How long does structural drying take?
Drying runs until the readings match the dry targets for each material. That depends on how wet the materials were, how thick they are, how cool the space is and how well the air moves. The crew sets a plan on the first visit and reports progress each day until it is complete.
There is no fixed number of days that works for every house. A thin layer of water on a finished concrete floor dries far faster than a soaked wall with insulation behind it. Wood framing holds water longer than drywall, and the coldest rooms in a Spokane basement dry more slowly than the warm ones upstairs.
That is why the readings matter more than the calendar. Drying is finished when the framing and subfloor read dry, not when the room feels dry to the hand. A crew that stops early leaves moisture in the cavities, and a crew that keeps the equipment running past the target spends money without adding any drying.
Why does the moisture stay in the framing after the floor looks dry?
Wood and insulation absorb water and release it slowly, so the surface can look dry while the material underneath is still wet. Drying is measured inside the material, which is why meters are used on the framing, the subfloor and the cavity.
Wood fibers hold water in their cell walls, and that water moves outward slowly. A floor that looks dry can still be wet a few centimeters down. Insulation batts behave the same way, holding water like a sponge until they are opened and aired out.
Left in place, that moisture is what allows rot to start in sills and joists, and what allows odors and mold to develop inside a closed wall. Structural drying is the step that brings the material back down to a reading the framing can tolerate, and the meter record is the proof that it has happened.
What affects the price of drying here?
The size of the area, the number of rooms and floors, how many cavities have to be opened, how wet the materials are and how many days the equipment must run all change the work. The price is explained and approved on site before any equipment is placed.
A small basement with wet carpet and a damp sill takes less equipment and fewer visits than a split-level with water in the lower level, the stairs and the living room above. Each added room or cavity adds equipment, monitoring and time, and each of those is part of the quote.
The age and construction of the building matter too. Older houses often have plaster on lath, wood framing that is deeper than modern studs, and cavities that are hard to reach. Those features do not change the method, but they change how long the drying runs and how much is opened.
Can I run a dehumidifier from the hardware store instead?
A consumer dehumidifier removes some moisture from a room, but it is not sized or placed to dry framing and subfloor. It also does not give the readings that show when drying is complete, which is what the insurer and the repair crew need.
A household unit is rated for the air in a room, and it can run for many hours without drying a wall cavity or the space under a floor. Using one in a basement full of wet materials can make the room feel better while the structure stays wet, and that is the hidden part of the damage.
A household unit may still help once a professional crew has finished, to keep the air moving in a closed room while the repairs are made. Ask the crew whether that is useful for your house and for how long.
What should I keep off wet floors and walls during drying?
Keep rugs, stored boxes and furniture away from wet floors and off wet walls while the equipment runs. Do not seal the room with plastic or tape over vents, and do not cover the equipment, because it needs air to work.
Anything that rests on a wet surface holds moisture against it and slows drying underneath. Move furniture onto dry ground where possible, and set rugs and boxes aside until the room is dry. Closets and cabinets against an outside wall should be emptied and opened.
Do not close a room tight while the equipment runs unless the crew asks you to. Sealed rooms trap the moisture the dehumidifier is pulling out, and they can allow a damp smell to build up. Keep the furnace and any gas appliance running as the crew directs, because the house must be heated to dry evenly.
