Moisture Survey

A moisture survey (kosteuskartoitus) is a systematic investigation of a building's moisture conditions conducted by a qualified building diagnostics professional. The survey uses specialized instruments — pin-type moisture meters, capacitance scanners, relative humidity probes, and thermal imaging cameras — to measure moisture levels in walls, floors, ceilings, and other structural assemblies, and to identify any abnormal moisture accumulation.

A moisture survey is typically triggered by visible signs of moisture damage (water stains, mold, peeling surfaces), persistent musty odors, health symptoms associated with poor indoor air, or as part of a pre-purchase building inspection. The survey systematically examines all areas of the building, with particular attention to wet rooms, below-grade spaces, window and door areas, roof structures, and any areas where water damage has been reported.

The surveyor documents moisture readings at multiple measurement points, creating a moisture map that distinguishes between normal and elevated levels. Thermal imaging (infrared photography) can reveal temperature anomalies in wall surfaces that indicate hidden moisture, air leaks, or insulation defects. The technique is particularly effective in cold weather when temperature differences between wet and dry areas are most pronounced.

The survey report includes measurement data, photographs, identified problem areas, likely moisture sources, and recommendations for remediation. A thorough moisture survey provides the essential information needed to plan effective repairs and prevent recurrence. If moisture damage is confirmed, the next steps typically include identifying and eliminating the moisture source, defining the scope of damaged materials for removal, drying the structure, and planning the restoration work.