North Fulton County, Georgia
Crawl space encapsulation in Alpharetta typically costs between $4,500 and $11,000. Reliable Solutions Atlanta replaces failing builder-grade vapor barriers with complete encapsulation systems that eliminate moisture, mold, and energy waste in North Fulton homes. Free same-week inspections with written estimates.
Alpharetta homes built during the North Fulton building boom of the 1990s and 2000s used the vented crawl space design mandated by building codes at the time. Builders installed 6-mil polyethylene vapor barriers on the crawl space floor and punched foundation vents into the walls. This was considered adequate protection. Two decades of building science have proven it is not — especially in metro Atlanta's humid subtropical climate.
The 6-mil barriers installed in Alpharetta subdivisions like Windward, Broadwell Oaks, Thornberry, Cambridge, and Cogburn Station have not held up. They were laid loosely on dirt floors, not sealed at seams or fastened to walls. Over 15 to 25 years, they have torn during HVAC service calls, shifted from water flow, been chewed by rodents, and degraded from UV exposure through open vents. In most Alpharetta crawl spaces we inspect, the original barrier covers less than 50% of the floor area.
The open foundation vents compound the problem. Metro Atlanta summer dew points routinely exceed 70°F. When this hot humid air enters the cooler crawl space through vents, the moisture condenses on ductwork, pipes, and floor joists. This condensation cycle runs from May through September, depositing moisture on your home's structural wood for five months every year. After 20 years of this, the wood shows damage.
The 30004, 30005, 30009, and 30022 zip codes all have high concentrations of homes with failing builder-grade crawl space systems that are ready for encapsulation.
If you look in your Alpharetta crawl space access and see the plastic barrier bunched up, torn, or only partially covering the dirt floor, it is no longer providing meaningful moisture protection. The exposed dirt is evaporating moisture directly into the crawl space.
Water droplets on the exterior of your air conditioning ducts in the crawl space mean the crawl space humidity exceeds the dew point. This water drips onto structure and insulation, and the ducts themselves lose efficiency when wet.
The batts of fiberglass insulation installed between floor joists in Alpharetta crawl spaces absorb moisture, become heavy, and sag away from the subfloor. Fallen insulation is a visual indicator that the crawl space humidity has been too high for an extended period.
If your Alpharetta energy bills are higher than neighbors with similar homes, an unsealed crawl space may be the reason. Humid crawl space air forces your HVAC to work harder, and cold winter air entering through vents makes floors cold and heating less efficient.
If your annual termite inspector notes moisture, mold, or wood damage in the crawl space, these are signs that the environment needs to be controlled. Pest companies increasingly recommend encapsulation because it eliminates the conditions pests need.
Mold spores, dust mites, and other allergens thrive in damp crawl spaces and migrate into living areas. If family members experience more allergies or respiratory symptoms at home than elsewhere, crawl space moisture may be contributing.
We remove the existing torn builder-grade barrier, all fallen insulation, and any debris accumulated over the years. The crawl space floor is leveled and any standing water is addressed with drainage before encapsulation begins. If mold is present on the wood structure, we treat it with antimicrobial solution and allow it to dry before installing the new liner.
The 20-mil reinforced liner covers the entire floor and extends up all foundation walls to within 3 inches of the mudsill. All seams are overlapped 12 inches and sealed with seam tape rated for permanent adhesion. The liner is mechanically fastened to walls with termination strips and sealed at every pier, column, and pipe penetration. No exposed dirt remains.
Foundation vents are sealed with rigid foam board cut to fit each opening and sealed at the edges with foam sealant. Foundation walls are insulated with 2-inch closed-cell foam board that provides R-10 insulation and serves as an additional vapor barrier. Rim joists are sealed with spray foam to prevent air infiltration at the most vulnerable point in the building envelope.
We install a commercial-grade crawl space dehumidifier that maintains target humidity of 45-50% year-round. The unit has built-in monitoring that displays current humidity and temperature. It drains automatically to a condensate pump or existing drain line. For Alpharetta homeowners who want remote monitoring, we can install units with WiFi connectivity that send alerts to your phone.
| Service | Typical Cost |
|---|---|
| Vapor barrier upgrade (20-mil floor only) | $2,500 – $4,500 |
| Full encapsulation (liner + vents + insulation) | $4,500 – $11,000 |
| Partial crawl space encapsulation (slab/crawl combo) | $3,000 – $7,000 |
| Commercial dehumidifier with monitoring | $1,000 – $2,200 |
| Mold treatment | $1,500 – $3,000 |
| Old insulation removal and disposal | $500 – $1,500 |
Financing available through GreenSky. Transferable warranty included.
Crawl space encapsulation in Alpharetta typically costs between $4,500 and $11,000. Many Alpharetta homes have smaller crawl space sections combined with slab areas, which can reduce the total scope compared to full crawl space homes. Basic vapor barrier upgrade starts around $2,500. Full encapsulation with dehumidifier runs $7,000 to $14,000 for larger homes.
Yes. Homes built in the 1990s and 2000s in Alpharetta with crawl space sections typically have 6-mil builder-grade vapor barriers that have deteriorated, torn, or displaced over 15 to 25 years. The vented crawl space design used during this era has been proven ineffective in humid climates. Even relatively new homes benefit from full encapsulation.
Yes. Many Alpharetta homes built on sloped lots have a slab foundation on one end and a crawl space on the other where the grade drops. We encapsulate just the crawl space section, sealing it from the slab transition point. This is common in Windward, Cambridge, and other North Fulton subdivisions built on rolling terrain.
No. We work with your pest control company to ensure the encapsulation system is compatible with their treatment and inspection requirements. We leave termite inspection ports accessible and use liner that does not interfere with termite monitoring stations. Most pest companies prefer encapsulated crawl spaces because the dry environment discourages termite activity.
Most Alpharetta homeowners notice a difference within the first week. The musty smell reduces immediately as the dehumidifier lowers humidity. Within 2 to 4 weeks, indoor humidity stabilizes at a lower level and the HVAC runs less frequently. Energy bill reductions are typically visible in the first full billing cycle after encapsulation.
Home / Crawl Space Encapsulation / Alpharetta
Crawl space encapsulation also available in Lawrenceville, Marietta, Roswell, Decatur, Sandy Springs, and Stone Mountain.
We will inspect your Alpharetta crawl space, document the condition of the existing barrier and structure with photos, and give you a clear plan with pricing. No obligation.
BBB A+ Accredited · IICRC Certified · 20+ Years Experience · Financing Available
