What is G-tape?

When deciding on what tape to purchase one has to ask “what do I want this tape to do?” Do you want a tape that can be cleanly removed at some point without leaving a residue behind?

Do you want a tape that can be used outdoors and exposed to weather for many months? Or do you want a permanent bond that can offer protection to a building for many decades?

Nichigo G-Tape™ offers a complete line of tapes for construction including surface protection tape, seam tape, HVAC tape, and Acrylic Flashing. 

When you choose G-Tape™ for the job you will be buying the very best. 


1. Joist tape makes your deck substructure more secure.

2. Resistant to temperature change, water intrusion and even moisture & UV exposure.

3. An extended Joist lifespan means extended lifespan for your deck as well!

G-Tape™ 3040BK Joist Tape Full G-Tape™ Lineup

Find out why you need Joist Tape for your decking project

Why Use G-tape?

The woven cloth substrate means that G-Tape is straight-line hand tearable, every time. Additionally, because it is cloth, regardless of how G-Tape is torn, it will not create rough or sharp edges.

Stability and strength are then added with a low-density polyethylene film, in a recent test for 50 year aging they have demonstrated to retain
over 60% adhesion and tensile strength.




Discover Our Full G-Tape Lineup

G-Tape 3045BK

Permanent Bonding

G-Tape 3040BK

Permanent Bonding

G-Tape 3035BK

Deck Joist Flashing

Permanent Bonding

G-Tape 9030BK

Temporary Repair

General Construction

General Surface Protection & Masking

G-Tape 1009CL

Temporary Repair

General Construction

General Surface Protection & Masking


What does Joist tape do?

Joist tape acts as a barrier to protect your joist, and other parts of your deck substructure, from the elements.

This layer of protection seals the deck from moisture, preventing rot, decay and corrosion giving your deck a longer lifespan.

Does Joist tape work?

The answer is definitely YES! You can read more on specific tests done by G-tape like the Long Term Water Sealability report, as well as their Long Term Stability Test.

How do you apply Joist tape?

Make sure the top surfaces of your deck joists are clean and free from dirt, dust, and debris. Next you'll want to measure the length of each joist where you plan to apply the tape. Cut the joist tape into the appropriate lengths using scissors or a utility knife. Start at one end of the joist and peel back a portion of the protective backing on the joist tape. Align the tape with the top surface of the joist and press it down firmly. As you go, continue to peel back the backing and press the tape down, ensuring it adheres smoothly and without wrinkles. You can !--Video--!

What size joist tape should I use?

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Do you need joist tape on pressure treated wood?

Although pressure-treated wood is treated with chemicals to resist decay and rot, that doesn't make it completely immune to moisture infiltration. Using joist tape on your pressure-treated wood will give it an extra layer of protection increasing it's lifespan.

What happens to G-tape as it ages?

G-tape is tested for performance over time by being exposed to a Zenon UV test chamber set to simulate Miami Beach on a clear day, and was exposed to those conditions for the equivalent of 15 years. At the end of test the tape only saw a 30% drop in tensile strength, which means that even after 15 years G-tape retains well over half it's strength!