Butyl Seal Tape

High-Performance Double-Sided Butyl Seal Tape for Geomembrane & Vapor Barrier Seaming

Butyl Seal Tape is a 40 mil, double-sided reinforced butyl rubber tape engineered for aggressive adhesion and long-term flexibility. Designed for joining polyethylene (PE) and polypropylene (PP) geomembranes, vapor barriers, and construction films, this tape provides a dependable mechanical bond where thermal welding is not required or practical.

Its non-hardening formulation remains pliable over time, allowing it to accommodate minor substrate movement while maintaining continuous contact and seal integrity.

Engineered for Strong, Flexible Seams

The reinforced butyl core delivers:

• Aggressive adhesion to polyethylene and polypropylene

• Strong bonding to properly prepared concrete surfaces

• Long-term flexibility without cracking or drying out

• Excellent conformability to irregular surfaces

• Reliable compression seal between overlapping panels

Unlike solvent-based adhesives, butyl tape provides immediate tack and consistent performance without cure time.

Primary Applications

Butyl Seal Tape is commonly used for:

• Overlap seaming of geomembrane liner panels

• Vapor barrier perimeter sealing

• Sealing liner transitions to concrete walls and footings

• Repair patches on compatible liner materials

• Detail work around penetrations

• Temporary containment systems

It is especially useful in field conditions where extrusion welding is not feasible or where mechanical attachment must be supplemented with a compression seal.

Ideal for Liner-to-Concrete Transitions

When bonding polyethylene or polypropylene liners to concrete:

1. Ensure concrete is clean, dry, and free of laitance, dust, oil, or debris.

2. Prime or mechanically prepare surface if required.

3. Apply consistent pressure after placement to ensure full contact.

4. Terminate with mechanical fastening or termination bar when specified.

Proper surface preparation significantly improves long-term bond performance.

Performance Advantages

• 40 mil thickness provides enhanced sealing capacity

• Reinforced construction resists stretching during installation

• Remains flexible in varying temperatures

• Resistant to moisture intrusion

• Easy to handle and apply in the field

The aggressive tack allows installers to position and compress overlaps efficiently, reducing labor time compared to liquid bonding methods.

Available Sizes

• 2” x 50’ roll

• 6” x 50’ roll

• Case quantities available

(Minimum $150.00 order applies.)

Installation Best Practices

For optimal seam performance:

• Overlap panels according to project specification (typically 3–6 inches).

• Apply tape evenly along the seam area without gaps.

• Remove release liner carefully to prevent contamination.

• Use firm hand pressure or roller to ensure full compression contact.

• Supplement with mechanical attachment where required by design.

Field conditions such as temperature and surface cleanliness directly impact adhesion performance.

Typical Projects

• Pond liner installations

• Secondary containment systems

• Under-slab vapor barriers

• Tank liner transitions

• Agricultural containment

• Construction moisture control systems

When to Use Butyl Tape vs. Welding

Butyl Seal Tape is ideal when:

• Thermal welding equipment is unavailable

• Working with thin vapor barriers

• Performing temporary installations

• Sealing liner-to-concrete transitions

For critical containment seams requiring structural fusion, extrusion or wedge welding may be specified. In many detailing applications, butyl tape serves as a reliable complementary sealing method.