How to stop cement from sweating in spring?

[barryh]

Actually, a dehumidifier does create heat. When we were first married and living in a small bottom floor apartment where there was a slab of concrete under the carpet, we heated the whole space with a dehumidifier. All those watts of energy that a dehumidifier consumes have to go somewhere.

I've also found a dehumidifier heats the space.

 

[ripcord]

I wonder if there is a vapor barrier underneath that slab?

 

[Chris142]

Would a whirly bird on the roof stop it?

 

[Rmay635703]

I've also found a dehumidifier heats the space.

Dehumidifiers make immense amounts of heat compared to a space heater, what for watt you get about 3x more heat than electricity you use.

Oddly my cheap Aldi portable ac dumps immense amounts of water, very comparable to a dehumidifier

 

[burbguy82]

Concrete pads WITHOUT a vapor barrier will condensate, those poured with a vapor barrier will not condensate. It is that simple

This is the reason why a vapor barrier on buildings must have a vapor barrier are required by building code.

 

[CR94]

... All those watts of energy that a dehumidifier consumes have to go somewhere.

Yes, the electric energy the dehumidifier consumes adds to the heat released by condensing water vapor into liquid. The air exhausted by the dehumidifier is much warmer than air that would be exhausted by a (hypothetical) electric heater that consumes the same power and moves the same volume of air.