Tamlyn XtremeFlashing™ Asphalt-Based Tape — Self-Sealing Waterproofing for Windows, Doors & Building Seams
XtremeFlashing™ is a self-adhering, self-sealing waterproofing tape engineered for professional use around windows, doors, building seams, sill plates, wall joints, and general construction flashing applications. It is constructed from a white polymer film carrier coated with Tamlyn's Broad Temperature Spectrum (BTS™) asphalt adhesive, which delivers aggressive bonding performance across a wide range of ambient and surface temperatures. A protective release liner covers the adhesive until installation, keeping the tape clean and ready for precise placement on the job site. This product is part of the Tamlyn Water Management System and is compatible with TamlynWrap® Drainable Wrap, ProSelect™ Commercial Wrap, and ProSelect™ Self Adhered assemblies.
Unlike standard butyl or acrylic flashing tapes, the BTS™ asphalt adhesive actively self-seals around penetrations — including nails and staples driven through the tape — eliminating the leak pathways that conventional tapes leave behind. The system bonds to all common building and window materials, giving contractors a single flashing solution that performs across substrate types without requiring primers or separate sealants for fastener points.
Key Features & Benefits
BTS™ Broad Temperature Spectrum Asphalt Adhesive
The BTS™ adhesive is formulated to maintain bond integrity across a wide temperature range, making it suitable for installations in hot summers and cold winters without losing adhesion or becoming brittle. This eliminates the job-site delays and re-work associated with temperature-sensitive adhesives that fail to tack in cold weather or soften and slip in heat.
Self-Sealing Around Fasteners
When nails or staples penetrate the tape during installation of adjacent materials, the BTS™ adhesive flows back around the fastener shank to create a watertight seal. This is critical for maintaining continuous waterproofing without requiring caulk or additional sealant at every fastener location — a significant labor savings on large window and door installations.
White Polymer Film Facing
The white polymer film facing reflects heat and provides a stable, consistent surface for overlap and integration with housewrap systems. The film facing also contributes to the tape's durability during the construction period before cladding is applied, offering resistance to minor abrasion and handling on busy job sites.
Universal Substrate Bonding
XtremeFlashing™ bonds to all common building and window materials including OSB, plywood, concrete board, aluminum, vinyl, wood, and fiberglass window frames. Contractors do not need to stock multiple tape products for different substrates — one tape works across the entire building envelope.
Release Liner for Precise Installation
The removable release liner protects the adhesive face during handling and transport, preventing premature bonding and contamination. This allows the tape to be pre-cut and positioned before commitment, improving accuracy on complex window rough openings and door jamb details.
15-Year Product Warranty / 25-Year System Warranty
XtremeFlashing™ carries a 15-year product-only limited warranty against manufacturing defects when installed per Tamlyn guidelines. When used as part of the complete Tamlyn Water Management System — including TamlynWrap® Drainable Wrap, XtremeSeam™ Tape, and XtremeSealant™ — the assembly qualifies for a 25-year product and labor limited warranty with project registration.
Common Applications
Window Sill Flashing
Install at the window rough opening sill to prevent moisture infiltration that leads to rot, mold, and mildew in the framing. The tape's self-sealing adhesive maintains a watertight barrier even after the window is fastened in place.
Window Flange-to-Wall Sealing
Use to seal the perimeter flange of window units to the building wall in new construction, creating a continuous waterproof transition between the window frame and the weather-resistive barrier.
Door Flashing
Apply around door rough openings, including head and jamb conditions, to redirect incidental water away from the framing and prevent accumulation at the door pan.
Under Siding Flashing
Install at horizontal transitions, laps, and penetrations beneath siding systems where bulk water management is required but long-term UV exposure will be blocked by the cladding.
Exterior Plaster and Stucco Systems
Apply at penetrations, reveals, and control joints in exterior plaster systems to create a waterproof backing layer that complements the lath and plaster assembly.
Sill Plates and Wall Joints
Use at sill plate-to-foundation transitions and wall-to-wall seam conditions to prevent capillary moisture migration into framing members at the base of the wall assembly.
General Construction Flashing
Suitable for any flashing application where the membrane will be protected from long-term direct UV exposure, including roof-to-wall transitions, deck ledger boards, and penetration boot laps.
Compatible Materials
- OSB (oriented strand board)
- Plywood sheathing
- Concrete board / cement board
- Aluminum window and door frames
- Vinyl window and door frames
- Wood window and door frames
- Fiberglass window and door frames
- TamlynWrap® Drainable Wrap
- TamlynWrap® ProSelect™ Commercial Wrap
- TamlynWrap® ProSelect™ Self Adhered
- XtremeSeam™ Tape (system use)
- XtremeSealant™ / Tamlyn® BrunnoSeal® (system use)
- XtremeCorners™ (system use)
- All common building and window materials per Tamlyn installation guidelines
Available Sizes
| Item ID | Width | Length | Thickness | Best For |
|---|---|---|---|---|
| WS25-4 | 4" | 75' | 25 mil | Window flanges, standard rough openings, sill plates |
| WS25-4/100 | 4" | 100' | 25 mil | High-volume window flange work, contractor rolls |
| WS25-6 | 6" | 75' | 25 mil | Door jambs, wider sill coverage, wall joints |
| WS25-6/100 | 6" | 100' | 25 mil | High-volume wider flashing applications |
| WS25-9 | 9" | 75' | 25 mil | Wide sill flashing, deck ledger boards, broad transitions |
| WS25-9/100 | 9" | 100' | 25 mil | High-volume wide flashing, commercial projects |
| WS25-12 | 12" | 75' | 25 mil | Large openings, sill pan flashing, broad coverage areas |
Product Documents
Application Instructions
Surface Preparation
- Ensure all substrate surfaces are clean, dry, and free of dust, oil, frost, and loose debris prior to application.
- Confirm the substrate is structurally sound and that all framing is properly installed per applicable building codes.
- For window sill applications, ensure the rough opening sill is sloped or shimmed to drain outward where required by design.
Installation
- Cut XtremeFlashing™ tape to the required length before removing the release liner.
- Position the tape over the target area — begin at the sill, then proceed to the jambs, then the head — overlapping each successive piece per standard flashing sequence.
- Peel the release liner as you press the tape firmly into place, working out air bubbles and ensuring full contact with the substrate.
- Use a roller or seam roller to press the tape firmly along all edges and seams to ensure complete adhesion and eliminate voids.
- At corners, fold or notch the tape as required to maintain a continuous waterproof layer — use XtremeCorners™ or Tamlyn-approved bowtie methods for inside and outside corner conditions.
- Seal any tape seams or transitions with XtremeSealant™ or Tamlyn® BrunnoSeal® as required by the project specification or warranty requirements.
- Install TamlynWrap® housewrap over the flashing in correct shingled sequence (bottom to top) to complete the water-managed assembly.
- Use XtremeSeam™ Tape to seal all housewrap seams and laps per Tamlyn installation guidelines.
System Warranty Activation
- Register the project for the 25-year product and labor warranty by completing the Tamlyn Water Management System Warranty Registration form.
- Submit registration via fax to 281-499-8948 or email to warrantyreg@tamlyn.com prior to or shortly after installation.
- Retain proof of purchase for all Tamlyn system components for warranty claim purposes.
Technical Specifications
| Specification | Details |
|---|---|
| Product Name | XtremeFlashing™ Asphalt-Based Self-Adhering Flashing Tape |
| Adhesive Type | BTS™ (Broad Temperature Spectrum) Asphalt Adhesive |
| Facing / Film | White Polymer Film |
| Thickness | 25 mil (all sizes) |
| Available Widths | 4", 6", 9", 12" |
| Available Lengths | 75' and 100' rolls |
| Self-Sealing | Yes — seals around nails and staples |
| Release Liner | Yes — removed during installation |
| UV Exposure | Not intended for long-term direct UV exposure; must be covered by cladding or siding |
| Product Warranty | 15-year limited product warranty against manufacturing defects |
| System Warranty | 25-year product and labor limited warranty when installed as complete Tamlyn Water Management System (project registration required) |
| Warranty Contact | 1-800-334-1676 / www.tamlyn.com |
| Compatible System Products | TamlynWrap® Drainable Wrap, ProSelect™ Commercial Wrap, ProSelect™ Self Adhered, XtremeSeam™ Tape, XtremeSealant™, Tamlyn® BrunnoSeal®, XtremeCorners™ |
Frequently Asked Questions
Q: Does XtremeFlashing™ tape require a primer before application?
A: No. The BTS™ asphalt adhesive is formulated to bond directly to all common building and window materials — OSB, plywood, vinyl, aluminum, wood, fiberglass, and concrete board — without a separate primer in standard conditions. Ensure surfaces are clean and dry before application.
Q: Will the tape seal itself if I nail through it after installation?
A: Yes. The BTS™ adhesive is self-sealing and will flow back around nail shanks, staples, and other small fasteners driven through the tape, maintaining a watertight barrier without additional caulking at each penetration point.
Q: Can XtremeFlashing™ be left exposed to UV after installation?
A: No. XtremeFlashing™ is not designed for long-term ultraviolet exposure and must be protected by an overlying cladding system — siding, stucco, or exterior plaster — within a reasonable time after installation. Applications requiring UV resistance should use a UV-stable product.
Q: What do I need to qualify for the 25-year system warranty?
A: The 25-year product and labor warranty requires installation of XtremeFlashing™ as part of the complete Tamlyn Water Management System, including TamlynWrap® Drainable Wrap or ProSelect™ Commercial Wrap, XtremeSeam™ Tape, XtremeSealant™ or BrunnoSeal®, and cap fasteners throughout. Project registration must be submitted to Tamlyn at warrantyreg@tamlyn.com or fax 281-499-8948.
Q: Which width should I select for standard residential window installations?
A: The 4" width (WS25-4 or WS25-4/100) is typically used for window flange-to-sheathing sealing and sill plate coverage on standard residential windows. The 6" and 9" widths are suited for wider sill conditions, door jambs, and applications requiring broader waterproofing coverage.
Q: Is there a difference between the 75' and 100' roll lengths other than quantity?
A: No — the product is identical in width, thickness, and adhesive formulation. The 100' rolls (suffix /100 in the item ID) provide more linear footage per roll, which reduces roll changes on larger projects and can improve jobsite efficiency for high-volume installations.