Why do you measure moisture instead of checking by feel?
Feel and appearance miss water held inside materials. A moisture reading compares the material against a dry reference, which shows whether it is still holding water and whether the trend is going in the right direction.
A hand on a wall can tell a technician that the surface is cool, but it cannot tell whether the moisture is three inches back inside the cavity. Materials that look dry often hold a reserve that keeps rising to the surface for a while after the equipment has been running. A reading shows what is actually there.
The technician uses pin-type and pinless meters and records each reading against a location in the house. The log is the same record a second technician would use, so the job can be followed and checked by anyone reading it, including an insurance adjuster.
How do air movers and dehumidifiers work together?
Air movers speed evaporation from the surface of wet materials, and dehumidifiers remove the water vapor that the moving air carries. Used together, they keep the moisture leaving the materials from simply moving back into them.
An air mover is a fan that is aimed to skim across a wet surface. It increases the rate at which water leaves the surface, but it does not remove the moisture from the room. Without a dehumidifier, that moisture would settle back onto cool surfaces or into the materials that are still drying.
A dehumidifier cools air to condense water vapor and collects the water it produces. Its effect depends on the room being closed up, so doors and vents are set to keep the air where the equipment can work on it.
How long does structural drying usually take?
The length depends on the materials, how much water was held, how deep it reached and how the building was closed up while it dried. The readings, not the calendar, decide when a room is dry.
A room that held water on the surface and in a thin layer of drywall can dry much faster than one with water in a subfloor or a wall cavity. Solid wood and thick insulation hold water longer, and a closed house with the air already humid takes more time than one that is aired out.
The technician gives an honest estimate of how the readings are expected to fall, and that estimate is updated as the readings come in. No arrival time or completion date is promised on the phone, because the job depends on what the crew finds once the walls and floors are open.
Will drying stop mold?
Drying removes the moisture that mold needs, which makes growth less likely. It does not remove mold that has already started, and a surface that has grown mold needs its own assessment before it is cleaned or covered.
Mold grows on damp organic material, such as paper, wood, dust and some paints. The sooner the material reaches dry, the less chance it has to support growth. That is why drying starts as soon as the free water is removed and why the readings are watched closely in the first days.
If the technician sees growth on a surface, the drying plan notes it and stops short of covering it. Work on mold has its own steps and its own questions, and the separate page on mold after water damage sets out what to ask before that work begins.
What affects the cost of a drying job?
The size of the wet area, the number of materials that have to be opened, the access to the cavities and the length of time the equipment runs all shape the job. No price is given on the phone, and the figure is explained and approved on site before drying begins.
A small room with wet drywall and a dry subfloor is a different job from a whole level with a wet subfloor and wet cavities behind several walls. Every additional opening, every extra piece of equipment and every extra day the readings take to fall adds to the total, so the technician explains each part of the plan as it is set.
The records from the job, including the readings, the photographs and the equipment log, are part of what you receive. They show why the work was needed and how it was carried out, which is useful for your own file and for any claim.