Damp ratings are a way to quantify the level of moisture in a building. These ratings are often used by damp proofing professionals to assess the severity of a damp problem and to recommend appropriate treatments. The ratings are usually based on moisture content readings taken from various parts of the building, such as walls and floors. A high damp rating indicates a severe problem that requires immediate attention, while a low rating may suggest that preventive measures are sufficient. Understanding these ratings can help homeowners make informed decisions about damp proofing their properties.