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Dehumidification After Water Damage: How It Works

Dehumidification is the part of drying that most people have heard of but few have seen in action. It is the work of pulling moisture out of the air inside a building, so that the air can take on more moisture from the wet materials and the drying can continue. Without it, air movement alone quickly reaches a limit, because the air becomes saturated and cannot absorb any more water. With it, drying becomes a cycle that keeps working until the materials are dry.

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This guide explains what a dehumidifier does in general terms, why drying needs dehumidification as well as air movement, and what to know about the rental question. It is honest about that question: whether dehumidifier rental is offered is a matter for the operator to confirm, and this guide does not present rental as an offered service. What it does is explain the process, so that you understand why the equipment is in your home and what it is doing there.

What a dehumidifier does in general terms

A dehumidifier pulls moisture out of the air and collects it, so that the air in the room becomes drier and can absorb more moisture from the wet materials around it. In a drying job, the dehumidifier works alongside air movers, which push air across wet surfaces so that the moisture in the materials evaporates into the air. The dehumidifier then removes that moisture from the air, and the cycle repeats. The two work together, and neither one is enough on its own for a building that has taken on a significant amount of water.

The water collected by the dehumidifier is removed from the building, usually through a hose to a drain or a container that is emptied as part of the work. The amount collected is a rough sign of how much moisture is coming out of the structure, but it is not a measurement of dryness on its own. Dryness is confirmed by moisture checks in the materials, not by the amount of water in a container. The structural drying and dehumidification page describes this service in general terms.

Why drying needs dehumidification as well as air movement

Air movement alone can only dry a building so far. Moving air across a wet surface encourages the moisture in the surface to evaporate, but once the air is saturated with moisture, it cannot take on any more, and the drying stops. That limit is reached quickly in a closed room, and even more quickly in Florida humidity, where the air already holds moisture before the drying begins. Dehumidification removes that limit by keeping the air dry enough to keep absorbing moisture, so that the drying can continue until the materials are dry.

Opening windows is not a substitute for dehumidification, and in humid conditions it can make the drying slower by letting moist air in. A household dehumidifier is also not a substitute for the professional equipment used in a drying job, because it is not sized for the volume of water involved and it is not monitored with moisture checks. Drying a building after a water loss is professional work, and the equipment is part of that work rather than a separate purchase.

Dehumidification After Water Damage: How It Works — Florida water damage guide

Rental: what is and is not offered

Whether dehumidifier rental is offered is a matter for the operator to confirm, and this guide does not present rental as an offered service. Rental is a research keyword, not a confirmed service, and it should not be assumed that a dehumidifier can be hired on its own, or that hiring one is a substitute for a professional drying job. If rental is something you are considering, ask the operator directly whether it is offered, what it includes, and whether it is suitable for your situation.

The reason for that caution is that a dehumidifier on its own, without air movement, without moisture checks, and without a professional to monitor the drying, is unlikely to dry a building properly. The equipment is only part of the job, and the monitoring is what makes it work. A professional drying job includes the equipment, the setup, the moisture checks and the follow-up, and that whole package is what the drying service covers.

What to expect while dehumidifiers are running

While dehumidifiers are running in your home, expect noise, warmth and a closed-up building. The equipment runs continuously, and it is meant to, because drying is a process that works best without interruption. Keep doors and windows closed in the drying area, as the professional directs, and do not move or turn off the equipment without asking. Note any new stains, smells or soft patches that appear, and report them to the professional, because they can point to moisture that is still moving through the structure.

Keep a written record of the visit and the drying, and ask the professional what the moisture checks showed and how the drying is progressing. In Gainesville and across North Central Florida, the water damage restoration in Gainesville page is the local starting point for the same statewide help described here.

How to tell the drying is working

Telling whether drying is working is not a matter of looking at the surface, because the surface can look dry while the structure underneath is still wet. The way to tell is by the moisture checks, which are repeated as the work goes on, and by the answers the professional gives when you ask how the drying is progressing. Ask what the checks showed, whether the readings are going down, and how the drying is progressing in each room, because those answers tell you more than any look at the surface ever could. A professional who explains the readings in plain words is easier to work with than one who works in silence.

There are also signs you can notice yourself, in general terms, though none of them proves the building is dry on its own. A smell that fades, a stain that stops growing, a floor that stops feeling soft, and a room that feels less damp are all signs that the drying is working, while a smell that gets stronger, a stain that grows, or a new damp patch are signs that it is not. Those signs are worth noting and reporting to the professional, because they help track the drying, but they are not a substitute for the moisture checks.

The amount of water collected by the dehumidifier is another sign, in general terms, though it is not a measurement of dryness on its own. A dehumidifier that is collecting a lot of water is pulling moisture out of the building, which is a good sign, while one that collects less over time may mean the building is getting drier, or it may mean the setup needs to be adjusted. The professional is the person who reads those signs together with the moisture checks, and who decides when the drying is finished, based on the checks rather than on any single sign.

If the drying does not seem to be working, ask for it to be checked again, rather than waiting for it to improve on its own. A reading that is not going down, a smell that is getting stronger, or a stain that is growing are all reasons to ask the professional to look again, and to ask whether the setup needs to be changed. The setup may need more air movement, more dehumidification, or access to a part of the building that has not yet been reached, and those changes are made from the moisture checks rather than from a guess. Do not move the equipment yourself or turn it off in the hope of resetting it, because that can undo the progress that has been made, and the professional is the person who decides how the setup should change.

Key Takeaways

A dehumidifier pulls moisture out of the air and collects it, so that the air in the room becomes drier and can absorb more moisture from the wet materials around it.
Air movement alone can only dry a building so far.
Whether dehumidifier rental is offered is a matter for the operator to confirm, and this guide does not present rental as an offered service.
While dehumidifiers are running in your home, expect noise, warmth and a closed-up building.
Telling whether drying is working is not a matter of looking at the surface, because the surface can look dry while the structure underneath is still wet.

Your Next Step

If this guide matches what you found at home, the next step is a visit — not a guess. Call and describe what you found, and the visit is arranged from what you describe. The Structural Drying & Dehumidification page explains what that service covers, and the water damage restoration page explains how the full job is put together when more than one room is affected.

Do not step into standing water where electrics may be involved, and if water is still coming in, turn off the main water supply for the home where you can reach it safely.

Keep the guides on this site bookmarked: the first guide, the signs guide, and the preparation guide cover the checks worth repeating — after moving in, and after a storm or heavy rain.

Water damage help is available across Florida. See water damage restoration in Hernando, FL for one local example, or find your town on the service areas page.