High Humidity in Crawl Space

High humidity in crawl spaces is a common problem that can cause serious damage to your home and health. Signs of high humidity may indicate a larger problem with your crawlspace, such as mold or mildew growth.

Hygrometer showing high humidity levels, a sign that needs action to reduce the humidity levels in crawl spaces in Northern VA.

Reduce High Humidity in Crawl Spaces in Northern Virginia, Shenandoah Valley, North Central Virginia, and West Virginia

Is your home experiencing a musty smell, mold growth, or warped floors? These are just a few of the warning signs of high humidity in your crawl space.


Crawlpaces are often overlooked areas of a home but can have a significant impact on indoor air quality and overall home health. High humidity in crawl space is one of the signs of crawl space problems that homeowners should not ignore. If left unaddressed, it can lead to mold growth, foul odors, and structural damage.


If you notice changes in crawl space humidity in your home, contact the professionals at LUX Foundation Solutions. We can help you identify and solve high crawl space humidity issues,  as well as other common crawl space problems, through our comprehensive home inspection and repair services to address the problem effectively for a permanent and long-term solution.


Contact us today to schedule a free estimate and learn more. We proudly serve homeowners in Northern Virginia, Shenandoah Valley, North Central Virginia, West Virginia, and surrounding areas.

Do These Signs of High Humidity in Crawl Space Seem Familiar?

The symptoms

High humidity can wreak havoc on your home. Here are some common symptoms of high humidity in your crawl space: 


  • Mold and mildew growth 
  • Musty odors 
  • Visible condensation on pipes and other surfaces 
  • Buckled or warped wood floors 
  • Increased energy bills
  • Heightened Allergy or asthma symptoms

If you are experiencing any of these symptoms, contact LUX Foundation Solutions for a free crawl space estimate. Our experts will identify the root cause of your high crawl space humidity and provide solutions to prevent future damage.

What Causes High Humidity Crawl Space?

Several factors can contribute to high humidity in crawl space, including:

An open crawl space vent allows moisture to get in, which causes high humidity in crawl space in Front Royal, VA.

Open Crawl Space Vents

Many crawl spaces originally had open vents along their foundation walls, intended to release humidity. However, this concept backfired, as these vents exposed the crawlspace to external weather conditions. 


For instance, on hot and humid summer days, these vents allowed outdoor humidity to enter, increasing moisture levels beneath the home. This excess moisture can lead to various problems in the crawlspace. In summary, open vents contribute significantly to maintaining unsuitable crawl space conditions.

Crawl space ceiling with water drops forming, indicating precipitation can cause high humidity in crawl space in Fairfax, VA.


When rain or snow falls, the soil absorbs water, which can eventually seep into the ground beneath your crawlspace, and if it lacks proper waterproofing or drainage systems, this water can easily penetrate through the foundation walls or floor. Over time, this water vaporizes and gets trapped beneath your house. 


This trapped moisture raises the temperature and humidity levels in your crawl space. Consequently, condensation develops on wooden support beams and insulation, resulting in additional damage to your crawlspace foundation.

A damp crawl space with leaking pipes and water accumulation, a cause of high humidity in crawl space in Flint Hill, VA.

Leaking Pipes

Even small plumbing leaks within your home can significantly impact crawl space humidity. The water from these leaks can gradually accumulate in the crawlspace, raising humidity levels. 


Additionally, the moisture can foster an environment conducive to wood rot and mold growth. Regularly inspect your plumbing for leaks, no matter how minor they may seem, and promptly address any issues to prevent crawl space humidity problems.

A crawl space with an exposed dirt floor and dampness that can cause high humidity in crawl space in Martinsburg, WV.

Dirt Crawl Space

A crawl space with a dirt floor is inherently prone to humidity issues. Soil naturally contains moisture, and this moisture can evaporate into the crawl space air, raising humidity levels. Without proper encapsulation or a vapor barrier, the dirt floor can contribute to excessive moisture in the crawlspace. Installing a moisture-resistant vapor barrier or encapsulating the crawlspace can mitigate this problem.

A crawl space with standing water, showing flooding as a significant cause of high humidity in crawl space in Charles Town, WV.

Rain and Flooding

Water intrusion is a primary concern for crawlspaces in areas susceptible to heavy rain or flooding. Flooding or even minor water seepage can result in extremely high humidity levels. 


Implementing effective waterproofing measures, maintaining sump pumps, and ensuring proper grading around your home are essential steps to prevent water from entering your crawlspace during rainy or flood-prone seasons.

A pipe with flowing and stagnant water, showing poor drainage that can cause high humidity in crawl space in Stephens City, VA.

Poor Drainage Systems 

Inadequate drainage systems around your home can worsen crawl space humidity issues. Improper grading or malfunctioning gutters can direct water toward your foundation, increasing the risk of moisture infiltration. Regularly maintain your drainage systems to ensure they divert water away from your crawlspace, preventing humidity problems.

Crawl space ventilation with excessive dirt showing poor ventilation can cause high humidity in crawl space in Alexandria, VA.

Poor Ventilation or Air Circulation

Inadequate ventilation and poor air circulation in a crawlspace can trap moisture, creating a breeding ground for humidity-related issues. Insufficient ventilation prevents the exchange of moist air with drier outdoor air, causing humidity levels to rise. This can lead to problems like mold, condensation, wood decay, and unpleasant odors. 


To address this, install vents, fans, or dehumidifiers to enhance air circulation, allowing dry air to flow into the crawlspace and maintain lower humidity levels.

Dampness and water leaks in the crawl space floor and wall that can cause high humidity in the crawl space in Reston, VA.

Water Leaks or Foundation Cracks


Water intrusion through foundation cracks poses a significant threat to crawl space humidity. These openings permit rain, snowmelt, or plumbing leaks to infiltrate the crawlspace, elevating moisture levels. 


To prevent crawlspace humidity problems and structural damage, regularly inspect for signs of water intrusion like dampness, standing water, or visible cracks. Promptly address these issues by sealing cracks, repairing foundations, or fixing plumbing leaks.

A hygrometer in a window with condensation, showing a high humid climate, can cause high humidity in crawl space in Linden, VA.

High Humid Climate

Living in a region with consistently high humidity levels can pose ongoing challenges for crawlspace management. In Virginia, humidity averaged 76% in September. In such climates, crawlspaces are especially susceptible to moisture-related issues. 


To combat this, consider investing in dehumidification systems specifically designed for crawlspaces and implementing encapsulation techniques to create a barrier against external humidity.

To ensure your crawlspace stays dry and healthy, it is essential to address the underlying cause of high humidity. At LUX Foundation Solutions, we use advanced techniques to identify the root causes of high crawl space humidity. We offer a range of solutions to tackle your crawl space problems, from encapsulation to dehumidification. Our experts can help you choose the best solution for your specific needs.

Our Solutions

Crawl space encapsulation in Flint Hill, VA, a solution to prevent moisture and address high humidity in crawl space.

Crawl space encapsulation

Installation of crawl space insulation in Southbridge, VA, a solution to address moisture that causes high humidity in crawl space.

crawl space insulation

A crawl space drainage installation in Linden, VA, an effective solution to mitigate moisture and high humidity in crawl space.

crawl space drainage

Crawl space dehumidifier

Crawl Space dehumidifier

A man doing proper closure of vent and door in Manassas, VA, a solution to manage air that causes high humidity in crawl space.

Proper closure of crawl space vents and doors

How to fix high humidity in my crawl space?

If you’re experiencing high humidity in your crawl space, it’s important to address it promptly. Excess moisture can lead to mold growth, pest problems, and even structural damage to your home. At LUX Foundation Solutions, we recommend a multi-step approach to fixing high humidity in your crawl space. 


The first step is to remove any standing water. This can be done with the help of a sump pump or other drainage system. Once the standing water is gone, it’s important to consider installing a crawl space drainage system to prevent future moisture buildup.


Next, we recommend permanently sealing your crawl space vents. This may seem counterintuitive, but open vents can actually increase humidity levels in your crawl space. Proper closure of crawl space doors and vents, can better control moisture levels inside your home.


Another important step is to encapsulate the crawl space.  Installing a vapor barrier will help prevent moisture from rising up into your home from the dirt floor of your crawl space. The barrier will also help keep pests and other unwanted visitors out of your crawl space.


Finally, add a dehumidifier to your crawl space. This will help maintain stable and healthy humidity levels once the encapsulation process is complete. With these solutions, you can be confident that your crawl space will remain dry, healthy, and free from mold and other issues.

Do I need to insulate walls to prevent high humidity in crawl space?

Crawl Space Insulation is worth considering if you are experiencing high humidity in your crawl space. Insulating the walls of your crawl space adds an extra layer of weatherproofing, which helps to control the humidity level by slowing down the rate at which warm, moist air enters the space and cooling the air as it does. 


Insulation also helps to prevent excess moisture from entering the area by blocking any moisture that may be present in the air or ground from entering. This can lead to improved indoor air quality, reduced energy costs, and increased comfort in your home.

At LUX Foundation Solutions, our crawl space insulation experts can help assess the condition of your crawl space and determine the best approach for your unique situation. We use high-quality insulation materials and advanced installation techniques to ensure long-lasting results and optimal performance. Contact us today to learn more about crawl space insulation and how it can benefit your home.

How can crawl space humidity harm my home?

Crawl space humidity poses a significant risk to your home. High humidity levels in this concealed area can lead to various issues. One of the most concerning problems is its potential to compromise the structural integrity of your home. 


Excessive humidity can result in wood rot and mold growth, which, over time, can lead to costly repairs and reduce your property’s value. Moreover, crawl space humidity can also affect your indoor air quality. It provides the ideal conditions for mold and mildew to thrive, releasing spores into the air. These spores can make their way into your living spaces, potentially causing respiratory problems and allergies for your family.


To combat crawl space humidity, crawl space encapsulation is a highly effective solution. This process involves sealing the crawl space with a vapor barrier, which acts as a shield against moisture intrusion. In many cases, encapsulation includes the installation of dehumidification systems to maintain optimal humidity levels. 


LUX Foundation Solutions aims to protect homes, improve indoor air quality, and safeguard property values. Trust us to provide expert crawl space encapsulation services, ensuring a healthier and more resilient home.

Take Control of Your Crawl Space Humidity with LUX Foundation Solutions Today.

Don’t let high humidity in your crawl space go unchecked!


If you’ve noticed signs of high crawl space humidity and you’re worried about your home’s health, reach out to our team at LUX Foundation Solutions. We are dedicated to delivering effective and efficient home solutions. Our team of experts specializes in protecting properties from dampness, humidity, and the resulting damage with crawlspace encapsulation to reduce indoor humidity levels and create a comfortable and healthy environment.


Our crawl space encapsulation service encompasses various steps, including closing off crawl space vents, installing the durable vapor barrier, sump pumps, and dehumidifiers, addressing standing water issues with waterproofing techniques to control moisture and mold growth, protecting the integrity of your home’s foundation, and improving air quality. This comprehensive approach guarantees the best outcome, customized to meet your home’s specific needs.


Take the first step towards a healthier home. Contact us today at 540-508-8587 or fill out our online estimate request form to schedule a free, on-site estimate. We offer crawl space repair services in Northern Virginia, Shenandoah Valley, North Central Virginia, West Virginia, and surrounding areas.

Request a free Estimate


How to lower humidity in crawl space?

To lower humidity in a crawl space, it’s crucial to seek help from a professional crawlspace repair service such as LUX Foundation Solutions. We will assess the area to determine the root causes and underlying issues contributing to the high humidity levels. 


Our experts can recommend and implement effective solutions, such as encapsulation, dehumidification systems, and proper ventilation, tailored to your specific situation. Lowering humidity not only prevents structural damage but also improves indoor air quality and energy efficiency in your home.

What should humidity be in crawl space?

The ideal level of crawl space humidity ranges between 40% to 60%. However, it’s essential to consult LUX Foundation Solutions to determine the specific humidity requirements for your unique situation. We can thoroughly assess any underlying issues contributing to high humidity and tailor a solution accordingly. 


Seeking assistance from our experts is crucial to maintaining structural integrity and enhancing indoor air quality and overall energy efficiency within your home. Don’t hesitate to contact a crawlspace specialist to ensure a healthy and well-maintained environment beneath your home.

What is considered high humidity in a crawl space?

High humidity in a crawlspace is considered when the relative levels consistently exceed 65%. However, it’s essential to bear in mind that the definition of “high humidity” can vary based on your specific location and circumstances. To accurately assess and address these concerns in your crawlspace, it’s advisable to consult a professional crawl space repair service.

How to control humidity in crawl space?

To effectively control crawlspace humidity, consider the following steps:


  1. Moisture Barrier: Install a high-quality moisture barrier or crawl space encapsulation system. This seals off the crawlspace from the ground, preventing moisture from entering.
  2. Ventilation: Ensure proper crawl space ventilation. A balanced ventilation system helps to circulate air, reducing humidity levels. Install vents equipped with fans and dehumidifiers if necessary.
  3. Dehumidification: Invest in a crawl space dehumidifier designed to maintain optimal humidity levels. These devices can remove excess moisture from the air, preventing mold and structural damage.
  4. Grade and Drainage: Ensure that the ground around your home slopes away from the foundation to prevent water from pooling near the crawlspace. Proper drainage systems, like gutters and downspouts, can also help divert rainwater away.
  5. Seal Leaks: Seal any cracks or gaps in the crawlspace walls and foundation to prevent outside moisture from infiltrating.
  6. Insulation: Insulate the crawlspace to maintain a stable temperature, reducing the risk of condensation and humidity buildup.
  7. Regular Maintenance: Periodically inspect and maintain your crawlspace. Ensure that your chosen solutions are functioning correctly and address any issues promptly.

Consulting with LUX Foundation Solutions is highly recommended for the most effective control of humidity in your crawlspace. We can assess your specific situation, identify underlying problems, and tailor a comprehensive solution to keep humidity levels in check. This proactive approach not only preserves the integrity of your home but also contributes to better indoor air quality and energy efficiency.