Patented 7-Layer EVOH Gas Barrier Tape for Radon, Methane & VOC Protection
GeoSeal® Tape is a patented, single-sided 7-layer gas barrier seam tape engineered for critical vapor intrusion and soil gas mitigation applications. The multilayer backing incorporates a highly impermeable EVOH (ethylene vinyl alcohol) barrier layer designed specifically to block the migration of radon, methane, and volatile organic compounds (VOCs).
An aggressive acrylic adhesive system provides exceptional adhesion to polyethylene geomembranes across a wide temperature range, making GeoSeal® Tape ideal for both below-grade and temperature-variable installations.
Available in 4” x 160’ and 12” x 50’ rolls.
(Minimum $150.00 order)
Advanced 7-Layer Gas Barrier Technology
Unlike conventional seam tapes, GeoSeal® Tape utilizes a multilayer engineered structure that delivers:
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Highly impermeable EVOH gas barrier core
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Superior resistance to methane migration
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Radon gas diffusion control
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VOC vapor intrusion mitigation
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Moisture barrier continuity
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Long-term below-grade durability
The integrated EVOH layer significantly reduces gas transmission compared to standard polyethylene seam tapes.
Designed for Vapor Intrusion Mitigation Systems
GeoSeal® Tape is purpose-built for:
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Radon mitigation barrier systems
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Methane barrier membrane installations
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Brownfield redevelopment projects
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Environmental containment liners
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Under-slab gas barrier systems
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VOC vapor intrusion control
For projects requiring documented gas resistance and regulatory compliance, GeoSeal® provides a higher level of protection than standard seam tapes.
High-Performance Acrylic Adhesive
The aggressive acrylic adhesive system delivers:
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Outstanding adhesion to polyethylene geomembranes
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Strong bond strength across wide temperature ranges
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Excellent aging characteristics
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Long-term dimensional stability
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Reliable field performance
The included release liner ensures clean handling and simplified installation in field conditions.
Typical Applications
Radon Barrier Systems
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Seaming radon membranes
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Repairing punctures in radon barriers
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Sealing around penetrations
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Maintaining barrier continuity at transitions
Methane Mitigation Projects
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Sealing methane barrier liners
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Overlapping gas barrier seams
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Detailing terminations and joints
VOC Vapor Intrusion Control
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Brownfield remediation sites
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Commercial building mitigation systems
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Environmental containment upgrades
GeoSeal® Tape is frequently specified where enhanced gas impermeability is required beyond standard vapor barrier tape performance.
Why Choose GeoSeal® Over Standard Seam Tape?
✔ Patented 7-layer construction
✔ EVOH core for enhanced gas impermeability
✔ Designed specifically for radon and methane mitigation
✔ Acrylic adhesive performs in temperature fluctuations
✔ Suitable for regulated environmental projects
✔ Ideal for under-slab gas barrier installations
When gas containment integrity is critical, GeoSeal® Tape provides a higher-performance sealing solution compared to conventional polyethylene seam tapes.
Available Sizes
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4” x 160’ Roll – Ideal for seam sealing and overlap joints
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12” x 50’ Roll – Ideal for larger repairs and detailing
Refer to the Product Data Sheet for permeability data, adhesive specifications, and installation guidelines.
