Crawl Space Radon in Marietta
Sub-Membrane Depressurization for Cobb County Homes
Many Marietta homes have crawl space foundations. We seal and depressurize your crawl space to stop radon entry and control moisture.
Crawl Space Radon Challenges
Crawl spaces present unique challenges for radon control in Cobb County homes.
Exposed Soil
Dirt-floor crawl spaces allow radon to enter directly from the soil without any barrier.
Venting Issues
Traditional vented crawl spaces don't effectively prevent radon from entering living spaces above.
Moisture Problems
Cobb County's humid climate creates moisture issues that often coincide with radon entry.
Stack Effect
Warm air rising in your home pulls crawl space air (and radon) upward into living areas.
Sub-Membrane Installation Process
Preparation
Clear debris and level the crawl space floor for proper membrane installation.
Membrane Install
Heavy-duty polyethylene sheeting is laid over the entire floor and sealed to walls.
Suction Point
A suction pit is created beneath the membrane and connected to PVC piping.
Fan & Venting
A radon fan draws air from beneath the membrane and vents it above the roofline.
Moisture Control Bonus
Crawl space encapsulation addresses both radon and moisture issues common in Cobb County. The sealed membrane prevents ground moisture from entering, reducing humidity and protecting your home's structure and air quality. If moisture control is your primary goal, our sister company Erase Mold also offers dedicated crawl space encapsulation.
Crawl Space Radon FAQs
How does crawl space radon mitigation work?
Sub-membrane depressurization involves sealing a heavy plastic membrane over the crawl space floor and walls. A fan creates negative pressure beneath the membrane, drawing radon out before it can enter your home.
Will this help with moisture too?
Yes. Crawl space encapsulation with a sealed membrane helps control moisture, reduces humidity, and can prevent mold growth, all while addressing radon. It's a dual-benefit solution common in Cobb County homes.
Do vented crawl spaces need radon mitigation?
Venting alone doesn't prevent radon from entering your home. The stack effect pulls crawl space air upward regardless of vents. Active depressurization is typically more effective than passive ventilation.
How much does crawl space radon mitigation cost in Marietta?
Crawl space systems in Marietta typically cost $1,000-$2,200, depending on crawl space size, accessibility, and whether the space needs preparation work before membrane installation.
Can I access my crawl space after mitigation?
Yes. The membrane is durable enough to crawl on for inspections and maintenance. We maintain access points and ensure the system doesn't block necessary access to utilities.
How long does crawl space installation take?
Most crawl space systems are installed in one day. Larger crawl spaces or those requiring significant preparation may take longer.
Seal Your Crawl Space
Contact us to discuss crawl space radon mitigation for your Marietta home.
Related Topics
Radon Testing
Test crawl space and living areas
Mitigation Systems
Compare sub-membrane vs other systems
Mitigation Cost
Crawl space systems $1,000-$2,200
Basement Radon
For combination foundations
Slab Foundation
Sub-slab systems for concrete slabs
Radon Safety Resources
Expert insights and guides to keep you informed
Radon Still High After Mitigation? Here Is Why, and What to Do
Your radon system is running but levels are still at or above 4.0 pCi/L. Here are the common reasons a mitigation system underperforms, what you can check yourself, and when to call a professional for diagnosis and a fix.
Read more about Radon Still High After Mitigation? Here Is Why, and What to Do →
Radon in Slab-on-Grade Homes: Why No Basement Does Not Mean No Radon
Slab-on-grade homes have no basement, which leads many metro Atlanta homeowners to assume they are safe from radon. They are not. Radon enters through slab cracks, control joints, and plumbing and utility penetrations directly into the living space. How radon gets into a slab home, why these homes still test high, how testing works, and how sub-slab depressurization mitigates a slab home.
Read more about Radon in Slab-on-Grade Homes: Why No Basement Does Not Mean No Radon →
Do Consumer Radon Monitors Work? Electronic Monitors vs Lab Test Kits
Consumer electronic radon monitors are great for ongoing awareness and trends, while lab-analyzed charcoal and alpha-track kits and professional tests are the standard for decisions like real estate. How accuracy, cost, and speed compare, and which to use when.
Read more about Do Consumer Radon Monitors Work? Electronic Monitors vs Lab Test Kits →