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High Humidity

The presence of high humidity in a home indicates the presence of a wide range of more serious problems within the property. As a result, it's an issue that you must not overlook!

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Humidity is one of the most insidious threats to your home’s structure, furniture, and even your health and well-being. High relative humidity can occur for a variety of reasons, both structural and cosmetic. Humidity can both cause and exacerbate structural deterioration.

Problems Associated with High Humidity

There are many ways you will know there is a problem with high humidity in your crawl space. Here are the most common things you will notice:

mold in crawl space


If you observe mold spreading across regions of your home that do not have any water outlets of any kind, this is very strong evidence that you have high levels of humidity in your home. High levels of humidity can cause mold to grow. Mold and mildew can be identified by the way in which it grows and spreads across surfaces such as wood, wallpaper, tiles, and even fabrics. You will be able to distinguish mold and mildew in this way. There are even some species of mold that thrive best inside of HVAC systems (which can spread the smells very quickly).

nasty, smelly crawl space

Musty Odors

When water finds its way into your crawl space, it begins to permeate certain surfaces, like wood and any other organic material. Once water has invaded your crawl space, it is now susceptible to high humidity. Over time, this extra moisture will create a musty odor. This unpleasant smell will quickly spread from your crawl space to the livable areas of your home. This creates a smelly environment where you can’t seem to find the source of the odor. If you can’t find the source, then it is very likely that the problem has to do with excess humidity in your crawl space.

Water in crawl space

Crawl Space Water

Standing water around your home or in your crawl space indicates that your foundation is suffering from moisture and humidity issues. They will cause dampness unless drained or otherwise removed. Standing water indicates structural issues or interior leaks. This suggests your home may have more problems. The location and amount of water can help you identify the source. If most of the water is in your walls and flooring, it’s likely seepage or a leaking pipe. If crawl space water is unevenly distributed, foundation difficulties may be to blame.


We know that high humidity might not seem like the most serious problem in your home, but you should be worried if it stays that way for a long time. Humidity and dampness can damage your home in a lot of different ways. Some of these problems will last longer than others. Most of the time, high humidity for a long time causes wood to rot and mold to grow. Small animals like rodents and bugs like to live in dark, damp places, so your crawl space is the best place for them to live. 

If mold grows in the crawl space of your home, it can cause a number of serious health problems. Mold is dangerous for people who already have trouble breathing, but it can also hurt people who are otherwise healthy. If someone in your house has severe allergies or asthma, you need to take care of any mold problems soon. Some molds can even cause asthma or allergies to get worse. If you do what you need to do to get rid of mold in your crawl space, your family will be less likely to experience these serious health problems. 

The worst thing about crawl space water isn’t the water itself. Water in the crawl space can lead to bigger problems that can cost a lot to fix. Mold spores are drawn to water. They eat wood, but they can’t get to it without water. So a large pool of water that doesn’t move and soaks wood is the perfect place for mold to grow. Unwanted animals will be drawn to a safe, enclosed space with its own water source. Rats, snakes, and other animals like to live in crawl spaces that are damp. 

Call Us for A Free Inspection 

In our more than 35 years of experience, our team at Mount Valley Foundation Services has seen it all when it comes to crawl space problems, including the effects of high humidity. We are familiar with the challenges homeowners in Charleston, Columbia, and Savannah face because of the region’s humid climate, and we have the solutions to help combat them. 

You can rest assured that we will complete your crawl space repair project with the utmost care, efficiency, and quality. We have earned various awards including the HomeAdvisor Elite Service Award. Thousands of South Carolina homeowners trust us, and you can too.  Contact us today to schedule your free crawl space inspection and no-obligation repair estimates with one of our experts. 

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