What is a Crawl Space? Everything You Need to Know

Interior of a crawl space with dirt floor and wooden support beams.

Crawl spaces are a popular and common foundation type in the United States. According to the National Association of Home Builders, approximately 10% of all homes built in 2022 had one.

But why do people want a crawl space? What are the pros and cons of having one? We’ll answer that and more on this page.

Why Is it Called a Crawl Space?

Crawl spaces are small, raised areas found under a building. They get their name from their low height, generally less than 1 to 1.5 meters (3 ft. 3 in. to 4 ft. 11 in.). In such a small space, most people can only get around by crawling—and that’s why we call it a crawl space.

Some people confuse crawl spaces with basements, but they aren’t the same. Crawl spaces are built above the ground and are smaller in height, while basements are situated below ground and offer plenty of space to move around.

💡 Fun Fact:

Crawl spaces from the early 1900s typically relied on minimal support—just a few unevenly spaced bricks, stones, or wooden supports barely embedded in the ground. It’s no surprise that many of these old homes now face foundation problems!

What is the Purpose of a Crawl Space?

A crawl space plays several vital roles in a building, including:

Serving as the building’s foundation (supporting the building’s weight and structure).
Housing important utilities such as plumbing, electricity, and HVAC systems.
Protecting the building from potential flooding due to its raised design.

Since the crawl space keeps a building standing and is home to many of its essential functions, it’s important to keep the crawl space safe.

Types of Crawl Spaces

All crawl spaces serve the same basic functions and have a similar design. However, there are some differences depending on the specific type of home or building. These differences usually involve the owner’s personal preferences.

1. Actively Vented Crawl Spaces

These crawl spaces have vents and fans that actively circulate air in and out of the crawl space. In theory, this should keep moisture out—but crawl space vents typically cause more moisture issues than they prevent.

2. Passively Vented Crawl Spaces

These crawl spaces rely on natural airflow to manage moisture and air quality. Typically, these crawl spaces just have open vents. Unfortunately, this also leads to moisture problems, as the open vents actually allow humid air and other moisture to easily get below the building.

3. Encapsulated Crawl Spaces

Encapsulated crawl spaces (sometimes called conditioned crawl spaces) have comprehensive protection against all forms of moisture. Different waterproofing tools work together in this kind of crawl space, such as a vapor barrier, dehumidifier, and sump pump.

Encapsulating a crawl space is the leading and modern way to keep it safe. Learn more about crawl space encapsulation here.

Pros and Cons of a Crawl Space

Owning a crawl space or thinking about building a home with one comes with many considerations. Make sure to take this information into account:

Pros of a Crawl Space

Improved Air Circulation: Enhances home ventilation, which can reduce air conditioning costs.
Easier Access: Provides convenient access to plumbing, electrical systems, and ductwork, simplifying repairs and inspections.
Cost-Effective: Maintaining a crawl space is generally less expensive than other foundation types.
Moisture Control: Properly ventilated or encapsulated crawl spaces effectively manage moisture, preventing mold and wood rot.

Cons of a Crawl Space

Pest Attraction: If not properly maintained or sealed, they can attract pests.
Moisture Issues: Crawl spaces can become damp without proper water management, leading to mold growth and wood rot.
Temperature Fluctuations: Poorly insulated crawl spaces can impact the home’s temperature control, increasing energy bills.
Access Difficulties: Although they provide access to house systems, crawl spaces can be cramped and challenging to navigate.

How to Stop Crawl Space Moisture

Crawl spaces are highly susceptible to moisture due to being close to the ground and built with open vents and dirt floors. Here are expert tips to stop crawl space moisture:

Before (left) and after (right) crawl space encapsulation.

Install encapsulation: To control the moisture below your home, add a vapor barrier, crawl space drains, drainage matting, and other waterproofing tools.
Close vents: If your crawl space has open vents, consider sealing them from inside with encapsulation and outside with vent covers.
Regrade yard: Improper yard grading (the slope of a property) and poor landscaping can cause groundwater to drain toward the crawl space and flood it. Fix these if needed!
Provide regular maintenance: Make sure to check on your crawl space every few months and consider calling a professional for a more thorough inspection.

Protect Your Crawl Space With AquaGuard Foundation Solutions

AquaGuard inspector shaking hands with homeowner at front door.

Your crawl space is arguably the most important part of your home. For that reason, you need to make sure it’s protected against moisture and structural damage.

If you live in North Georgia and have a problem in your crawl space, contact us. We’ll come out, conduct a free inspection, and provide you with a repair estimate.

Schedule Free Inspection

Crawl Space FAQs

What is the best way to dry out my crawl space?

After removing any standing water, AquaGuard specialists implement the CrawlDrain™ perimeter drainage system, which efficiently captures water leaks and directs them to a sump pump. Additionally, we place drainage matting on the floor to guide water toward these systems. Vital steps also include crawl space encapsulation with a vapor barrier, insulation, and dehumidification. Reach out to AquaGuard Foundation Solutions for further details and to arrange a free crawl space inspection.

Will crawl space drainage installation impact my home’s foundation?

Our proprietary CrawlDrain™ system is meticulously crafted to safeguard and preserve your foundation by effectively managing water to prevent adverse effects. The installation involves minimal excavation and is easily monitored and maintained by professionals through routine inspections. Contact AquaGuard Foundation Solutions to learn more and schedule a free crawl space inspection.

Are there any downsides to sealing crawl space vents?

Only if the sealing is done poorly. If the process is done wrong, moisture will still get into the crawl space, build up over time, and have a harder time escaping.

Related Resources

The Problem with Open Crawl Space Vents

Think you should let your crawl space vents breathe in warmer weather? Think again! Learn why unsealed crawl space vents can cause major problems for your home.

Should I Remove Insulation From My Crawl Space?

Is insulation worth having in your crawl space? Get expert advice on this page!

5 Ways Humidity Damages Your Crawl Space

Living in Georgia means humidity is a part of life. Here's what happens if you don't take any steps to protect your home from it!

Ted Dryce

Content Writer

Ted is an SEO Content Writer who has been with Groundworks since 2021. He’s covered home repair topics ranging from crawl space encapsulation to regional soil conditions. When he’s not working, Ted is performing improv comedy and working on his own creative projects.