Our Services
Vapor Barrier Installation
The foundation of crawl space moisture control. A quality vapor barrier blocks ground moisture from entering your home.
What is Vapor Barrier Installation?
A vapor barrier is a moisture-resistant membrane installed on the crawl space floor (and sometimes walls) to prevent ground moisture from evaporating into the space. While basic 6-mil plastic sheeting was once standard, modern installations use heavy-duty 12-20 mil reinforced polyethylene that resists tears, punctures, and degradation. A properly installed vapor barrier is the single most important component of any crawl space moisture control system.
Key Benefits
- Blocks ground moisture from entering the crawl space
- Prevents mold and mildew growth on surfaces
- Reduces humidity levels significantly
- Protects wood framing from moisture damage
- Creates a cleaner crawl space environment
- Cost-effective first step toward full encapsulation
Our Process
Surface Preparation
The crawl space floor is cleared of debris, sharp objects, and standing water. Grading may be adjusted for proper drainage.
Material Selection
The appropriate vapor barrier thickness is selected based on conditions — 12 mil for standard applications, 20 mil for high-moisture or high-traffic areas.
Floor Installation
The vapor barrier is laid across the entire crawl space floor, overlapping seams by 6-12 inches and extending up foundation walls by 6+ inches.
Seam Sealing
All overlapping seams are sealed with specialized vapor barrier tape to create a continuous moisture barrier.
Securing
The barrier is secured to walls and piers using mechanical fasteners and sealant to prevent movement or gaps.
Typical Cost
$1,500–$5,000
Factors That Affect Your Cost
- Crawl space size
- Vapor barrier thickness (6, 12, or 20 mil)
- Wall coverage (floor only vs. floor and walls)
- Seam sealing method
- Crawl space accessibility
- Current condition of the space
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Vapor Barrier Installation FAQ
For most crawl spaces, a 12-mil reinforced vapor barrier is the minimum recommendation. High-moisture areas or crawl spaces that may see foot traffic should use 20-mil barriers. The old standard of 6-mil plastic is no longer considered adequate for long-term protection.
Related Services
Crawl Space Encapsulation
The gold standard in crawl space protection. Seal out moisture, mold, and pests with a complete encapsulation system.
Learn more →Crawl Space Waterproofing
Stop water intrusion at the source. Comprehensive waterproofing keeps your crawl space dry year-round.
Learn more →Crawl Space Dehumidification
Commercial-grade dehumidifiers keep humidity below 55%, preventing mold and protecting your home year-round.
Learn more →Ready for Vapor Barrier Installation?
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