Imus Cap is a patented, easy to install joist and beam cap designed to protect your wooden deck structure from water damage and rot. Imus Cap is made of bonderized metal with Imus Flex pressure-sensitive butyl rubber waterproof 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||✅||✅|
Imus Cap was invented by a contractor and is the joist cap trusted by building professionals and homeowners to extend the life of deck structures.
|Width (inside):||1 5/8 in.||3 5/8 in.|
|Weight:||1.8 lbs.||3.6 lbs.|
|Composition:||26 gauge bonderized metal with Imus Flex 62.5 mil butyl rubber membrane and a release liner|
|Packaging:||Packaged with red end caps for safety and convenience|
|Made in the U.S.A. 🇺🇸|
Imus Cap is simple to install.
1. Cut to length
3. Stick to joist or beam
Your deck structure is now protected.
"Imus Cap protects joists and beams from moisture with a paintable metal top layer and a waterproof adhesive"
Is Imus Cap compatible with my deck surface material?
Yes, Imus Cap 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).
Will Imus Cap corrode when in contact with treated wood?
No. Imus Cap is made of bonderized steel, also referred to as paint grip steel, which is G90 hot-dip galvanized steel that has been put through a phosphate bath and a chromate dry. Bonderized metal withstands corrosive chemicals commonly used in pressure-treated lumber like alkaline copper quaternary (ACQ) and copper azole (CA).
How is water kept from entering the joists where the deck fastening screws penetrate the metal cap?
Imus Flex self-adhered butyl rubber flashing membrane seals around fasteners.
Are self-tapping screws required for installation?
No, standard decking screws can penetrate 26 gauge metal. A demonstration video is in this blog post.
Should Imus Cap be overlapped or butt together?
We recommend butting pieces together (butyl membrane will fill gaps when being fastened down). Overlapping could result in uneven decking surfaces.
Can Imus Cap be used to protect wood structures other than decks from rot?
Yes, Imus Cap can be used on stair stringers, trellises, pergolas, exposed exterior beams, and more.
Can I calculate how many lineal feet of Imus Cap my deck needs?
Yes, you can calculate your deck square footage and estimate how much Imus Cap it will need with the Deck Size and Protection Calculator.
Happy with the product
I had to tear off the old cedar decking from my deck. As the joists are also cedar some had some surface rot and are full of old nail holes. Still structurally sound but would have continued to deteriorate without placing the Imus Caps over them. Hopefully I've extended the life of my deck joists for another 30 years.
Thanks for developing this product! It was easy to install and cut.
It will be a great addition to my business and customers need this!
I bought one stick in order to protect a cantilevered ledger board that is part of my aluminum/vinyl pergola (Heartland Pergolas). The 2 x 8 beam extends out about 3 ft from the house corner and therefore is not flashed. I used the cap to provide protection for this one wood piece on the pergola. I painted it to match and it looks great. The good thing is that this board should now last the life of the pergola since it won't have rain and snow soaking into the board. If I had done a wood pergola, this product would have been perfect protection for all the joists, which was the point of failure on the previous wood one. I wish I had known about it (if it existed) 20 years ago when we had our deck redone.
Easy online ordering and payment, rapid delivery, and quick install of Imus Cap on a small balcony deck. One more balcony deck to refurbish, I will install Imus Cap on it. I wish I knew about Imus Cap several years ago, I would have used it on a new deck joists installed at my home.