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Imus Seal

Imus Seal is a self-adhering butyl joist and beam tape designed to protect your wooden deck structure from water damage and rot.

Deck Size and Protection Calculator


Imus Seal is one of our solutions to Protect your deck structure™.

Imus Cap logo Imus Seal logo
Imus Cap Imus Seal 1-5/8 inch Butyl Adhesive
26 gauge bonderized metal
62.5 mil butyl membrane
Multi-layer laminate HDPE film
12 mil butyl membrane
Diverts Water from Joists and Beams
Seals Decking Screws
Easy to Install
Provides a Barrier Between Metal and Wood
Protects Treated and Non-Treated Lumber
1-5/8”: $1.87/ft.
3-5/8”: $3.12/ft.
1-5/8”: $0.40/ft.
4”: $0.72/ft.
6”: $1.00/ft.
Learn more



Imus Seal logo

Want to prevent deck rot? Protect your deck structure™ with Imus Seal.

Imus Seal is the premium joist tape trusted by building professionals and homeowners to extend the life of deck structures.

  • Imus Seal diverts water away from your joists and beams.
    Strong and flexible multi-layer laminate high-density polyethylene (HDPE) backing allows for tear resistance while being able to form to fasteners and corners.
  • Imus Seal seals your decking screws.
    Pressure-sensitive 12 mil butyl waterproof membrane, containing no asphalt or VOCs, self-seals around nail and fastener penetrations.
  • Imus Seal 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 between metal and wood creates a barrier to prevent contact.
  • Imus Seal protects treated and non-treated lumber.
    Compatible with all deck materials including pressure-treated wood and composite products.
  • Imus Seal meets AAMA 711 performance standards.




Size: 1-5/8” x 50’ Roll 4” x 50’ Roll 6” x 50’ Roll
Imus Seal 1-5/8 inch Imus Seal 4 inch Imus Seal 6 inch
UPC: 867442000339 867442000353 867442000360
Width: 1 5/8 in. 4 in. 6 in.
Length: 50 ft.
Thickness: 0.020 in.
Weight: 1.4 lbs. 3.4 lbs. 5.4 lbs.
Composition: Multi-layer laminate HDPE film with a 12 mil butyl adhesive and a split release liner
Application Temperature: 20° F to 180° F
Made in the U.S.A. 🇺🇸






Imus Seal Press

"Designed to protect deck joists and beams, the 50-foot rolls are available in 1 5/8-inch, 4-inch, and 6-inch widths, for $17, $35, and $50, respectively."

JLC Online

"Imus Seal is a self-adhering 20-mil thick flashing tape that can be applied in temperatures ranging from 20 degrees to 180 degrees F."

Professional Deck Builder magazine



Imus Seal on Social



Frequently Asked Questions & Answers

Is Imus Seal compatible with my deck surface material?
Yes, Imus Seal 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 be used to protect wood structures other than decks from rot?
Yes, Imus Seal can be used on stair stringers, trellises, pergolas, exposed exterior beams, boat docks, and more. Imus Seal can also be applied to ledger boards and used to wrap deck posts.

Are there retailers that stock Imus Seal?
Yes, here is a map of our retail partners. Imus Seal is also available on Amazon and eBay.

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



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Customer Reviews

Based on 27 reviews
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.

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,

Anazing sticking power

I used Imus Seal to cover my 30+ year old pressure treated joists before installing Trex. I'm confident that the joists will last the life of the Trex because of the amazing sticking and sealing ability of the seal.

Imus seal

Great sealing tape ! Costly but very good .

I like the joists caps.

Recently I installed joist covers on a small deck. They work well. I will use them when I rebuild my much larger deck.