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Where does the moisture in my crawl come from?

Part 2 of our series on Crawl Space Moisture Control.

 

Where does the moisture in my crawl come from? The answer is typically one or a combination of: humidity, condensation, evaporation, and precipitation. This post will deal with the first three: humidity, condensation, and evaporation.

Crawl Space Moisture Control

Imagine it’s July and you are cutting the grass. You have just made your last cut and your spouse walks out the back door with a big glass of iced tea. When you grab the glass, its wet on the outside. Why? It was dry when it was pulled from the cabinet so why is it wet? Most of us know that it’s from condensation, which was caused by a significant temperature change. The tea is cold and when that hot, humid July air hits the glass it instantly cools. Cold air holds less water so the remainder sticks to the the glass (condensation).

So let’s take that example and imagine your crawl space. It’s still July, your foundation is made of porous block and the vents are open. The hot humid air seeps into the crawl space where there is little sunlight and usually air conditioning ducts. So what happens? The same thing that happened to the glass of iced tea, but now on a much larger and more costly scale. The air condenses as it comes in contact with the cold air conditioning ducts, cool sub-floor, floor joists, and insulation. Now, you have 100′s of gallons of water in a formally dry space and it never rained a drop. You can probably see how this is a problem.

Next time: The effects/problems of a wet crawl space and the remedies.

If you would like an honest, no obligation crawl space inspection please call HomePro at 757-499-1078. The inspection is no cost but could save you $1000′s in prevented damage.

 

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