Structural Drying vs. Surface Drying
Executive Summary
Surface drying only removes moisture you can feel, while structural drying forces deeply embedded moisture out of materials like wood framing and concrete. Without structural drying, latent moisture leads to dry rot, structural failure, and hidden mold.
First actions
- Stop the moisture source when safe.
- Record affected materials and visible water.
- Use measurements rather than touch alone to assess drying.
Stop and escalate
- Do not open building assemblies where electrical or structural hazards may exist.
- Use qualified assessment for hidden moisture or suspected contamination.
The Illusion of Dryness
When water spills, it quickly wicks into porous materials via capillary action. A standard fan might dry the face of the drywall or the top of the flooring, making it feel dry to the touch. However, the internal cavity, subfloor, and framing studs can remain saturated.
The Science of Structural Drying
Professional structural drying manipulates three elements: temperature, humidity, and airflow. High-velocity air movers strip away the boundary layer of moisture on surfaces, while commercial low-grain refrigerant (LGR) dehumidifiers pull that moisture out of the air.
- Psychrometry: The study of the thermodynamic properties of moist air.
- Vapor Pressure: Creating a lower vapor pressure in the air than in the wet material to force evaporation.
Key definitions
- Structural drying
- Drying efforts directed at moisture within building materials, not only their surface.
Authoritative Sources
Professional Services
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