What is an Acceptable Moisture Reading in a Hardwood Floor?

For optimal performance and longevity of hardwood flooring, it is crucial to ensure that the subfloor is sufficiently dry. Determining the moisture content of the subfloor is essential before installing hardwood. Acceptable moisture readings can vary depending on the type of wood flooring used.

Moisture readings are typically measured using moisture meters. Generally, moisture content should not exceed 12% for solid hardwood flooring and 15% for engineered hardwood flooring. Readings above these levels indicate excess moisture, which can lead to flooring deformation, buckling, or other issues. It is recommended to consult with flooring professionals to determine the specific acceptable moisture reading for your particular hardwood flooring type.

Subfloor Moisture Testing Methods

• Calcium Carbide Test: A simple and inexpensive method that involves placing calcium carbide in a sealed jar on the subfloor. If moisture is present, a chemical reaction occurs, producing acetylene gas and calcium hydroxide.
• Moisture Meter Test: A handheld electronic device that measures the electrical resistance of the subfloor to determine its moisture content.
• Relative Humidity Test: Utilizes a hygrometer to measure the relative humidity of the air adjacent to the subfloor. Can be used to assess the overall moisture conditions in the environment.
• Psychrometer Test: A more accurate method that compares the temperature of wet and dry thermometers, providing an indication of the moisture content in the air.

Importance of Subfloor Moisture Testing

Conducting subfloor moisture testing prior to hardwood flooring installation is vital for the following reasons:

• Prevents flooring damage caused by excessive moisture.
• Ensures proper bonding of the flooring adhesive to the subfloor.
• Reduces the risk of wood warping and buckling.
• Improves the overall longevity and performance of the hardwood flooring.