How long does structural drying take?
The time depends on the materials, how much water got in, the air in the building and how far the readings were from dry at the start. The job ends when the readings reach the dry standard, so the length of the job is set by the building rather than by a fixed schedule.
A room with a finished surface and a small wet area can reach the dry standard quickly. A cellar with a wet subfloor, a wet lower wall and a wet cavity takes longer, because the water has further to travel out of the material and into the air. Dense plaster and framing also hold moisture for longer than drywall does.
Older walls often have more than one layer of material, and each layer has to be read. The crew does not guess at the end of the job. It keeps taking readings until the framing and subfloor are at the dry standard, and it tells you the date it expects that to happen after each visit.
Why does a dry surface still hide wet framing?
Surface moisture leaves a room faster than moisture held inside a material. A painted wall can feel dry while the framing behind it still holds water, and a floor can look fine while the subfloor beneath it is wet. Moisture meters measure the material itself, which is why the crew relies on them rather than on touch.
Wood and plaster hold water in their structure, and that water moves slowly toward the surface. Evaporation at the surface can stop once the surface is dry, while the wet core is still wet. A surface that feels dry to the hand is only a surface, and the meter reading tells the crew what is underneath.
This is why the drying log records readings in the wall and the floor, not only on the finish. A crew that stops at the surface can leave a cavity that starts to smell or to show stains weeks later, when the damage is harder to trace back to the event that caused it.
What makes the drying job cost more or less?
The size of the wet area, the number of materials affected, the depth of the water, the age and construction of the walls and the number of rooms affected all shape the work. The price for the drying stage is explained and approved before the equipment is set, and no figure is given here.
A single room with wet carpet and a sound wall is a different job from a cellar with wet framing on three walls and a wet subfloor under a finished room. The crew counts the rooms, the materials and the readings it needs to take, and it sizes the equipment to match. More equipment and more days of drying change the scope in predictable ways.
Older plaster walls and the cavities behind them often take more work to open and read than modern drywall. Access also matters: a wall that is behind built-in cabinets, or a floor under a heavy shop bench, adds time. Each of these factors is named at the first visit, and the scope is written out before the job starts.
Can I run fans and a dehumidifier myself?
You can run household fans and a small dehumidifier to help air move after a small spill that is already dry on the surface. For a wet subfloor, a wet wall or a cavity, household equipment usually does not reach the materials, and the job takes much longer than it should.
A household box fan moves air across a surface, but it does not move enough air to drive moisture out of a wall or a floor. A small dehumidifier can keep a damp room from getting worse, but its capacity is limited and it may not run long enough to remove the water from deep materials. Running the wrong equipment can also leave a room wet for a long time.
If you are unsure, take photographs and call the crew. A technician can tell you in a few minutes whether the job needs professional equipment or whether a fan and a dry day will do. Moisture readings from a crew also help the insurer see what was done.
What do I need to keep for the drying record?
Keep the crew's moisture readings, the drying log, the equipment list, the dates of each visit and the final dry-standard readings. Photographs taken during the job show the progress of the work. These records explain the drying stage to an insurer and to anyone who later works on the building.
The log lists the points where readings were taken, the values at each visit and the target dry level. It shows whether the materials moved toward dry over time, which is the clearest evidence that the drying worked. A log that stops at the first reading is a sign to ask for the rest.
Keep the records with the rest of your claim papers. The insurer may request them, and a contractor who repairs the house later will want to see that the framing and subfloor were dry before the finish went back on. Your insurer and your policy decide what is covered.