How long does structural drying take?
It takes as long as the readings need. Drying depends on the material, the amount of water, the air in the building and the space around it. The work is finished when the readings reach the dry goal, and a technician explains the expected range on the first visit without promising a date.
Drywall on open framing may dry in a few days, while a solid wall, a subfloor over a crawl space or plaster on lath can take much longer. The readings show the trend, and the crew decides when the trend has levelled off at the goal.
Drying cannot be hurried by turning the heat up or by sealing the room. Warm air holds more moisture but does not move it out of the wall, and sealing a room traps the humidity inside it.
Why does the moisture stay in the walls after the surface feels dry?
Moisture moves slowly from the wet core of a material to its surface, and a surface can feel dry while the wood or masonry behind it is still wet. Readings inside the material show whether the moisture has gone, and a touch test does not.
Wood framing holds moisture in its fibers and at its joints, and it releases that moisture slowly. A sill plate or a stud that sits on a damp foundation can stay wet for a long time after the wall above it has dried.
The technician reads inside the material with a pin meter or a non-invasive reading, and it compares those figures with the goal. The surface is not the measure.
Is mold likely if the drying is slow?
Mold can start on wet wood, paper and drywall within a few days when the moisture stays high. Fast extraction, quick setup of equipment and regular readings lower that risk. A mold problem found after drying is handled separately.
Mold growth depends on moisture, warmth and time, and a room that stays wet for several days is more likely to grow it. That is one reason the readings are taken on every visit, and why a room that is not falling is looked at again.
Any visible growth found during drying is recorded, and it is handled under its own plan after the structure is dry. The technician explains that plan when it is needed.
Can the equipment stay running overnight?
Equipment is set to run unattended only if the set-up is safe and the power, cords and drains are checked. A technician explains the schedule for each room and what to do if a unit stops or the power fails.
Dehumidifiers collect water and need their tanks or drains checked. Air movers can overheat if they are blocked. The crew shows where the equipment is and how to tell if a unit has stopped.
If the power to the area is cut or a unit fails, call the line. Do not try to repair a dryer or move a cord that is in water.
What should be done with the walls once the building is dry?
Once the readings are at the dry goal, the walls, floors and framing can be repaired by the trade that does that work. The drying log is handed over so the repair is planned from measured facts rather than from appearance.
Repairs to plaster, drywall, flooring and framing are outside a drying line. The technician names the kind of work that is needed and the point at which it can begin. A repair over a cavity that is still wet can hide decay or mold, so the readings are checked first.
The log, the photographs and the readings are given to you, and they can be shared with your insurer and with the trade that does the repair.