Why Use EVOH Concrete Vapor Barriers in Construction? The Ultimate Guide

This article explores why EVOH concrete vapor barriers are essential in construction and their technical advantages.

Plastika Kritis manufactures high-performance 7-layer EVOH concrete vapor barriers designed to enhance durability and environmental protection in construction projects. 

What is an EVOH Concrete Vapor Barrier?

Moisture intrusion is one of the leading causes of structural issues, flooring failures, and indoor air quality problems in buildings. To combat these risks, concrete vapor barriers play a critical role in modern construction. Among the various types of vapor barriers available, EVOH (Ethylene Vinyl Alcohol) concrete vapor barriers have gained significant traction due to their exceptional resistance to moisture, gases, and volatile organic compounds (VOCs). EVOH is commonly used in industries like food packaging, automotive fuel tanks, and medical applications due to its superior barrier properties.

An EVOH concrete vapor barrier is a multi-layered plastic film designed to block moisture and gas transmission from the subgrade into concrete slabs through its microcracks. Unlike traditional polyethylene (PE) or polyolefin-based barriers, EVOH films are highly effective gas and moisture barriers that significantly reduce permeability.

When applied to construction, EVOH vapor barriers prevent:

• Moisture infiltration, which can cause flooring delamination and mold growth.
• Radon and methane gas intrusion, improving indoor air quality.
• VOC intrusion from contaminated soil, ensuring safer environments.

Why Are Vapor Barriers Needed in Construction?

Moisture-related failures in flooring and concrete structures are one of the most costly and common issues in construction. Studies show that flooring failures due to moisture issues cost the U.S. construction industry alone, over $1 billion annually.

Here’s why vapor barriers are critical:

• Moisture damage: Concrete is a porous material that absorbs and transmits water vapor. If moisture seeps into flooring systems, it can lead to adhesive failure, warping, and microbial growth.
• Gas infiltration: Soil gases such as radon and methane can migrate through slabs, posing serious health risks. The EPA estimates that radon exposure contributes to 21,000 lung cancer deaths per year.
• Flooring warranties: Many flooring manufacturers require a high-performance vapor barrier to honor warranties, as excess moisture can cause premature product failures.
• Structural integrity: Moisture movement can lead to alkali-silica reaction (ASR), reducing the lifespan of concrete structures.

EVOH vs. Traditional Vapor Barriers

Traditional PE barriers may provide basic moisture protection, but they fail to block harmful gases and VOCs. EVOH vapor barriers offer significantly better permeation resistance, ensuring a safer and longer-lasting construction environment.

Plastika Kritis EVOH Vapor Barriers

Plastika Kritis offers a comprehensive range of high-performance ASTM E-1745 Class A vapor barriers designed for moisture and gas protection in construction. Our EVOH-based solutions provide superior gas resistance, while our non-EVOH options deliver cost-effective moisture control. Our wide off-the-shelf range is shown below, while custom versions can be made upon request: 

EVOH Concrete Vapor Barriers

Non-EVOH Concrete Vapor Barriers

Why Choose Plastika Kritis Vapor Barriers?

• Our membranes provide ultra-low permeability to moisture, radon, methane, and VOCs.
• Flexible installation options including spray, taping, and lamination.
• Customization available to match project requirements.

Technical Advantages of EVOH Concrete Vapor Barriers

1. Ultra-Low Permeability to Moisture and Gases

EVOH barriers have some of the lowest permeability ratings in the industry. When tested under ASTM E96 (Water Vapor Transmission Rate), EVOH barriers achieve ≤0.02 perms, far superior to standard PE films.

For gas resistance, EVOH barriers effectively block:

• Radon (Rn): A radioactive gas linked to lung cancer.
• Methane (CH₄): A highly flammable gas found in decomposing organic material.
• Hydrocarbons & VOCs: Common contaminants from industrial sites.

2. Compliance with Industry Standards

In the US, high-performance EVOH barriers meet or exceed industry regulations, including:

• ASTM E-1745: Standard specification for plastic vapor barriers.
• ASTM E96: Water vapor transmission testing.
• ASTM D1434: Gas permeability testing.
• EPA Radon Mitigation Guidelines: Approved for radon-resistant construction.

3. Superior Mechanical Strength and Puncture Resistance

One of the biggest concerns with vapor barriers is puncturing during installation. Our EVOH barriers are engineered with 7-layered co-extrusion technology, premium resins, and advanced formulations, significantly increasing tensile strength and durability. These properties ensure EVOH barriers withstand rough handling, heavy foot traffic, and rebar punctures during concrete placement. Plastika Kritis is one of the first manufacturers worldwide to introduce 8 and 10mil Class A ASTM E-1745 concrete vapor barriers, due to their exceptional mechanical properties despite their low thickness.

4. Long-Term Performance & Cost Savings

While EVOH barriers may have a higher upfront cost than standard PE films, their long-term benefits far outweigh the initial investment:

• Prevention of moisture-related flooring failures ($50,000 - $100,000 repair costs per project).
• Extended building lifespan due to reduced structural degradation.
• Improved indoor air quality and occupant health.

Studies indicate that using high-performance vapor barriers can reduce moisture-related failures by 90% in commercial buildings.

Where Are EVOH Concrete Vapor Barriers Used?

EVOH vapor barriers are ideal for:

• Commercial buildings: Office spaces, shopping malls, and warehouses.
• Hospitals & laboratories: Preventing hazardous chemical infiltration.
• Schools & residential buildings: Ensuring safe indoor air quality.
• Industrial & brownfield sites: Blocking VOCs from contaminated soils.
• Cold storage facilities: Preventing condensation and moisture buildup.

How to Install EVOH Concrete Vapor Barriers

Proper installation is critical to achieving maximum performance. Here’s a step-by-step guide:

1. Surface preparation: Ensure the subgrade is compacted and free of sharp objects.
2. Barrier placement: Unroll the EVOH barrier with minimal stretching and overlap seams by at least 6 inches.
3. Sealing joints: Use manufacturer-recommended tape or welding techniques to create airtight seals.
4. Edge termination: Secure the vapor barrier to foundation walls or footings to prevent lateral gas movement.

Following ASTM E1643 guidelines ensures optimum barrier performance.

Conclusion: Why EVOH Vapor Barriers Are the Best Choice

EVOH concrete vapor barriers offer unparalleled protection against moisture, harmful gases, and VOC infiltration. With ultra-low permeability, superior durability, and compliance with stringent industry standards, they are the gold standard for modern construction.

At Plastika Kritis, we manufacture high-quality EVOH vapor barriers designed to meet the toughest construction challenges. Contact us today to learn how our EVOH barriers can safeguard your next project!