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G-Tape is a self-adhering acrylic flashing tape that creates a permanent, waterproof barrier on deck joists, beams, ledger boards, and posts — protecting your deck's substructure from rot, decay, and moisture damage for the life of the build.
Unlike butyl flashing tapes, which come as sticky, hard-to-handle black goo prone to sticking to themselves in the roll, G-Tape uses an acrylic adhesive that tears cleanly by hand, repositions without leaving residue during installation, and doesn't stick to itself — so unused portions aren't wasted. The adhesive carries a negative charge that's drawn to steel fasteners, letting it seep into the wood grain around nails and screws to seal out water completely.
Why G-Tape Outperforms Standard Joist Tape
Available Sizes (all 65' rolls)
Frequently Asked Questions
What's the difference between G-Tape 3035BK and 3040BK?The 3035BK sizes (2" and 4") ship liner-free for easier handling, while the 3040BK sizes (6", 9", 12") include a liner. Both use the same acrylic adhesive formula.
How much G-Tape do I need for my deck?Measure the total linear footage of joists, beams, and ledger boards you're covering, then add roughly 5-10% for overlaps and waste. Each roll covers 65 linear feet.
Is joist tape necessary, or is it optional?Joist tape isn't code-required in most jurisdictions, but it's widely recommended by decking manufacturers (including Trex and TimberTech) to protect the top of joists from standing water — the leading cause of premature joist rot.
Does G-Tape work in cold climates?Yes — G-Tape is rated to bond and perform in temperatures as low as -40°F, making it suitable for winter installation and cold-weather regions.
How is G-Tape different from butyl deck tape?Butyl tapes are thicker, messier to handle, and tend to stick to themselves in the roll. G-Tape's acrylic formula tears cleanly by hand, repositions without residue, and doesn't self-adhere in storage.
Composite decking stands apart from wood thanks to features that make it easier to own and maintain.
Enjoy long-term durability that outperforms traditional wood decking.
Choose from a wide range of colors to create a look that’s uniquely yours.
Built with advanced materials that resist rot, moisture, and warping.
With simple, occasional cleaning, your deck stays looking clean and polished
Your deck starts with a great plan. Use our decking design tool to explore layouts, materials, and finishes in a realistic, easy-to-use experience. See what’s possible and move forward with confidence—no surprises, just better builds.
Great – we love ‘em. Our team of experts has plenty of experience with tailoring a customized project. Talk to one of our associates on the floor, give us a call, or drop us a line to get started.
For Small Boxed Items:We offer a 1-2 day turnaround for small boxed items and a tracking number will be provided to keep you updated on the status of your delivery.
For LTL Freight (Common Carrier) Items:We use LTL freight for safe and efficient delivery. Your order will be scheduled for delivery, and it's important to note that for decking deliveries, a homeowner needs to be on hand to unload the product. This ensures a smooth and hassle-free delivery process. Rest assured, we're here to make the process as convenient as possible for you.
If you need it, we’ll get it! As your one-stop deck shop, you’ll find everything at your fingertips, or we’ll get it shipped out to you anywhere in the continental U.S.
The Deck Store takes the guesswork out of pulling your project together. Stop by our local retail store in Knoxville, or enjoy hassle-free online ordering.
Our customers are our #1 priority, and we’re dedicated to bringing you quality decking supplies. Our customer promise is to carry the highest quality products, so you can enjoy your deck or dock for years to come with minimal maintenance.
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