Crawl Space Vapor Barrier Installation in Metro Atlanta
A crawl space vapor barrier is a sheet material laid over the crawl space soil to stop water vapor from evaporating out of the ground into the crawl space air, and a Class 1 vapor retarder is one with a permeance of 0.1 perm or less.
- Typical range
- $1,400 – $5,200
- Unit pricing
- $1.2–$3.5 per square foot installed
- Time on site
- 1 to 2 days on site
- Permit
- Not required
How vapor barrier is done
- 1Clear debris, sharp rock and construction leftovers that would puncture the sheet
- 2Rough grade the soil so the barrier lies flat without bridging voids
- 3Lay the sheet with a minimum 12-inch overlap at all seams
- 4Seal seams with a butyl or acrylic vapor barrier tape rated for the material
- 5Run the barrier up the foundation wall and mechanically fasten it with a termination bar or fasteners and sealant
- 6Detail around every pier with a wrapped and taped collar
- 7Leave a documented termite inspection gap at the top of the wall where the local pest standard requires it
When vapor barrier is the wrong purchase
A vapor barrier is the right purchase when ground moisture is the problem. If humid outside air entering through open vents is the driver, a barrier alone will not get you below 60 percent relative humidity.
Transparent pricing, published first
Every service page shows line-item ranges and the local factors that move them, before you call. If a quote you receive falls outside them, you have something concrete to ask about.
A written scope before any work starts
Written scope and price before any work starts. Quotes are honored for 30 days.
Response time we hold ourselves to
A crawl space specialist calls back within 60 minutes during posted hours, and by 9:00 AM the next morning for after-hours calls.
Licensing you can verify yourself
Georgia requires contractor licensing above $2,500 in project value. Ask for the number, then check it against the state register yourself. Georgia Secretary of State licence lookup
Signs you need vapor barrier
- Bare dirt visible anywhere on the crawl space floor
- Existing plastic that is torn, displaced or not sealed to the walls
- Damp soil that darkens visibly when you press it
- Condensation on the underside of the subfloor in summer
- A pest control or home inspection report calling out an inadequate ground cover
Terms you will hear
Class 1 vapor retarder, perm rating, polyethylene, reinforced liner, seam tape, termination bar. These come up in every honest quote for this work. A quote that avoids all of them is describing a product rather than a repair.
What vapor barrier costs
A 1,400 square foot crawl space with a 12-mil reinforced barrier mechanically fastened to the walls and seam-taped generally runs $2,400 to $4,200 in Metro Atlanta.
| Line item | Low | High | Unit |
|---|---|---|---|
| 6-mil polyethylene, floor only, overlapped | $0.6 | $1.1 | sq ft |
| 12-mil reinforced barrier, taped seams, wall termination | $1.4 | $2.6 | sq ft |
| 20-mil reinforced liner, floor and walls | $2.4 | $3.8 | sq ft |
| Pier wrapping and collar detailing | $35 | $90 | per pier |
| Removal and disposal of failed existing barrier | $0.4 | $0.9 | sq ft |
| Soil rough grading before installation | $0.5 | $1.4 | sq ft |
What drives the number
- Square footage and the amount of pier and obstruction detailing required
- Material thickness, from 6-mil polyethylene to 12-mil and 20-mil reinforced liner
- Whether the barrier runs floor-only or continues up the foundation walls
- Removal and disposal of a failed existing barrier
- Clearance height, which changes labor hours more than any other single factor
These ranges are a planning model built for this site, not a survey of what other contractors charge. It has three inputs. Material quantities are taken off a reference 1,400 square foot crawl space with 150 linear feet of foundation wall, priced at Metro Atlanta supplier list rates. Labour hours are costed against Bureau of Labor Statistics wage data for the Atlanta metropolitan area, where the mean hourly wage was $34.57 in May 2025. Permit fees come from the published schedules of the jurisdictions listed on this site. .
Crawl Space Vapor Barrier Installation by city
Dedicated pages, each with that city’s permit office, housing stock and local price factors:
We also cover vapor barrier in these cities. Each city hub carries its local conditions and permit path:
Crawl Space Vapor Barrier Installation: common questions
What is crawl space vapor barrier installation?
A crawl space vapor barrier is a sheet material laid over the crawl space soil to stop water vapor from evaporating out of the ground into the crawl space air, and a Class 1 vapor retarder is one with a permeance of 0.1 perm or less.
How much does vapor barrier cost in Metro Atlanta?
A 1,400 square foot crawl space with a 12-mil reinforced barrier mechanically fastened to the walls and seam-taped generally runs $2,400 to $4,200 in Metro Atlanta. These ranges are a planning model built for this site, not a survey of what other contractors charge.
How long does vapor barrier take?
1 to 2 days on site. The schedule extends when a permit and inspection are involved, or when water has to be intercepted before the main work can start.
Do I need a permit for vapor barrier in Georgia?
Vapor barrier replacement is maintenance and does not require a building permit in Metro Atlanta jurisdictions.
When is vapor barrier the wrong purchase?
A vapor barrier is the right purchase when ground moisture is the problem. If humid outside air entering through open vents is the driver, a barrier alone will not get you below 60 percent relative humidity.
More reading: Crawl Space Encapsulation Problems · Crawl Space Smells Like Cat Pee (And You Have No Cat) · Crawl Space Vents: Open or Closed in Georgia?