G-Tape 3045BK EPDM Rubber Flashing & Waterproof Seam Tape – 2" to 12"

Nichigo G-Tape 3045BK is a premium waterproof flashing and seam tape engineered for difficult-to-bond materials, especially EPDM rubber and other low-surface-energy surfaces. Designed for roofing contractors, waterproofing professionals, deck builders, remodelers, and exterior construction crews, 3045BK combines an extremely aggressive permanent acrylic adhesive with a durable waterproof backing for long-term outdoor performance.

Where ordinary construction tapes can struggle to maintain adhesion to rubber membranes, G-Tape 3045BK is specifically engineered for exceptional bonding to EPDM. Its approximately 166 oz/in peel adhesion and high static shear make it an excellent choice for EPDM roofing seams, rubber membrane flashing, rubber repairs, waterproof exterior seams, roof flashing, deck waterproofing, and other applications where maximum adhesion matters.

G-Tape also recommends 3045BK as an alternative to traditional asphalt and butyl flashing tapes. It provides strong permanent adhesion without the excessive bulk and mess associated with many conventional waterproofing membranes, while still offering excellent resistance to water, UV exposure, weather, chemicals, solvents, and abrasion.

Available in 2", 3", 4", 6", 9", and 12" widths on 65-foot rolls, G-Tape 3045BK can handle everything from narrow EPDM membrane seams and rubber repairs to wide roof flashing, deck waterproofing, window and door flashing, and large exterior construction details.

Premium EPDM Seam Tape & Rubber Roofing Tape

EPDM is one of the most widely used rubber roofing and waterproofing materials, but its low surface energy can make it difficult for ordinary tapes and adhesives to bond reliably.

G-Tape 3045BK was developed specifically for these challenging surfaces. Its proprietary acrylic adhesive provides excellent adhesion and high static shear on rubber, making it a strong choice for seaming EPDM sheets, repairing rubber roofing components, reinforcing membrane transitions, and creating waterproof exterior details.

For contractors searching for EPDM tape, EPDM seam tape, EPDM flashing tape, rubber roofing tape, rubber membrane tape, or EPDM roof repair tape, 3045BK provides a professional permanent-bond solution designed around the material itself.

Exceptional Adhesion to EPDM & Rubber

The defining feature of G-Tape 3045BK is adhesion.

G-Tape rates the product at approximately 166 oz/in peel adhesion, giving it substantially more holding power than many lighter flashing tapes.

That increased adhesion is especially valuable on low-surface-energy materials such as EPDM rubber, where conventional acrylic or utility tapes may struggle to develop or maintain a reliable bond.

When installed on a properly prepared surface, 3045BK creates a strong permanent bond intended for demanding outdoor waterproofing and repair applications.

Waterproof EPDM Roof Repair Tape

G-Tape 3045BK can be used for waterproof repair work on compatible EPDM roofing and rubber membrane systems.

Its combination of strong rubber adhesion, waterproof construction, UV resistance, and long-term outdoor durability makes it useful for reinforcing seams, repairing compatible rubber components, and addressing localized exterior waterproofing details.

For EPDM roof repairs, proper surface preparation is critical. Dirt, oils, oxidation, standing water, and contamination can reduce adhesion even when using a high-performance tape. Always clean and dry the repair area before applying 3045BK and follow the membrane manufacturer's repair requirements where applicable.

Rubber Membrane Seam Tape

Rubber sheet seams can be difficult to seal with standard construction tapes because the adhesive must remain bonded through heat, cold, rain, sunlight, and movement of the membrane.

G-Tape 3045BK is specifically recommended for seaming rubber sheets and provides strong static shear on rubber surfaces.

This makes it useful for EPDM membrane seams, rubber waterproofing sheets, exterior rubber components, and other compatible low-surface-energy applications where maintaining a permanent bond is essential.

Alternative to Butyl Flashing Tape

Butyl tape is commonly used for exterior waterproofing because of its ability to remain flexible and resist moisture. However, traditional butyl products can be thick, messy, difficult to handle, and prone to adhesive transfer during installation.

G-Tape specifically positions 3045BK as an alternative to butyl tape and asphalt-based flashing products in appropriate applications.

The acrylic adhesive system provides high peel strength and excellent outdoor resistance without relying on a thick traditional butyl layer.

For contractors searching for a butyl tape alternative, butyl flashing tape replacement, waterproof seam tape, or high-adhesion exterior flashing tape, G-Tape 3045BK offers a clean, professional option.

Alternative to Asphalt Flashing Tape

Asphalt-based flashing materials have been used for decades, but they can be bulky, dirty to install, and difficult to work with in detailed construction areas.

G-Tape 3045BK provides an acrylic adhesive alternative with strong adhesion, waterproof construction, and excellent resistance to sunlight and weather.

This makes it useful for contractors who want permanent exterior waterproofing without the mess associated with many asphalt-backed tapes.

UV-Resistant Waterproof Roofing Tape

Exterior roof flashing and membrane repairs can be exposed to direct sunlight for long periods, making UV resistance an important part of tape selection.

G-Tape 3045BK is highly resistant to UV exposure and weather, allowing it to maintain performance in demanding outdoor conditions.

Its black waterproof backing is also resistant to chemicals, solvents, and abrasion, making it suitable for roofing and exterior construction environments where the tape may encounter much harsher conditions than ordinary indoor flashing products.

Extreme-Duty Waterproof Flashing Tape

G-Tape 3045BK is built for applications where basic masking or construction tape is not enough.

The combination of approximately 9.4 mil thickness, 166 oz/in peel adhesion, waterproof construction, high UV resistance, and excellent rubber bonding makes it a true extreme-duty exterior flashing tape.

It can be used for permanent exterior seams, repairs, waterproof transitions, flashing details, and difficult surfaces where a lighter-duty product may not provide sufficient adhesion.

Deck Waterproofing & Exterior Framing

Although EPDM and rubber bonding are the strongest reasons to choose 3045BK, the tape can also be used in demanding deck and exterior framing applications where waterproofing and maximum adhesion are priorities.

It can be used to protect deck beams, joists, ledger areas, framing transitions, posts, and other exterior construction details where repeated exposure to moisture can shorten the life of the structure.

Contractors building decks with premium composite, PVC, hardwood, or long-life decking materials can use flashing tape to help protect the framing underneath from water passing through the deck surface.

Deck Beam & Joist Flashing Tape

Rainwater naturally drains between deck boards and onto the framing underneath. Horizontal surfaces such as joists and beams can remain damp long after the deck surface has begun to dry.

G-Tape 3045BK provides a waterproof barrier between the framing and repeated moisture exposure.

The 2", 3", and 4" widths work well for narrower framing details, while 6", 9", and 12" rolls provide much greater coverage for beams, ledgers, built-up framing, and wide waterproofing applications.

If the primary job is simply covering hundreds of standard deck joists, G-Tape 3035BK may offer faster linerless installation. Choose 3045BK when stronger adhesion, rubber compatibility, or more demanding waterproofing performance is the priority.

Window & Door Flashing Tape

The wide size range also makes G-Tape 3045BK useful for window flashing, door flashing, and exterior building-envelope waterproofing.

Wider 6", 9", and 12" rolls can cover sill areas, jambs, exterior transitions, and other large flashing details with fewer seams.

G-Tape 3045BK meets AAMA 711-13 Type A without primer, Level 3, and AC148 requirements, giving contractors a professional flashing tape suitable for demanding exterior construction applications.

Low-Surface-Energy Flashing Tape

Some materials naturally resist adhesives because they have a low surface energy. EPDM rubber is a prime example.

G-Tape 3045BK is classified as a premium low-surface-energy flashing tape because it was engineered to develop stronger adhesion on these difficult materials.

This makes it useful in specialty construction, roofing, waterproofing, and repair applications where ordinary flashing tape may not bond reliably enough.

Key Features

Exceptional EPDM Adhesion

Specially engineered acrylic adhesive provides excellent bonding and high static shear on EPDM rubber and similar difficult-to-bond surfaces.

Approximately 166 oz/in Peel Adhesion

Extremely high peel adhesion provides the strong permanent bond required for demanding roofing, waterproofing, and exterior repair applications.

Waterproof Construction

Designed for long-term exterior applications where exposure to rain, snow, moisture, and weather is unavoidable.

Premium Rubber Seam Tape

Excellent for seaming rubber sheets, EPDM roofing membranes, waterproof rubber assemblies, and compatible rubber components.

Butyl & Asphalt Tape Alternative

Provides a high-adhesion acrylic alternative to many traditional asphalt or butyl flashing products.

Highly UV Resistant

Designed to withstand prolonged exposure to sunlight without the rapid deterioration associated with ordinary utility tapes.

Highly Weather Resistant

Built to perform through demanding outdoor conditions, temperature changes, precipitation, and seasonal weather exposure.

Chemical & Solvent Resistant

Increased chemical and solvent resistance makes 3045BK suitable for professional construction and roofing environments.

High Abrasion Resistance

Durable backing stands up to handling and exterior construction conditions better than lightweight paper or general-purpose tapes.

Hand Tearable

Tears straight by hand, allowing installers to make quick cuts without constantly reaching for a utility knife or scissors.

Wide Temperature Range

Designed for use across temperatures from approximately -40°F to 200°F.

Six Available Widths

Available from 2" through 12" wide for everything from narrow EPDM seams to large roofing and exterior flashing details.

Recommended Applications

• EPDM roofing seams
• EPDM roof repair
• Rubber membrane seams
• Rubber sheet waterproofing
• Rubber component repairs
• Roof flashing
• Waterproof roof repairs
• Exterior membrane transitions
• Low-surface-energy materials
• Butyl tape replacement applications
• Asphalt flashing tape replacement applications
• Deck waterproofing
• Deck joist protection
• Deck beam flashing
• Ledger waterproofing
• Exterior framing protection
• Window flashing
• Door flashing
• Exterior waterproofing
• Permanent exterior repairs

Available G-Tape 3045BK Sizes

2" x 65' G-Tape 3045BK

Part Number: 3045BK-GT-2-65
Width: 2"
Length: 65'
Color: Black
Bond: Permanent
Best For: EPDM seams, narrow rubber repairs, deck joists, detailed waterproofing

3" x 65' G-Tape 3045BK

Part Number: 3045BK-GT-3-65
Width: 3"
Length: 65'
Color: Black
Bond: Permanent
Best For: Rubber membrane seams, EPDM repairs, deck flashing

4" x 65' G-Tape 3045BK

Part Number: 3045BK-GT-4-65
Width: 4"
Length: 65'
Color: Black
Bond: Permanent
Best For: EPDM flashing, beam protection, exterior waterproofing

6" x 65' G-Tape 3045BK

Part Number: 3045BK-GT-6-65
Width: 6"
Length: 65'
Color: Black
Bond: Permanent
Best For: Roof membrane flashing, window flashing, wide rubber seams

9" x 65' G-Tape 3045BK

Part Number: 3045BK-GT-9-65
Width: 9"
Length: 65'
Color: Black
Bond: Permanent
Best For: Roofing repairs, large flashing details, wide waterproof transitions

12" x 65' G-Tape 3045BK

Part Number: 3045BK-GT-12-65
Width: 12"
Length: 65'
Color: Black
Bond: Permanent
Best For: Large EPDM repairs, wide roof flashing, exterior waterproofing

G-Tape 3045BK Technical Specifications

3035BK vs. 3040BK vs. 3045BK – Which G-Tape Should You Choose?

G-Tape offers multiple professional flashing products because different applications require different adhesive characteristics.

Choose G-Tape 3035BK when fast linerless installation is the priority, especially for repetitive deck joist and general exterior flashing work.

Choose G-Tape 3040BK when you want heavier construction, strong general-purpose flashing performance, wide sizes, and documented self-healing around appropriate steel and galvanized aluminum fasteners.

Choose G-Tape 3045BK when maximum adhesion to EPDM rubber, rubber membranes, or other difficult low-surface-energy surfaces is the priority.

If you're working with rubber roofing or a surface ordinary flashing tape has trouble bonding to, 3045BK is the product we would look at first.

How to Install G-Tape 3045BK

Begin with a clean, dry surface. Remove dirt, dust, standing water, oils, oxidation, release agents, and other contaminants that could interfere with adhesive contact.

Position the tape carefully over the seam, flashing detail, or repair area and press it firmly into the substrate. Apply consistent pressure across the entire tape surface to maximize adhesive contact.

When seaming EPDM or rubber membrane, make sure both surfaces are properly prepared before application. Rubber roofing systems may have specific cleaning, priming, or repair procedures, so always follow the membrane manufacturer's requirements for critical roof repairs.

On exterior flashing details, overlap tape and surrounding waterproofing materials in a manner that directs water toward the exterior rather than behind the assembly.

Important Installation Notes

• Apply to clean, dry surfaces.
• Remove oil, dirt, dust, oxidation, and contamination before bonding.
• Press firmly across the complete bonded area.
• Test compatibility on unfamiliar substrates before full installation.
• Follow roofing membrane manufacturer instructions for critical EPDM repairs.
• Follow applicable building codes for roofing, window, door, and exterior flashing applications.
• Do not use as electrical insulating tape.

Why Contractors Choose G-Tape 3045BK

The biggest challenge with rubber roofing and low-surface-energy materials is not making the tape waterproof. It is getting the adhesive to stay bonded to the material in the first place.

That is where 3045BK separates itself from ordinary flashing tape.

G-Tape engineered the adhesive specifically for strong bonding and high static shear on EPDM and rubber. Add approximately 166 oz/in peel adhesion, waterproof construction, strong UV and weather resistance, and a size range from 2" to 12", and you have an unusually versatile exterior waterproofing tape.

Use it for EPDM seams, rubber roofing repairs, membrane transitions, wide flashing details, deck waterproofing, exterior repairs, and other applications where traditional tape struggles to stay bonded.

BladeRunner's Take on G-Tape 3045BK

If you are working with EPDM or rubber, this is the G-Tape we would reach for first.

The 3045BK is not simply a heavier version of ordinary flashing tape. Its real advantage is the adhesive formulation designed specifically for difficult low-surface-energy materials.

With roughly 166 oz/in of peel adhesion, excellent rubber bonding, waterproof construction, high UV resistance, and resistance to chemicals, solvents, and abrasion, it is built for exterior applications where failure is expensive.

It is also a very compelling alternative when you want to get away from thick, messy asphalt or butyl flashing tapes.

For contractors searching for a premium EPDM seam tape, rubber roof repair tape, rubber flashing tape, waterproof roofing tape, butyl tape alternative, or extreme-duty exterior flashing tape, G-Tape 3045BK belongs at the top of the list.