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DIY Crawl Space Encapsulation

DIY Crawl Space Encapsulation

Maintenance and insulation of crawl spaces are essential for each home. So homeowners can easily see what is present in their crawl spaces. Though these are narrow spaces, you can check whether they need maintenance. When you feel some sticky smell from the floor, then it is time when you need to focus on crawl space encapsulation. 

A crawl space is a dangerous place because it has many harmful small creatures and mold. When your crawl space is moist, it can minimize the efficiency of HVAC. So, that’s the time when you need to go for DIY encapsulation. However, it is a challenging process, so you need to get help from an expert. 

This article will help you to know how to encapsulate crawl spaces. So, keep reading this article till the end for moisture-free crawl spaces. 

Brief Guide about DIY Crawl Space Encapsulation

Encapsulation means the sealing of a dirty floor in the space through the help of a vapor barrier. Not only this, but you can also install a dehumidifier and insulate the crawl space wall. Besides, encapsulation also means the sealing of all ventilation sides. This way, moist air can’t enter the crawl spaces. Before encapsulation, you need to focus on the following things:

Examine Your Property

Before the encapsulation process, you need to inspect the space deeply. It is good if your home’s floor is the plan and you have the best inspection method. The next step is to make sure that the home is appropriately graded. Suppose you are worried because your drainage system has a problem. Then it is good to call an expert to solve this problem. 

Besides, you also need to check the mold growth in the space. After inspection, remove the mold from the space so it will not block encapsulation. Not only this, but also check the gas leaks and water heater. Lastly, check the humidity level. 

Repair the Crawl Spaces

Once you examine the crawl space and know the damage of it, then it is time to repair some structural elements of the crawl space. It commonly includes the removal and replacement of rotten wood. In the case of rotten wood, you also have the option to replace it.

Ensure to use the right support when you remove the structural elements supporting the space. Clean all the dirt and waste so you can start the work.

Seat the Outdoor Spaces and Vent with Vapor Barrier 

After you have done everything, the next step is sealing off the vents and the gaps. For this, you have the option to use covers, sealed doors, and hydraulic cement.

Another better option is using a foam board to insulate the crawl space. For this, you also have the option to use fiberglass. 

Remove All Excessive Moisture Barriers and Install New 

Now, it is the time when you need to remove the vapor barrier to make space for the new. Ensure to level the space after removing the barrier. So, it will help you to install the new one easily. Installation of a new barrier can minimize the entry of moisture into the crawl spaces. It is because moisture can cause bad odor on your floor. 

To begin, prioritize safety by wearing protective gear like dust mask, gloves, and safety goggles, and ensure proper ventilation while turning off any utilities like gas or electricity in the crawl space. Start by clearing the crawl space of items and debris, and then carefully remove and dispose of the existing moisture barriers, taking care not to damage structural components. Inspect the crawl space for any damage or moisture-related issues and address them before proceeding. 

Next, clean the crawl space floor and walls to create a clean surface. Measure the crawl space dimensions and cut an appropriate moisture barrier material like plastic or vapor barrier sheets to size. Lay the moisture barrier on the floor, extending it up the walls and sealing seams with waterproof tape or adhesive. Secure the barrier along walls and vertical surfaces, trim any excess material, and insulate or seal crawl space vents. 

Finally, reconnect any utilities and regularly inspect the crawl space for moisture or damage, addressing issues promptly to maintain a dry and healthy environment. If you’re unsure about any aspect, consider consulting a professional contractor experienced in crawl space encapsulation and moisture control.

Dry Out the Crawl Spaces 

It is the point where you have almost done encapsulation. But before going into the crawl space, you need to dry it. So, the better option for its dryness is the installation of a dehumidifier. 

These are the best options to minimize the moisture level in the crawl space all year. Another option is the use of a humidity monitor. This way, you can know the humidity level of the crawl space and check the efficiency of encapsulation. 

Always Perform Regular Inspections 

Once you dry out the crawl space, the next step is the successful encapsulation of it. After that, you should inspect your crawl space regularly. This way, you will know the moisture level and check whether your dehumidifier is working. 

DIY VS Professional Crawl Space Encapsulation

Crawl spaces are narrow and filled with many rodents, pests, dirt, molds, and moisture. So, if you are really worried about the cleaning of crawl spaces, then it is the best time to seek help from a professional. Always choose a company that is trained and experienced in making crawl spaces clean. The experts can encapsulate crawl spaces professionally as compared to DIY encapsulation. 

An expert inspects the crawl space and provides you with a detailed report. This report contains recommendations for unwanted repairs. 

What is the disadvantage of encapsulating a crawl space?

Many people want to know the cons of crawl space encapsulation. The only con is the initial cost of installation and the continuous maintenance of the space to keep it in the proper condition. 

What material do they use to encapsulate the crawl space?

The best material used for encapsulation is the use of polyethylene barrier with polyester cord. There are many sizes and thicknesses of this material available. If you install it properly, it can protect your home from moisture, dirt, and external air. 

Is it okay to seal off a crawl space?

Yes, it is good to seal off the crawl space. You can seal all spaces to protect them from air and moisture. 


Nothing is difficult when you go for the DIY crawl space encapsulation. It is a very easy but time-consuming and hardworking process. So, it is better to get help from the expert during encapsulation. Besides, before encapsulation of crawl spaces, you must have the right tools and equipment. 

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