Why does a concrete floor sweat?

Answer

If a concrete floor is sweating, the likely culprit is a condition known as sweating slab syndrome, in which the interior concrete slab's surface occasionally develops moisture as a result of dew point condensation. This makes the surface of the concrete slippery, making it dangerous to move or lift heavy objects while on that surface.

When dew point condensation causes a concrete floor to sweat, humid, warm air makes its way into a structure through open windows, vents and doorways. As the air moves around, it condenses onto any surface it finds that is at or beneath the dew point, which is frequently the floor. When the ambient temperature goes up rapidly, along with the relative humidity, a sweating slab is likely to happen, because the humid air entering the space takes a lot less time to heat the air inside the space than it does the floor. This often leaves the slab cold enough for condensation to happen.

In some cases, when salt deposits are present on the concrete floor, the floor sweats as well. Salt draws moisture from the surrounding air as well as from the concrete. Sometimes moisture develops inside the concrete, pushing the salt in the mixture to the surface, where it attracts more moisture.

Q&A Related to "Why does a concrete floor sweat?"
Wicking can occur when there is a breakdown of the vapor barrier installed beneath the concrete floor. Wicking can also occur if a vapor barrier was not installed prior to pouring
http://www.ehow.com/how-does_5242843_concrete-floo...
Sweat smells because it is mixed with bacteria that lives on your skin. If for example you have been out running, you will break into a sweat and because you have dead skin and bacteria
http://www.ask.com/web-answers/Health/Diseases/why...
Water/moisture will travel through concrete. If the ground under or on the edges is wet, the floor may sweat. If this is the source as opposed to surface condensation, you will begin
http://answers.yahoo.com/question/index?qid=200701...
Possible can of worms there! Generally, sweat is caused by the meeting of two tempertures that are carrying with them different humidity levels. Sometimes the problem is made worse
http://wiki.answers.com/Q/What_if_your_floor_is_we...
1 Additional Answer
Ask.com Answer for: why does a concrete floor sweat
Why Does a Concrete Floor Sweat?
Wicking can occur when there is a breakdown of the vapor barrier installed beneath the concrete floor. Wicking can also occur if a vapor barrier was not installed prior to pouring the concrete. This occurs when water from the soil beneath and surrounding... More »
Difficulty: Easy
Source: www.ehow.com
Explore this Topic
The reason many wine glass might survive a fall onto a carpet versus the concrete floor is very simple generally speaking carpets are very soft and they also have ...
About -  Privacy -  Careers -  Ask Blog -  Mobile -  Help -  Feedback  -  Sitemap  © 2014 Ask.com