Fast, Reliable Crawl Space Encapsulation & Vapor Barrier Across Marietta
Crawl space encapsulation in Marietta typically runs $8,000-$15,000 for a full system on a standard ranch home, with vapor barriers alone starting around $3,500-$5,500. Most jobs are completed in one or two days, and our crews serving Marietta work with the specific housing stock this city has: thousands of Lockheed-era ranches with vented crawl spaces that were never designed for Georgia’s humidity. If you’re dealing with damp floors, musty air, or insulation that’s fallen onto the dirt, call us at (218) 261-7714. We’ll give you a written price before any work starts.
Why Topside Attic Insulation Is Marietta’s Preferred Crawl Space Encapsulation & Vapor Barrier Company
We’ve done over 9,000 homes since 2016, and a significant share of those are in Marietta’s mid-century neighborhoods east of the Square and around Dobbins Air Reserve Base. That matters because these homes share a construction fingerprint. When a crew opens the crawl hatch on a 1960s ranch off Lower Roswell Road, we already know what we’ll find: vents pulling humid air in, fiberglass batts sagging off the joists, and rim joists with no insulation at all. We pre-scope the encapsulation work before we even pull the ladder out.
Every job starts with a written price and a written scope. That’s Haven Standard Clause 1, and it’s been the rule since Wes Okafor founded this company. Marietta homeowners read the three-star reviews as closely as the five-star ones, and we understand why. You want documentation, not promises. On every job, you get a Documented Photo Record showing what we found, what we did, and what it looked like when we left. On encapsulation work, you also get before-and-after humidity readings where applicable.
Our crews serve Marietta daily. Calls are answered by a live person, 24/7, not a voicemail loop. If you text, we’ll text back. If you want a second opinion on a competitor’s written estimate, bring it to us and we’ll read it with you, line by line, at no charge.
Take a look at our full Crawl Space Encapsulation & Vapor Barrier service page for the broader scope of what we do across metro Atlanta.
Our Crawl Space Encapsulation & Vapor Barrier Services in Marietta
Crawl Space Vapor Barrier
A vapor barrier in a Marietta crawl space is not optional once the old fiberglass has failed. We install 12-mil reinforced poly sheeting that runs up the foundation piers and is sealed at every seam with butyl tape and PVC tape. In Marietta’s clay-heavy soil, ground moisture wicks upward constantly. A properly installed barrier cuts that off at the source.
Crawl Space Encapsulation
Full encapsulation means sealing the vents, insulating the rim joists and foundation walls with closed-cell spray foam, and installing a reinforced vapor barrier across the floor. In a Lockheed-era ranch, this is the difference between a crawl space that breathes Georgia humidity all summer and one that stays in the low 50s on relative humidity. We don’t encapsulate over degraded batts. We remove them first.
Crawl Space Insulation
In Marietta’s mixed-humid climate, fiberglass batts between floor joists are a losing strategy. They absorb ground moisture, sag, and lose R-value within 3-5 years. We use closed-cell spray foam on rim joists and foundation walls, sourced from manufacturers like Demilec and Icynene. This creates an air seal and a thermal break in one step, which is what a vented crawl space actually needs.
Crawl Space Moisture Control
Moisture control in Marietta starts with air sealing. If the vents are open, July humidity is pouring in no matter how many dehumidifiers you run. We seal the vents, install the vapor barrier, and when needed, add a crawl space dehumidifier sized for the square footage. Our crews then document the before-and-after humidity readings so you can see the change in numbers.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Marietta
We install materials from Knauf, CertainTeed, and Icynene, among others. There’s no proprietary product lock-in here. Wes Okafor’s approach is simple: pick the material that matches the house and the budget, write it into the scope, and stick to it. For Marietta’s older ranch stock, we typically specify closed-cell spray foam for rim joists and foundation walls and a 12-mil reinforced poly barrier for the floor. The materials are ordered per job, so there’s no warehouse delay and no substitution game.
Common Crawl Space Encapsulation & Vapor Barrier Problems We See in Marietta Homes
- Sagging fiberglass batts on the dirt. In the ranch neighborhoods east of Marietta Square and around Dobbins, builders routinely laid batts on the crawl space ground instead of between the joists. Within a few Georgia summers, they’re soaked, compressed, and useless. We remove them before anything else.
- Vented crawl spaces pulling in July humidity. Marietta sits in IECC Climate Zone 3A, mixed-humid. That means open crawl space vents bring in 80% relative humidity air all summer. Hardwood floors cup, doors stick, and the smell rises into the living space. Encapsulation breaks that cycle.
- Rim joists with zero insulation. In homes built before Georgia energy codes had teeth, the rim joist cavity between the floor framing is often completely open. That’s a year-round thermal bypass. In the winter, the first floor feels drafty even when the thermostat is set high. Closed-cell spray foam fixes it permanently.
- Dehumidifiers running constantly without solving the problem. If the crawl space is vented, a dehumidifier is fighting a losing battle. It’s pulling moisture out of the air while the vents are pulling humid air back in. Sealing first, then dehumidifying, is the only sequence that works in Marietta’s climate.
Pricing for Crawl Space Encapsulation & Vapor Barrier in Marietta, GA
Here are real numbers for Marietta’s market, based on the homes we see most often: 1,200-1,600 sq ft Lockheed-era ranches with vented crawl spaces.
- Vapor barrier only (12-mil reinforced, installed up piers and sealed): $3,500-$5,500
- Full encapsulation (seal vents, rim joist and foundation wall spray foam, vapor barrier): $8,000-$15,000
- Encapsulation plus crawl space dehumidifier: $11,000-$18,500 depending on crawl space size and access
- Failed insulation removal and disposal: $900-$1,800 depending on square footage and how much debris is down there
What moves the number: crawl space height and access, whether there’s standing water or rodent damage, and whether the foundation walls need full coverage spray foam or just rim joists. We give you one flat price in writing before any work starts. No hourly billing, no “it depends” after the crew arrives. Call (218) 261-7714 and we’ll schedule a walkthrough at your Marietta home, then send the written price.
We Also Serve Cities Near Marietta
Our crews work across northwest metro Atlanta. We regularly handle crawl space encapsulation in Marietta, plus Smyrna, Roswell, Alpharetta, and Atlanta proper. If you’re in one of those cities and dealing with a vented crawl space or failed floor insulation, the same written-price rule applies. Call or text and we’ll get a crew scheduled.
Serving Marietta, GA - Our Local Coverage Area
We’re based in the Marietta area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - Crawl Space Encapsulation & Vapor Barrier in Marietta
Because builders in the late 1940s through the 1970s were putting up homes fast for plant workers, and crawl space insulation was treated as an afterthought. Batts were often laid on the ground instead of being secured between the floor joists, and within a few years they absorbed enough ground moisture to fall. In the Lockheed-era neighborhoods east of the Square and around Dobbins, this is so common that our crews recognize the pattern before they even enter the crawl space. Call (218) 261-7714 if you want to know what’s under your floors.
Adding more fiberglass is repeating the original mistake. In Marietta’s mixed-humid climate, fiberglass in a vented crawl space absorbs moisture and loses R-value within a few years. The fix that actually holds is encapsulation: seal the vents, insulate the rim joists and foundation walls with closed-cell spray foam, and install a sealed vapor barrier. That converts the crawl space from a humid, vented box into a conditioned space. If you’re weighing the cost, get a written price from us and compare it against what you’d pay for batts plus dehumidifiers that never quite solve the problem.
Yes. The musty smell is coming from moisture, and moisture in a vented crawl space comes from two sources: ground evaporation and humid outdoor air pulled in through the vents. Encapsulation cuts both. Once the vents are sealed and the vapor barrier is down, the relative humidity in the crawl space drops into the 50s or lower, and the smell stops migrating into the living space. We document the before-and-after humidity readings so you can see the change in numbers, not just smell it.
A properly installed 12-mil reinforced vapor barrier in a Marietta crawl space will last 20-25 years or longer. The key is installation: the poly needs to run up the foundation piers, every seam needs to be taped with butyl and PVC tape, and it needs to be mechanically fastened so it doesn’t shift. Heavy clay soil and a high water table make ground moisture constant, which means a thinner 6-mil barrier will tear and fail much sooner. We don’t install 6-mil in Marietta. It’s a false economy.
You need both. A vapor barrier stops ground moisture, but it doesn’t stop heat transfer through the foundation walls and rim joists. In Marietta, where winter cold snaps drop into the teens and summer heat bakes the ground, an encapsulated but uninsulated crawl space will still make the first floor feel cold in January and warm in August. We insulate the rim joists and foundation walls with closed-cell spray foam. That’s the difference between a crawl space that’s merely dry and one that’s actually part of the conditioned envelope of the home.
Written by Wes Okafor, Owner at Topside Attic Insulation, serving Marietta since 2016.