Sub-Slab vs. Crawlspace Radon Systems: Which One Is Best for You?

May 17, 2025      

Radon gas is invisible, odorless — and potentially dangerous. If you’ve tested your home and discovered elevated radon levels, the next step is to install the right mitigation system. But not all systems are created equal. The design of your home’s foundation plays a big role in determining the best approach.

At The Radon Guys, we specialize in custom radon mitigation solutions designed to fit your home’s unique layout. In this post, we’ll compare sub-slab depressurization systems and crawlspace radon systems, so you can better understand which method is right for your space.

Sub-Slab Depressurization: A Basement & Slab Favorite

Ideal For: Homes with full basements or slab-on-grade foundations

How It Works:

This system involves drilling a small access point through your concrete slab to reach the soil beneath. A fan and vent system is then installed to pull radon gas from below the slab and redirect it safely above your roofline, away from living areas.

Key Benefits:

• Proven effective and widely used
• Works continuously with little maintenance
• Can often be installed with minimal visual impact

Choose This If You Have:

• A basement or concrete slab foundation
• Elevated radon test results
• No exposed soil under the home

Crawlspace Mitigation: For Homes with Exposed Earth

Ideal For: Homes built with crawlspaces, especially those with dirt floors

How It Works:

Crawlspaces can allow radon to enter through the soil. To control this, we cover the floor with a durable vapor barrier, then install a venting system that draws radon from under the barrier and vents it outside.

Key Benefits:

• Seals soil to reduce radon entry points
• Helps with humidity and moisture control
• Customizable for different crawlspace types

Choose This If You Have:

• A vented or unvented crawlspace
• Unsealed dirt or gravel floors
• Higher radon levels in rooms above the crawlspace

Why Homeowners Trust The Radon Guys

• Certified radon professionals
• Custom systems built for your foundation
• Prompt, clean installations
• Competitive pricing with no hidden fees
• Local experience you can count on

Let’s Fix Your Radon Problem — The Right Way

Whether your home has a basement, crawlspace, or something in between, The Radon Guys have the tools and expertise to protect your indoor air quality.

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