How does structural drying actually remove the water?
Moisture leaves a wet material when the air around it is drier than the material. Air movers speed up the exchange at the surface, and dehumidifiers take the moisture out of the air so the exchange can continue. The readings show whether the material is still giving up water.
A wet wall does not dry because a fan is pointed at it. The water inside the material has to move to the surface and then into the air, and the air has to be able to take it. That is why the dehumidifier is as important as the fan, and why a closed room with wet air dries slowly.
The process is slow near the end. The surface dries first, and the water inside takes longer to reach it. A reading that is close to the target can take days to get there, which is normal, and the crew explains what each reading means.
How do you know a wall or a floor is dry?
A material is dry when its moisture reading reaches the dry target set for that material, and when the reading stays at that level on a later visit. Surface feel is not a measure. The crew uses a meter, and the readings are recorded.
Different materials have different dry targets. Wood framing and subfloor, drywall, plaster and masonry read differently on the same meter, so the target is set for each one. A wall that feels dry to the hand can still read wet inside.
The final check is made on a later visit, after the equipment has been turned off for a while. A material that rises again after the equipment stops is still wet, and the drying goes on.
Why does drying take longer on the Gulf coast?
The humid air holds moisture that the dehumidifier has to remove, so the drying runs more slowly than it would in drier air. The readings are taken more often, and the equipment is checked against the air in the building, not only against a fixed schedule.
A building that is humid inside, with the windows open or the doors left ajar, can pull moist air in and keep the wet materials from drying. Keeping the building closed while the equipment runs helps the dehumidifier do its job.
The humid air also means that a room that looks dry can hold moisture in its framing for longer than expected. A crew working here reads the framing as well as the surfaces, and it does not close a wall until the readings show the framing is dry.
What moves the price of structural drying?
The price follows the number of wet materials, the area that has to be dried, how many readings are taken, and the equipment needed for the building and the air. No figure is given on this site. The scope is explained and approved on site before any equipment is set.
The area and the depth of the wet material are the main drivers. A wet floor with dry walls is a smaller job than a floor and a wall cavity that both need drying, and each opened wall adds readings and time.
Access to the wet areas also changes the work. A closed crawl space, a tight attic or a wall cavity that has to be opened in several places takes more time to set up and to read, and that is part of the scope you approve.
Can I run my own fans and dehumidifier?
A household fan and a small dehumidifier can help on a small wet area, but they are not a substitute for a drying plan. They cannot tell you when the materials are dry, and they can dry the surface while the framing stays wet behind it.
If you run your own equipment, keep the doors and windows closed, place the fan so it blows across the wet surface, and empty the dehumidifier regularly. Note the time and the room, so the crew knows what has already been done.
Do not run a generator indoors, and do not plug equipment into a power strip in a wet area. Keep all cords off the floor and out of the water, and turn the equipment off before touching it if it has been in water.