Double Sided Seam Tape 2" x 65' - 12 rolls/box

Tamlyn XtremeSeam Tape — Double-Sided Butyl Tape for Horizontal and Vertical WRB Seam Sealing

The Tamlyn XS265 XtremeSeam Tape is a 2-inch wide by 65-foot double-sided butyl tape engineered specifically for sealing horizontal and vertical overlaps in weather-resistive barrier (WRB) systems. Formulated from a unique blend of butyl, E.P.D.M., and polyisobutylene elastomers, it is designed for use by roofing and building envelope contractors who require a high-performance splicing material that maintains integrity under extreme service conditions. It is a required component in the Tamlyn Water Management System when paired with TamlynWrap Drainable Wrap, ProSelect Commercial Wrap, and ProSelect Self Adhered products for 25-year system warranty eligibility. XtremeSeam Tape is compatible with commonly used insulation materials where the extruded profile has been altered to meet specific requirements.

Unlike standard seam tapes, XtremeSeam Tape is carefully cross-linked to achieve the precise level of creep resistance needed without introducing excessive rebound and recovery — keeping the material's energy level at the splice minimum and ensuring long-term splice integrity. This compound engineering means the tape maintains elasticity and bonding performance when subjected to severe UV exposure, thermal shock, stagnant water, and extreme low temperatures, all conditions that cause conventional seam tapes to fail prematurely. It exceeds all requirements of the single-ply roofing industry for splicing material.

Key Features & Benefits

Butyl, E.P.D.M., and Polyisobutylene Elastomer Blend

The tri-component elastomer formula delivers a balance of adhesion, flexibility, and weather resistance that single-material tapes cannot match. Each component contributes distinct performance properties — butyl for air and moisture impermeability, EPDM for UV and ozone resistance, and polyisobutylene for low-temperature flexibility — resulting in a tape that performs reliably across a wide range of climates and job site conditions.

Controlled Cross-Linking for Creep Resistance

The compound is cross-linked to a precise degree that guarantees the desired creep resistance without allowing excessive rebound and recover. This engineering choice holds the material's energy level at the splice minimum, which means the tape stays in place over time without pulling away from the substrate or creating stress concentrations at the seam edge.

Maintains Elasticity Under Extreme Conditions

XtremeSeam Tape retains elasticity and splice integrity when subjected to severe ultraviolet rays, thermal shock, stagnant water, and extremely low temperatures. For contractors working in climates with wide temperature swings or high UV exposure, this means the seam remains sealed through seasonal cycling rather than embrittling and cracking.

Double-Sided Adhesive Construction

The double-sided format allows the tape to bond the lapping layers of WRB material together, which is vital for maintaining proper shingling on horizontal laps. This prevents wind-driven rain from infiltrating at the seam and ensures the water management system performs as designed throughout the life of the building envelope.

Exceeds Single-Ply Roofing Industry Splicing Requirements

Meeting and exceeding the requirements of the single-ply roofing industry for splicing material gives specifiers and contractors confidence that the product is tested to rigorous standards. This also simplifies specification compliance on commercial projects where roofing-grade performance standards are referenced.

Required Component for 25-Year Tamlyn System Warranty

When installed as part of the complete Tamlyn Water Management System — including TamlynWrap Drainable Wrap or ProSelect products, XtremeFlashing Tape, and XtremeSealant or BrunnoSeal — XtremeSeam Tape is a required accessory to qualify for the 25-year product and labor limited warranty. Using it ensures the full system warranty is available to the building owner, which can be a key differentiator on commercial and residential projects.

Common Applications

Horizontal WRB Lap Sealing

XtremeSeam Tape is specifically engineered to seal horizontal laps in weather-resistive barrier installations, maintaining the critical shingling principle that directs water down and out of the wall assembly rather than into it.

Vertical WRB Seam Sealing

The tape bonds vertical overlaps in WRB systems, preventing air and moisture infiltration at end-to-end seams where two rolls of wrap meet, ensuring continuity of the weather barrier across the entire wall plane.

Single-Ply Roofing Splices

Exceeding all single-ply roofing industry requirements for splicing material, XtremeSeam Tape is suited for use in low-slope or flat roofing membrane seam applications where a durable, long-term bond is required.

Insulation Board Seam Bonding

XtremeSeam Tape can be used to bond to commonly used insulation materials in situations where the material's extruded profile is altered to meet specific project requirements. Users should verify compatibility with the manufacturer prior to application.

Commercial Building Envelope Systems

As a component of the Tamlyn Water Management System, XtremeSeam Tape is used on commercial projects requiring code-compliant, warranted water management assemblies, including projects specifying TamlynWrap ProSelect Commercial Wrap.

Residential Drainable Wrap Installations

In residential construction using TamlynWrap Drainable Wrap, XtremeSeam Tape seals all WRB seams as part of the warranted system, supporting long-term moisture management performance in new construction and renovation projects.

Compatible Materials

• TamlynWrap Drainable Wrap
• TamlynWrap ProSelect Commercial Wrap
• TamlynWrap ProSelect Self Adhered (tape not required with this product)
• Single-ply roofing membranes
• Commonly used insulation board materials (verify extruded profile compatibility with manufacturer)
• Standard building substrates used in conjunction with WRB systems

Product Documents

• Installation Instructions
• Catalog Page
• Product Brochure
• MSDS / Safety Data Sheet

Application Instructions

Surface Preparation

1. Ensure the WRB or substrate surface is clean, dry, and free of dust, debris, and contaminants prior to tape application.
2. Verify that the substrate temperature and ambient conditions are within acceptable ranges for butyl adhesive bonding — consult the installation instructions for specific temperature guidance.
3. For insulation board applications, confirm the extruded profile of the insulation is compatible with the tape adhesive by checking with the manufacturer.

Application

1. Position XtremeSeam Tape along the seam or overlap area, centering it over the lap line as required by the installation instructions.
2. Remove the release liner from one side and press the tape firmly into position on the first substrate layer.
3. Remove the second release liner and press the overlapping WRB layer down onto the exposed adhesive, working from one end to the other to avoid air pockets.
4. Apply firm, even pressure across the full width and length of the tape using a roller or hand pressure to ensure full contact bonding.
5. Ensure all horizontal laps are shingled correctly so water drains over the tape rather than toward it.

Cleanup

1. Tools and equipment used during application may be cleaned with mineral spirits.
2. Dispose of release liners and waste material in accordance with local regulations.

Technical Specifications

Safety Data Summary

Hazard Information

• Full hazard information available in the MSDS — download from the Product Documents section above
• Contains butyl and polyisobutylene elastomers; review MSDS prior to use for complete hazard classification

Personal Protective Equipment

• Consult MSDS for specific PPE requirements
• Standard construction PPE (gloves, eye protection) recommended during handling and application

Safe Handling

• Store rolls in a dark, cool place to maintain shelf life of 12 months from delivery date
• Do not expose to direct sunlight or high heat during storage
• Clean tools and equipment with mineral spirits immediately after use
• Dispose of waste materials in accordance with local, state, and federal regulations

Frequently Asked Questions

Q: Is XtremeSeam Tape required to qualify for the Tamlyn 25-year system warranty?
A: Yes. XtremeSeam Tape is a required component of the Tamlyn Water Management System when using TamlynWrap Drainable Wrap or ProSelect Commercial Wrap to qualify for the 25-year product and labor limited warranty. It is not required when using TamlynWrap ProSelect Self Adhered.

Q: What is the shelf life of XtremeSeam Tape and how should it be stored?
A: Shelf life is 12 months from the delivery date, provided the rolls are stored in a dark and cool place. Exposure to light or heat will degrade the adhesive and reduce the usable life of the product.

Q: Can XtremeSeam Tape be used with insulation board materials?
A: Yes, but with a condition. It can bond to commonly used insulation materials in situations where the material's extruded profile has been altered to meet the specific requirement. Users should check with Tamlyn directly to confirm compatibility before application.

Q: How many rolls come per carton and what is the freight classification?
A: Each carton contains 12 rolls (2 in x 65 ft each). The product ships as Class 55, Item #149610, NOIBN — no red hazmat label is required, simplifying freight logistics.

Q: What can I use to clean tools after applying XtremeSeam Tape?
A: Tools and equipment used during application can be cleaned easily with mineral spirits.

Q: Does XtremeSeam Tape meet roofing industry standards for splicing?
A: Yes. XtremeSeam Tape exceeds all requirements of the single-ply roofing industry for splicing material, making it suitable for both wall WRB seam sealing applications and single-ply roofing membrane splices.