### What is an Acceptable Moisture Reading in a Hardwood Floor? Moisture mapping is a crucial process for determining the suitability of a subfloor for hardwood flooring installation. It involves measuring the moisture content of the subfloor to ensure it aligns with acceptable levels, preventing potential issues and ensuring the longevity of the hardwood flooring. When assessing the acceptability of moisture readings in hardwood floors, certain parameters must be considered, such as the moisture content of the wood itself and the environmental conditions on the subfloor. ### Acceptable Moisture Content for Hardwood Flooring The recommended optimal moisture content for hardwood flooring generally ranges between 6% and 9%. This level prevents excessive expansion or contraction of the wood due to moisture changes, minimizing the risk of buckling, cupping, or other damage. ### Acceptable Moisture Reading for Subfloors The acceptable moisture reading for a subfloor before installing hardwood flooring varies slightly depending on the type of subfloor. Typically, these readings should fall within the following ranges: - Concrete subfloors: 3.5% - 4.5% - Cement board subfloors: 3.0% - 4.0% - Plywood subfloors: 5.0% - 8.0% By adhering to these guidelines, homeowners and contractors can ensure the optimal moisture levels of the hardwood flooring and subfloor, contributing to the overall durability and aesthetics of the finished installation.