Does Spray Foam Insulation Work in Crawl Spaces?

spray foam crawlspace insulation

Insulating the crawl space is one of the most effective ways to maintain a warm and cozy indoor environment. However, if the insulation is not installed correctly, it can lead to significant issues. Anything from soggy insulation to rodent infestations may occur, depending on the condition of the insulation.

When it comes to crawl space insulation, there are numerous options available, such as fiberglass batts, cellulose insulation, spray foam insulation, and more.

The question often arises: What is the most essential factor in ensuring that insulation lasts the longest, especially in crawl spaces?

Crawlspaces are prone to dampness, air leakage, rodents, and similar issues. Therefore, it is crucial to install high-quality insulation that can withstand these challenges and endure over time.

Today, we will explore how spray foam insulation can be most effectively utilized in the crawl space. Without further ado, let’s delve in and learn more.

What is a Crawl Space Insulation? 

The crawlspace is an empty area beneath a house upon which the foundation rests. Usually, it is a hollow space that can be around 30cm to 90cm high.

Depending on the house’s construction, it may contain ductwork, wiring, or plumbing networks. It is crucial to insulate the crawl space to protect your home from cold air entering.

Proper crawl space insulation helps keep your home safe from freezing temperatures. It can also protect ductwork, wiring, plumbing pipes, and other such components from damage caused by temperature changes.

Also Read: Does Soundproofing Insulation Work?

Why Use Spray Foam Insulation for Crawl Space? 

When insulating your crawl space, it’s important to ensure it is done correctly. This involves sealing the joints, preventing water from entering, reducing the chances of moisture buildup, preventing rodent infestation, and sealing hatchways.

The best insulation type that meets all these requirements is spray foam insulation, especially closed-cell foam insulation. It provides both thermal and moisture protection.

Due to its chemical composition, it expands and fills the cracks and gaps, permanently sealing them shut. With all holes and cracks sealed off, there’s a significantly lower chance of pests entering your space.

While other insulation types are edible, this type prevents rodents from eating their way in. It prevents creating a hospitable environment. It’s also a great soundproofing insulation type for your home, workplace, or any other property you own. 

Steps to Installing Spray Foam Within the Crawlspace 

Spray foam insulation is a complex process and may require advanced application techniques & professional expertise. It also requires a high-quality insulation spray gun and proper protective gear, which can be costly when purchased individually.

1. Clean the Crawlspace

Remove any debris, dirt, or existing insulation from the crawlspace. A clean surface ensures better adhesion of the spray foam.

2. Identify and Seal Gaps

Using a suitable sealant, identify and seal any gaps, cracks, or openings in the crawlspace walls and foundation. This will prevent air leakage.

3. Choose the Right Type of Spray Foam

There are two main types of spray foam insulation: open-cell and closed-cell. Closed-cell foam provides a higher R-value and acts as a moisture barrier, but it is more expensive. Choose the type that best suits your needs.

4. Install a Vapor Barrier (if needed)

Depending on your climate and local building codes, you may need to install a vapor barrier on the crawlspace floor to prevent moisture issues. If required, lay down a plastic sheet and secure it to the walls.

5. Begin Spraying

Start applying the spray foam insulation on the walls, starting from the bottom and working your way up. Use a steady and even motion to ensure consistent coverage. Hold the spray nozzle about 12 to 18 inches away from the surface.

6. Fill Cavities and Gaps

Pay special attention to filling cavities, gaps, and voids in the crawlspace walls. This will help create a complete air seal.

7. Allow Proper Drying Time

Follow the manufacturer’s instructions for drying time. It’s essential to allow the spray foam to cure properly before moving on to the next steps.

Safety Precautions

During the installation process, it is must to wear appropriate safety gear, including gloves, goggles, and a mask to protect against fumes. Ensure proper ventilation in the crawlspace by using fans or open vents.


At Foam Master USA, our professionally certified team carries all the necessary equipment & the expertise required to perform spray foam insulation.

We can apply spray foam insulation within your crawlspace at the best affordable price. Need crawl space insulation? Dial 718-865-9647.



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Is Spray Foam Worth the Cost?

EPA indicates that energy bills can be cut down by 20% when air leakage is considerably minimized with insulation. Are you still wondering if it’s worth the cost? You shouldn’t. Call our spray foam insulation service in NYC to deliver the best spray foam service in town.
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