How long does structural drying take?
There is no fixed number of days. The run depends on the materials that got wet, how deep the water went and how many floors it reached. Plaster and old softwood usually take longer than drywall.
A crew sets the drying plan from the first round of readings, then keeps logging numbers until every material on the list reads dry. A room with only carpet and drywall can finish sooner than a room with plaster walls and a softwood subfloor. Readings, not the calendar, decide when the equipment comes out.
If the readings stop falling, the crew checks for a hidden source or a cavity that has not been opened yet. Drying that stalls is normal in older construction, and it is one reason the crew keeps a written log.
Why does plaster take longer to dry than drywall?
Plaster is thicker and denser than drywall, and it sits on lath that holds water in the gap behind it. Moisture has to travel through that layer before it reaches the air in the room. Drywall is a single thinner board with paper on both faces, so it lets go of water faster.
Plaster can also look dry on the surface while the scratch coat behind it is still wet. A moisture meter reading at the wall base and a thermal image of the cavity together show that gap far better than a hand on the wall.
This is why a fan in the doorway does not solve the problem. Air has to move across the wet surface, and the cavity has to be opened or measured, before the plaster can be called dry.
What moves the price of structural drying?
The main factors are the size of the wet area, the water category, the materials involved, how long the water sat, and how hard the building is to reach. Repairs after drying are priced separately. The price is confirmed on site before any work begins.
Plaster walls, old subfloor and finished basement drywall each add time and equipment. Access matters too: a narrow side yard, a bulkhead stair or a rear addition with a crawl space takes longer to set up and to monitor. A flat that sat empty before the water was found often has more hidden moisture than the visible damage suggests.
Mold that has already started turns drying into containment work, and a plumber's repair is not part of this quote. The emergency stage is explained and approved before work starts, and the rebuild is quoted once someone has seen the dry wall. Nobody can price a drying job honestly over the phone, so the first visit is where the number is set.
Can I run a fan and a dehumidifier myself?
A household fan and dehumidifier can lower the humidity in a room, but they do not measure what is wet inside the walls or floor. Without readings, nobody knows when the materials are actually dry. Running them alone can leave hidden moisture behind.
Drying equipment works best when it is placed for the room and checked against readings. A crew uses meters and thermal imaging to find where the water went and to confirm it has left. Without that, the surface can feel dry while the subfloor or the lath is still holding water.
If you are waiting for a crew, you can move furniture off wet flooring, lift rugs, and keep the room ventilated. Do not start cutting plaster or pulling up floors on your own until you have checked the building's age and the materials.
What should I photograph before the crew arrives?
Photograph the damage before anything is moved, including the water line on walls, the floor, and any damaged ceiling. Take wide shots of each room and close-ups of the affected spots. Keep the photos with the date you took them.
Photos help the crew and your insurer see how far the water travelled. Note where the water came from if you know, and what time you found it. Move valuables out of the wet area only if it is safe to do so.
The crew can add its own moisture readings and photos to your file. Coverage is decided by your insurer under your policy, so call your insurer early and ask what they need from you.