What does structural drying actually remove from a building?
Structural drying removes the water that has soaked into the materials of the building, not only the water that was visible. It works on framing, subfloors, drywall, insulation and sometimes masonry. The drying equipment moves moisture from the materials into the air and then removes it from the room.
Wood, drywall and insulation hold moisture in their fibers and their cavities. Air movers blow across the surface to lift the moisture away, and the dehumidifier takes the water out of the air so the room can keep drawing it from the materials. Both are needed. Air movers alone can push moisture into the room air, and a dehumidifier alone is too slow to reach deep into a wall.
The drying target is a measured level for each material. It is set from the readings of dry material in the same building, not from a rule of thumb. The crew explains which target applies to which material before drying begins.
How long does structural drying take in Honolulu?
The time depends on how wet the materials were, how much of the structure is involved and how humid the outside air is. There is no fixed number of days. The crew sets the plan from the readings and takes new readings on each return visit, and the equipment is removed when the target is reached.
A lightly wet room with a few wet baseboards can dry in a shorter time than a building with water in the walls and the subfloor. Humid weather lengthens the time, because the air is already holding moisture. The crew will tell you when it expects the next set of readings and what the readings must show before the equipment comes out.
Do not remove the equipment early because the surface looks dry. A surface can be dry while the framing behind it is still wet, and removing the equipment at that point lets the moisture return to the surface later.
How do you know when a wall is dry?
A wall is dry when the moisture readings inside the cavity and on the surface have reached the target for the materials involved. The crew measures the drywall, the framing and the insulation separately, because they dry at different rates. A wall that reads dry on the face is not enough on its own.
Readings are taken at several heights along the wall and at the corners and the base, because moisture collects in low spots. The readings are compared with readings from a dry wall in the same building, so the target reflects the building rather than a general figure.
Where a wall has been opened, the crew checks the framing and the bottom plate for moisture and for any soft wood. Soft wood is removed and replaced, and the readings are repeated before the wall is closed.
What should the homeowner expect on each return visit?
On each return visit the crew takes fresh readings, checks the equipment and moves it if the plan says so. It shows the homeowner the readings compared with the last visit, and it explains any change in the plan. A return visit that shows a reading going up rather than down is treated as a sign that the source may still be active.
The return visit is also the time to check the materials that were not opened. Paint, trim and cabinet bases are looked at for swelling, staining and bubbling. Any change is recorded and photographed, so the homeowner has a record of how the building changed while it dried.
Keep the drying equipment running as the crew sets it, and do not move the units to a different room yourself. If a unit stops or a room feels much warmer or more humid than the crew's notes, call the line. The crew can check the equipment remotely by asking the homeowner to read a gauge, and it will come back if the problem is not simple.
What should a building look like when drying is finished?
A finished drying job has materials at the target readings, equipment removed, the openings closed and a written record of every reading. The surfaces are checked for any stain, residue or swelling that remains. The room is ready for repair only when the readings show it is dry, and the record is handed over with the work.
The crew compares the final readings with the starting readings and shows the homeowner the difference. It notes any material that did not reach the target and explains the reason, which may be that the material must be replaced rather than dried.
Repairs are a separate job. Rebuilding drywall, laying a new floor or painting is done after the readings are dry and the record is complete. The homeowner can choose who does the repair, and the crew's record is available to whoever is hired.