How To Get Rid Of Moisture Under House

Excess moisture can lead to a range of problems, including mold growth, structural damage, and even health hazards. Fortunately, there are effective ways to combat this issue and create a drier, healthier living environment.

Quick Answer

To eliminate moisture under your house, focus on improving drainage and ventilation. Install proper gutters and downspouts, ensure the ground slopes away from the foundation, and use fans or dehumidifiers to increase air circulation.

We’ll provide you with actionable steps and expert advice on how to mitigate these issues and prevent moisture-related complications. 

From proper ventilation systems and insulation to effective drainage solutions and moisture barriers, we’ll provide you with expert insights to tackle this challenge head-on. 

By following our step-by-step instructions, you’ll be able to create a dry and healthy environment beneath your house, ensuring long-term stability and peace of mind.

Causes of Moisture Under the House

1. Improper Drainage System

  • a. Insufficient Slope: When the ground surrounding your house does not have enough slope or grading, rainwater can accumulate near the foundation. This stagnant water can seep into the foundation, leading to moisture problems such as dampness, mold growth, and potential structural damage.
  • b. Clogged Gutters and Downspouts: Gutters and downspouts play a crucial role in directing rainwater away from your home. However, if they become clogged with leaves, debris, or dirt, water overflows and spills near the foundation. This can saturate the ground and contribute to moisture-related issues.

2. Inadequate Ventilation

Crawl spaces beneath the house need proper ventilation to prevent moisture buildup. Without adequate airflow, condensation can occur, leading to elevated humidity levels. This excess moisture can create an ideal environment for mold growth, wood rot, and musty odors.

3. Plumbing Leaks

Leaks in the water supply lines, sewage pipes, or drain lines beneath your house can introduce moisture into the foundation and crawl spaces. These leaks may go unnoticed for a long time, allowing water to accumulate and contribute to dampness and humidity problems.

4. Groundwater Issues

A high water table refers to the level at which the ground is saturated with water. If your area has a high water table, the pressure exerted by the groundwater against the foundation can lead to moisture-related issues. This hydrostatic pressure can cause water to seep into the basement or crawl spaces, resulting in dampness, mold growth, and structural damage.

5. Insufficient Insulation

A vapor barrier is a material designed to impede the migration of moisture from the soil into the foundation or crawl spaces. Moisture can migrate upward if the crawl space or foundation lacks a proper vapor barrier or if the existing one is damaged or improperly installed. This can result in high humidity levels, condensation, and the potential for mold growth.

6. Natural Factors

During periods of excessive rainfall or flooding, large amounts of water can infiltrate the area surrounding your house. This can lead to significant moisture intrusion under the house, affecting the foundation and crawl spaces. The excess water can saturate the ground, seep into the foundation, and create ideal conditions for moisture-related problems like mold, rot, and structural issues.

Effective Solutions for Moisture Removal

How To Get Rid Of Moisture Under House

Moisture-related problems can wreak havoc on your property, leading to structural damage, mold growth, and unhealthy living conditions. To effectively combat moisture issues, it’s essential to employ quality-based solutions that address the root causes. Here are some tried-and-true methods to remove and prevent moisture:

Proper grading and drainage: 

One of the fundamental aspects of moisture control is ensuring that water flows away from your property. This involves expertly grading the landscape to slope away from the foundation and implementing efficient drainage systems. By redirecting water away, you minimize the risk of water seeping into basements or crawl spaces.

Vapor barriers:

Installing high-quality vapor barriers provides an extra layer of defense against moisture intrusion. These barriers, typically made of plastic sheeting or specialized membranes, prevent water vapor from permeating through walls or floors, safeguarding your living spaces from dampness and potential damage.

Ventilation systems: 

Adequate ventilation is crucial for maintaining optimal indoor air quality and controlling moisture levels. Implementing well-designed ventilation systems, such as exhaust fans in kitchens and bathrooms, helps expel excess moisture generated by everyday activities. Whole-house ventilation systems can further enhance air circulation and reduce humidity throughout your home.


Investing in reliable dehumidifiers is a practical solution for areas prone to high humidity. These appliances work diligently to extract moisture from the air, effectively reducing dampness, preventing condensation, and inhibiting the growth of mold and mildew.

Sump pumps: 

If you have a basement or live in an area with a high water table, a robust sump pump is essential. These devices automatically remove accumulated water that may enter your basement due to heavy rainfall or water seepage, ensuring a dry and secure environment.

Foundation repairs:

Cracks and gaps in the foundation can be major culprits for water infiltration. Employing skilled professionals to inspect and repair any foundation issues is crucial for preventing moisture problems and maintaining the integrity of your property.


Effective insulation not only improves energy efficiency but also acts as a barrier against moisture. By properly insulating walls, roofs, and floors, you create a more comfortable indoor environment while minimizing the risk of condensation and moisture-related issues.


Enhancing the water resistance of your property is paramount. Applying high-quality waterproof coatings or sealants to exterior surfaces, such as basement walls or foundations, provides an extra layer of protection against water intrusion and potential damage.

Sealing gaps and cracks:

Inspecting and sealing gaps and cracks in windows, doors, walls, and other areas can help prevent moisture from entering your home. This also helps improve energy efficiency by reducing drafts.


Strategic landscaping can help divert water away from the foundation. This may involve grading the yard, installing French drains, or using retaining walls to redirect water flow.

Routine maintenance: 

Regularly inspecting and maintaining your property, including roof, gutters, plumbing, and other systems, can help identify and address moisture-related issues before they become significant problems.

Addressing indoor humidity:

Controlling indoor humidity levels through the use of air conditioning, proper ventilation, and limiting moisture-producing activities (like cooking without venting or drying clothes indoors) can help prevent excess moisture buildup.

Maintenance and Long-Term Moisture Control Tips

Here are some maintenance and long-term moisture control tips that include proper drainage systems, foundation ventilation, gutters and downspouts, as well as moisture barriers and insulation.

  1. Proper Drainage System:
  • Install a functional drainage system with proper downspouts, gutters, and grading.
  • Clean gutters and downspouts regularly to prevent clogging and ensure proper water flow.
  • Ensure the grading slopes away from the foundation to prevent water pooling.
  1. Foundation Ventilation:
  • Install vents or fans for proper ventilation in crawl spaces and basements.
  • Regularly inspect for water intrusion or excessive moisture and address issues promptly.
  1. Gutters and Downspouts:
  • Clean gutters regularly to prevent clogs and water damage near the foundation.
  • Direct downspouts away from the foundation for proper water drainage.
  1. Moisture Barriers and Insulation:
  • Use moisture barriers in crawl spaces and basements to prevent seepage.
  • Insulate walls, floors, and attics to control temperature and minimize condensation.


How do I keep water out of my crawl space?

Install proper drainage systems and gutters to redirect water away from the foundation. Seal any cracks or openings in the crawl space walls or foundation. Use moisture barriers, such as vapor barriers, to prevent water seepage.

How long does it take for water to damage a foundation?

The timeline for water damage to a foundation can vary depending on several factors, including the amount of water exposure, soil composition, and the foundation’s construction. In general, water damage can occur gradually over time, and significant problems may develop within months or years if water issues are left unaddressed.

How can I improve ventilation in my crawl space or basement?

Install vents or fans to increase airflow in the crawl space or basement.
Ensure that any existing vents are not blocked or obstructed.
Consider installing a dehumidifier to control moisture levels.

Is it necessary to install a sump pump if I have moisture issues in my basement?

The necessity of a sump pump depends on the severity of the moisture issues in your basement. A sump pump can be an effective solution for preventing water accumulation and addressing drainage problems. Consulting with a professional who can assess your specific situation is recommended to determine if a sump pump is necessary for your basement.


In a nutshell, addressing improper drainage, inadequate ventilation, plumbing leaks, groundwater issues, insufficient insulation, and implementing solutions like grading, vapor barriers, ventilation systems, dehumidifiers, sump pumps, foundation repairs, insulation, waterproofing, sealing gaps, landscaping, and routine maintenance, will help eliminate excess moisture and prevent related problems.