This document specifies test methods for assessment of the moisture conditions of any kind of subfloor prior to the installation of levelling compounds and/or floor coverings or parquet floors bonded with adhesives. The methods are independent from subfloor chemical composition or materials and applicable with available equipment. For some highly reactive cement based compositions (e.g. ternary systems) the manufacturer might recommend a specific time when the subfloor is ready to be covered. This document describes the methods in detail and includes a protocol template for documenting the measured values.