Alpha® Nichigo G-Tape™ 3035BK Deck Joist & Beam Protection Tape

The Professional's Choice for Deck Framing, Joist Protection & Waterproof Structural Lumber

Protect Your Deck Before Water Has a Chance

The top edge of every deck joist is the most vulnerable part of the entire structure. Rainwater, snow, condensation, and moisture collect around fastener penetrations and sit directly on the horizontal surface of the framing. Over time, that trapped moisture can accelerate rot, decay, splitting, and structural deterioration.

Alpha® Nichigo G-Tape™ 3035BK creates a permanent waterproof barrier between your deck boards and framing members, helping prevent water from reaching the most vulnerable areas of your deck.

Whether you're building a backyard deck, lakefront dock, rooftop deck, boardwalk, pergola, outdoor kitchen, or covered porch, G-Tape 3035BK provides long-term protection where it matters most.

Why Professional Deck Builders Choose G-Tape™

Unlike thick butyl tapes that can bunch up, ooze adhesive, or create uneven deck board surfaces, G-Tape 3035BK features advanced Japanese adhesive technology that delivers exceptional waterproofing while remaining thin, durable, and easy to work with. Users in professional decking communities frequently praise its superior adhesion, easy installation, clean appearance, and ability to perform in wet conditions.

Key Benefits

• Creates a waterproof barrier over deck joists and beams
•  Helps prevent water from pooling on top of framing lumber
•  Self-adhering flashing tape with permanent bond
•  Self-sealing adhesive technology helps protect around fastener penetrations
•  Extremely thin profile minimizes deck board irregularities
•  Hand-tearable—no knife or scissors required
•  UV-resistant black backing withstands prolonged exposure to sun and weather
•  Performs in temperatures from -40°F to 176°F
•  Linerless design for faster installation and less jobsite waste
•  Excellent adhesion even in challenging weather conditions
•  Can be wrapped completely around joists, beams, posts, and critical framing connections
• Meets AAMA 711-13 Type A and AC148 performance requirements

Ideal For

Deck Builders

Protect pressure-treated lumber, LVL framing, beams, rim joists, stair stringers, and ledger areas from long-term moisture damage.

Roofing Contractors

Seal vulnerable framing components, flashing transitions, penetrations, and exposed wood members.

Dock & Waterfront Construction

A must-have for structures exposed to frequent rain, humidity, lakefront conditions, coastal environments, or heavy snow loads.

Outdoor Living Contractors

Ideal for pergolas, gazebos, rooftop decks, covered patios, outdoor kitchens, and elevated platforms.

The Best Choice for High-Rain & High-Moisture Environments

If you're building in the Pacific Northwest, Southeast, coastal regions, mountain communities, lakefront properties, or any area that experiences frequent rainfall, joist protection is no longer optional.

Every rain event introduces moisture to the top surface of deck framing. G-Tape 3035BK helps stop that moisture cycle before it begins by creating a durable waterproof cap over the framing members.

For maximum protection, many professionals wrap the entire joist or beam, sealing both the top surface and exposed edges to create a complete moisture barrier.

Unique Self-Adhering Technology

One of the standout advantages of Nichigo G-Tape is its proprietary adhesive system.

Unlike conventional flashing tapes that can permanently stick to themselves and become unusable, G-Tape's adhesive allows face-to-face contact while maintaining workability during installation. This makes handling easier on ladders, scaffolding, and busy jobsites while still creating a permanent bond to properly prepared substrates.

Community-Proven Performance

Professional deck builders and homeowners consistently report:

• Outstanding adhesion, even in damp conditions

• Easier installation than butyl alternatives

• Thin profile that doesn't telegraph through decking

• Clean black appearance that disappears beneath deck boards

• Long-term confidence for protecting expensive deck structures

• Superior workability compared to thicker flashing tapes

Product Specifications

Manufacturer: Alpha Professional Tools®

Product: Nichigo G-Tape™ 3035BK

Type: Self-Adhering Flashing Tape (Linerless)

Color: Black

Temperature Range: -40°F to 176°F

UV Resistance: High

Bond Type: Permanent

Applications:

• Deck Joists

• Deck Beams

• Ledger Boards

• Rim Joists

• Stair Stringers

• House Wraps

• Window Flashing

• Wall Boards

• Insulation Seams

• Roofing Applications

Available Sizes:

• 2" x 65'

• 3" x 65'

• 4" x 65'

Which one to choose for your application:

3035- Joist and decking protection.

3040- Class 3 protection:  Highly UV resistant, windows and doors, window flashing certified.

3045- Roofing certified for the toughest applications.  Exceptional UV protection, can even function as pond liner tape to provide a permanent seal.

Why Buy G-Tape Instead of Generic Joist Tape?

Because replacing deck boards is expensive.

Replacing rotted framing is even more expensive.

A small investment during construction can help protect thousands of dollars in lumber, labor, fasteners, and future repairs. That's why experienced deck builders consider joist protection one of the smartest upgrades available during deck construction.

Protect the framing. Extend the life of the deck. Build it once.

Order Alpha Nichigo G-Tape™ 3035BK today.

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