Water damage is a structure problem. Framing, subfloor, hardwood, plaster and concrete block absorb water and hold it long after carpet feels dry, and moisture sealed into a wall feeds odor, swelling and growth later. Structural drying is the part of the job that removes it, measured with meters rather than judged by touch.
How drying is planned
- Class 1 to 4 sets how much evaporation the room needs and how much equipment goes in
- Air movers aimed along walls and under cabinets to move moist air off wet surfaces
- LGR dehumidifiers for most rooms, desiccants for dense materials and cool basements
- Floor mat systems that pull water out of hardwood before it cups
Reading the goal
The tech who does the walkthrough takes a dry reference reading from an unaffected part of the same material, then logs wet readings every day. Equipment moves to what is still wet and comes out when materials read within 2 to 4 points of that reference. Psychrometric readings of temperature and humidity show the dehumidifiers are pulling water out of the air.
Seasons and houses here
Muggy summers make open windows a bad idea during a dry-out, and cold winters slow evaporation in basements and crawl spaces, so the drying team closes the house and controls the air instead. The EPA indoor air quality pages cover why indoor humidity matters, and the USDA Forest Products Laboratory publishes research on how wood takes up and gives off moisture.
For a rough number on your own materials, try the drying time estimator.