Viper CS Crawl Space Vapor Barrier 12 Mil 4 ft x 200 ft

Viper CS Crawl Space Vapor Barrier – 12 Mil, 4 ft x 200 ft

Viper CS Crawl Space Vapor Barrier is a high-performance 12 mil moisture barrier designed for crawl space encapsulation and moisture control. Engineered using cross-woven polyethylene fibers with extrusion coating on both sides, this durable membrane provides superior tear strength, puncture resistance, and long-term vapor protection.

In simple terms: This heavy-duty plastic liner is installed on crawl space floors and walls to stop moisture from entering the home.

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Best For

• Crawl Space Encapsulation Contractors: Moisture control and vapor protection in residential crawl spaces.
• Foundation & Waterproofing Installers: Preventing moisture intrusion beneath homes and structures.

Key Benefits

• 12 mil heavy-duty thickness: Provides strong puncture and tear resistance.
• Cross-woven construction: Engineered for superior strength and durability.
• Moisture and vapor protection: Prevents ground moisture from entering crawl spaces.
• Mold and mildew protection: Helps reduce conditions that cause mold growth.
• Radon and gas barrier: Helps limit soil gases from entering the structure.
• Bright white surface: Improves crawl space visibility and clean appearance.

Typical Uses

• Crawl space encapsulation systems
• Ground moisture barrier installations
• Foundation moisture control
• Basement and crawl space vapor barriers
• Moisture protection beneath structures

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Specifications

Product Type	Crawl space vapor barrier membrane
Brand	Viper CS
Thickness	12 mil
Roll Size	4 ft × 200 ft
Total Coverage	800 sq ft per roll
Material	Cross-woven polyethylene membrane
Color	White
Packaging	25 rolls per pallet

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Installation Notes (Best Practice)

• Overlap seams: Overlap barrier seams at least 12 inches and seal with vapor barrier tape.
• Secure edges: Use mechanical fasteners, termination bars, or adhesive to attach liner to foundation walls.
• Seal penetrations: Pipes and openings should be sealed using vapor barrier tape or mastic.
• Leave inspection gap: Maintain a small gap near the sill plate for termite inspection when required.

Common Questions

Q: What does a crawl space vapor barrier do?
A: It prevents ground moisture from entering the crawl space, helping reduce mold, humidity, and structural damage.

Q: How much area does one roll cover?
A: One roll of this barrier covers approximately 800 square feet.

Q: Is this suitable for crawl space encapsulation?
A: Yes. The 12 mil thickness provides strong moisture protection suitable for crawl space encapsulation systems.