Skip to content



17Apr 2023
Expert Tips for Efficient Basement Crawl Space Encapsulation
Expert Tips for Efficient Basement Crawl Space Encapsulation

The crawl space is essential in the home for housing the irrigation, gas lines, plumbing, electrical, and HVAC system. Homes with crawl spaces open to outside elements frequently have moisture-related problems, including mold and fungus development. To prevent these problems, a basement crawl space encapsulation is recommended.

What Is Crawl Space Encapsulation?

What Is Crawl Space Encapsulation

Crawl space encapsulation is the process of sealing spaces around the home to avoid indoor moisture problems. This solution can be likened to lining the swimming pool to prevent leaks.

A heavy-duty polyethylene water vapor layer is installed to cover the flooring, foundation walls, and occasionally even the ceiling to make the crawl. This will help make the space as efficient as possible. The barrier sections are joined together using specialized sealing tape all over the area.

Reasons For Crawl Space Encapsulation

Reasons For Crawl Space Encapsulation

There is a need for crawl space encapsulation due to many reasons. Here are some of the reasons why crawl space encapsulation can be beneficial:

  • Moisture control: Crawl space encapsulation can help control moisture levels in the crawl space, preventing mold and mildew buildup. This can improve indoor air quality and reduce the risk of respiratory problems for those living in the home.
  • Energy efficiency: Sealing and insulating the crawl space can also improve energy efficiency by reducing drafts and heat loss. This can result in lower energy bills and a more comfortable living space.
  • Structural integrity: A sealed and insulated crawl space can also help protect the home's structural integrity by preventing moisture-related damage, such as rot and decay, to floor joists and subflooring.
  • Pest Control: Sealing the crawl space can also help to prevent pests such as rodents, insects, and snakes from entering the home through the crawl space.
  • Improved home value: Crawl space encapsulation can improve the home's overall value by providing added protection, energy efficiency, and comfort to those living in the home. If the homeowner decides to sell, it can also make the home more appealing to potential buyers.

Expert Tips for Efficient Basement Crawl Space Encapsulation

Sealing and insulating the crawl space can help control moisture levels and prevent the growth of mold and mildew. It can also reduce drafts and heat loss, improving the home's overall comfort.

Below are expert tips for efficient basement crawl space encapsulation.

1. Clean and seal

Before you begin the crawl space encapsulation, you must clean the basement and ensure no mold or other harmful elements are present. Seal or replace the open seals that are between floor tiles as required.

Also, call a professional to help seal any cracks in your foundation before you start the encapsulation. Make sure your crawl space door frame fits snugly, and fill in any gaps or cracks.

2. Check your drainage system

A properly installed drainage system is essential to the effectiveness of crawl space encapsulation. Your foundation is under hydrostatic pressure if water is dripping through the walls of your foundation. Water drainage installation is a crucial component of the suggested repair.

Walls will break or bow if hydrostatic pressure is not controlled. These seriously jeopardize the structural integrity of your home. If left inclined, the divide can collapse.

3. Create proper airflow

Proper airflow is crucial for efficient basement crawl space encapsulation. The crawl space should have an adequate supply of fresh air to prevent moisture buildup and mold growth. A vented crawl space should have vents installed on opposite walls to promote cross-ventilation.

However, a sealed crawl space with a dehumidifier in humid climates may be a better option. The crawl space should also have proper insulation and a vapor barrier to prevent moisture intrusion.

4. Select the right insulation

The popular insulation material for crawl space encapsulation is fiberglass but spray foam is another non-water-sensitive insulation. Without proper ventilation, mildew and mold can grow, holes and gaps can form, and the fiberglass insulation can absorb moisture and water.

Spray foam insulation is non-retentive insulation that is safe for the environment and does not retain water. In addition to reducing your energy bills in the long run, installing insulation will help to keep your home warm.

5. Remove old moisture barriers

Before putting in a new moisture barrier, removing the old one when encapsulating a basement crawl space is crucial. The last barrier may have been ripped, torn, or improperly installed, which could cause moisture to accumulate and mold to grow. The removal procedure includes;

  • carefully cleaning the floor and walls with a detergent solution,removing any vapor barriers that may have been in place, and giving the area time to dry.

6. Install new moisture barriers

Starting with the piers, wrap the new vapor barrier. Avoid damaging cables, wiring, or pipes by cutting carefully around obstructions.

Tape the vapor barrier with waterproof material to ensure a tight fit. The crawlspace region should be wrapped entirely in poly. Tuck the corners to lie level and extend a few inches past the seams.

7. Dehumidify the crawl space

A high humidity level in the crawl space can lead to mold growth, musty odors, and structural damage to the home. Installing a dehumidifier can help to maintain a relative humidity level of 50% or lower, which is ideal for preventing mold growth and promoting good indoor air quality.

A dehumidifier should be appropriately sized for the crawl space, and a drain line should be installed to remove the collected water. Dehumidifying the crawl space and encapsulation can improve the overall comfort and health of the home, making it a worthwhile investment.


To control moisture levels, avoid mold development and structural damage, and enhance indoor air quality, efficient basement crawl space encapsulation calls for optimum circulation, removing outdated moisture barriers, and dehumidification. Following the expert tips discussed and consulting with a professional is recommended to ensure proper installation and sizing of materials and equipment.