filter paper. This filter paper will be used to test the stone floor itself. Place it directly onto the stone surface you wish to examine. Again, add a drop of distilled water to the filter paper and wait for approximately one minute. This brief waiting period allows the moisture from the stone to interact with the filter paper.

Step 4: Measuring the Stone Surface

After waiting for one minute, use your pin-type moisture meter to take a moisture reading from the filter paper placed on the stone surface. This reading will provide valuable information about the stone’s moisture content and any potential salt presence.

Step 5: Analyzing the Results

To identify efflorescence on your stone floor, compare the moisture readings you obtained from the two filter papers. If the reading from the filter paper on the stone surface is significantly higher than the baseline reading from the first filter paper, it suggests the presence of salts. This elevated moisture level is indicative of efflorescence, confirming the issue with your stone floor.

Efflorescence can mar the appearance of your stone flooring and may be a sign of underlying moisture-related problems. Once you’ve confirmed its presence, it’s important to address the root cause to prevent further damage and maintain the beauty of your stone floor.

By following this straightforward method involving a moisture meter, filter paper, and distilled water, you can efficiently detect efflorescence on your stone floor and take the necessary steps to rectify the issue, ensuring your flooring remains both functional and visually appealing.