The four knows to properly drying a structure: removal of standing water, evaporation through air movement, dehumidification and temperature control.

What do the four KNOWS of drying look like in a home or business?


→ Temperature

→ Air Movement

→ Humidity

→ Amount of Water to be Evaporated

How soon should you start drying your house or business? When encountered with floods, water heater spills, or pipe leaks, immediate water mitigation is imperative. The water removal in the home or business needs to happen as quickly as possible to prevent the water from spreading to other unaffected areas. This can also possibly prevent secondary damage, such as mold. The four knows of drying are vital and impacts how long it takes to dry both the structure and the contents. During the drying process, the four knows will be considered to assure an effective mitigation. Because everyone’s situation is different, the time necessary to dry and restore the house or business and the belongings differ.


Temperature Control. This is the most complex of the drying principles. All drying equipment works best at specific temperatures. Most dehumidifiers work best between 70 and 90 degrees. Some materials will dry more quickly when the surface temperature is 90 degrees or higher.

Air Movement

When a room has experienced water damage, it can often be damp and humid. Air movement involves blowing warm, dry air in and blowing the moist air out. Industrial strength air movers are used to accomplish this. As the drying process proceeds, the techs position the air movers to promote even thorough drying. 


The measure of moisture the air is currently retaining at a given temperature is relative humidity (RH). It is determined by the ratio of water vapor in the air compared to the amount of water vapor the air can contain. If the RH is over 60%, drying time becomes slower due to the air’s saturation. The moisture in the air needs removing at this point. Dehumidifiers are the most effective at lowering the relative humidity.

Amount of Water to be Evaporated

The more liquid water removal there is, the less water vapor needs to be removed by dehumidifiers. Physically extracting as much water as possible from the scene is the most efficient way to remove water in a building is to physically use a vacuum to extract it.

Effective Drying and Timing Wet Out Restoration works diligently to quickly return your home and or business back to its previous condition, realistically considering the proper drying time needs to be implemented. For successful drying you will need to have the right humidity levels, the correct temperature, accurate water extraction, and air movement. If water attacks your home, call a certified water damage professional, Wet Out Restoration responds to water damage emergencies 24 hours a day, 7 days a week, 365 days a year. Call one of our water damage experts for a free inspection. Wet Out Restoration 1532 SE Village Green Drive. Unit I Port St Lucie, FL 34952 1-866-316-2826

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