Imus Seal Butyl Joist Tape

Imus Seal Butyl Joist Tape is a self-adhering flashing tape for joists and beams designed to protect wooden deck structures from water damage and rot.




Imus Seal logo

Want to prevent deck rot? Protect your deck structure with Imus Seal Butyl Joist Tape.

Imus Seal Butyl Joist Tape is the premium joist tape trusted by building professionals, homeowners, and DIYers to help extend the life of deck structures.

  • Diverts Water from Joists and Beams
    Strong and flexible synthetic black facer allows for tear resistance while being able to form to fasteners and corners.
  • Seals Decking Screws
    Pressure-sensitive 20 mil butyl waterproof membrane, containing no asphalt or VOCs, self-seals around nail and fastener penetrations.
  • Provides a Barrier Between Metal and Wood
    Corrosive chemicals like alkaline copper quaternary (ACQ) and copper azole (CA), commonly used in pressure-treated wood, can corrode steel joist hangers and other metal hardware. Installing Imus Seal Butyl Joist Tape between metal and wood creates a barrier to prevent contact.
  • Protects Treated and Non-Treated Lumber
    Compatible with deck materials including pressure-treated wood and composite products.




Size: 1-5/8” x 50’ Roll 4” x 50’ Roll 6” x 50’ Roll
Imus Seal Butyl Joist Tape 1-5/8 inch Imus Seal Butyl Joist Tape 4 inch Imus Seal Butyl Joist Tape 6 inch
UPC: 850014028008 850014028015 850014028022
Width: 1 5/8 in. 4 in. 6 in.
Length: 50 ft.
Thickness: 0.02 in.
Weight: 1.4 lbs. 3.4 lbs. 5.4 lbs.
Composition: 20 mil butyl adhesive coated to a synthetic black facer with a tear resistant release liner
Application Temperature: 30° F to 120° F
Service Temperature: 0° F to 180° F
Made in the U.S.A. 🇺🇸







Is Imus Seal Butyl Joist Tape compatible with my deck surface material?
Yes, Imus Seal Butyl Joist Tape works with naturally durable wood (e.g. redwood, cedar), pressure treated timber (e.g. southern yellow pine), exotic tropical hardwoods (e.g. ipe, teak, tigerwood), thermally modified wood, wood plastic composite (e.g. Trex, Monarch, TimberTech, Veranda), or plastic (e.g. polystyrene, PVC).

How is water kept from entering the joists where the deck fastening screws penetrate the tape?
The self-adhered butyl rubber flashing membrane seals around fasteners.

Can Imus Seal Butyl Joist Tape be used on more than just deck joists or beams?
Yes, Imus Seal Butyl Joist Tape can be used on ledger boards, stair stringers, posts, boat docks, and more. Avoid prolonged exposure to sunlight, Imus Seal Butyl Joist Tape is not UV resistant. If a UV resistant tape is required, check out Imus Seal Butyl Roof Tape.

Are there retailers that stock Imus Seal Butyl Joist Tape?
Yes, Imus Seal Butyl Joist Tape is available on Amazon.

Can I calculate how many lineal feet of Imus Seal Butyl Joist Tape my deck needs?
Yes, you can calculate your deck square footage and estimate how much Imus Seal Butyl Joist Tape it will need with the Deck Size and Protection Calculator.







Customer Reviews

Based on 27 reviews
Mark S.

Great product. Do yourself a favor, don't build a deck without Imus products.

Greg Smith

The joist tape exceeded my expectations. It was easy to apply. It even stuck to damp wood. This tape really made the deck sound solid when walking on it. Will use this on all future deck projects.

Don White

I’m using this tape as I replace deteriorated deck boards on my 25-year old cedar deck. Prior to Imus Seal I’d used the silver window seal tape, but A. Because of its width, wasted a lot of tape on the 2 by joists , and B. The silver was visible and unattractive to see through the gaps in the deck boards. Imus Seal is exactly the right width and is basically invisible between the boards. It’s also very easy to apply.

Darrell Willhite

Imus Seal

Craig Jester
2000 Square Foot Deck Resurface with Trex using Imus Seal

The project involved resurfacing a 2000 square foot deck adjacent to and surrounding a pool. The deck was over 30 years old and had been built in stages, none to code. After removing the cedar planking some joists and all of the posts needed replacing. One comcern was that the joist tops were compromised from removing nails and screws with the old decking. We knew joist tape was the answer and tried three vendors before deciding on Imus. Quite simply it stuck like bubble gum, the backing came off effortlessly, and the price and service were excellent. As a note, the cedar planking is being planed, stained, and reused as the fascia for the project. Pictures include two fox pups that were quite interested in our project. I'll add a picture or two when completed.

Great joist tape for deck projects

While researching DIY deck construction methods it became clear that adding a joist tape would prolong the life of the substructure. Imus Seal is an easy to use product that fits with the perfect amount of overlap on the joist.

David Thompson
Excellent Product

Ordered both 1-58" and 4" Joist Tape. Adhesive is very tacky and adheres very well. Texted for shipping info before purchasing and got immediate reply. I am very pleased with product and service.

Bob Simpson
Pricey but worth the investment

I found the tape to be very good and it makes a huge difference in the sound . Careful how you handle it, very sticky,