G Tape

Premium Acrylic Substructure Moisture Protection

Protect your deck’s foundation from rot, moisture damage, and structural decay with GTape® Flashing Tape. Engineered with patented Nichigo G-Tape™ technology, this heavy-duty, self-adhering acrylic tape creates an unyielding waterproof barrier over deck joists, beams, and ledger boards. By shielding timber framing from water infiltration and the corrosive chemicals found in pressure-treated lumber, GTape ensures the substructure of your deck lasts as long as the premium boards on top.

The GTape® Advantage: Why Builders Choose It

• Patented Acrylic Adhesive Technology
  Unlike traditional joist tapes made from bitumen, asphalt, or butyl, GTape features an advanced acrylic adhesive layer. It is chemically stable, will not stain or leach over time, and remains completely safe for all building materials.
• 100% Composite & PVC Decking Compatible
  Its pure acrylic formulation guarantees total compatibility with all leading PVC and composite decking brands. It contains zero petroleum-based oils that could break down or negatively react with synthetic board substrates.
• Ultimate All-Weather Performance
  Designed to withstand the toughest jobsite conditions. It applies smoothly across extreme temperature ranges, possesses exceptional UV resistance, and won't melt in intense summer heat or crack during freezing winter weather.
• Revolutionary Tear-by-Hand Convenience
  Despite its incredible industrial tensile strength, GTape can be easily and cleanly torn straight across by hand. This eliminates the need for utility knives on the framing, drastically reducing installation time and increasing safety.
• Smart Repositioning & Self-Sealing Bond
  The specialized adhesive allows you to lift and adjust the tape during installation without losing stickiness. Once deck screws are driven through it, the acrylic membrane self-seals tightly around the threads to prevent water from creeping into screw holes.

Explore the GTape® Series

Our collection features versatile options to match any contractor's preferred workflow:

• Standard GTape Flashing Tape (3040BK Series): The industry benchmark for joist and beam flashing. Available in multiple widths (from 2" to 12") with a clean protective backing liner.
• GTape Flashing Tape with No Liner (G3035BK Series): Maximum efficiency with zero jobsite waste. Just unroll, stick, and tear. Perfect for high-speed installations without the hassle of paper trash.