Features . . . Benefits, Warranty. . . Why Choose Vinyl Rather Than Aluminum

UnderDeck The Original. An attractive deck drainage system for elevated decks.

UnderDeck The Original® is a patented innovative outdoor ceiling system designed to solve the problem of what to do with the wet, dark, ugly space below second-level decks caused by rain. It’s a great deck drainage system that has a distinct dimensional design which hides minor imperfections in joist heights, and is much more attractive than those flat, shiny surfaces other systems employ. UnderDeck solved the problem by creating a unique, functional, and beautiful solution. What makes UnderDeck The Original ceiling system so innovative is its simple and efficient use of vinyl gutters and panels which attach to the joists below the deck. It captures and diverts the water and dirt that falls through the gaps in your deck and the water and dirt travels onto the UnderDeck’s System and exits at the end of the deck, or is channeled through rain gutters and downspouts to direct the flow of water away from your home.

So no matter if you simply want to enjoy a restful snooze lounging outdoors, send the kids to play outside, host a friendly neighborhood Bar-B-Que, or perhaps enjoy your outdoor hot tub, there will be no concern that a little rain might disrupt the activity.

UnderDeck The Original has an added benefit – the UnderDeck Gutters and Collector Panels can be easily removed and reinstalled to provide for access above the system. If you want to add accessories like ceiling lights or fans, you can it at any time!

UnderDeck won the 2007 Building Products Top 100 Products Award!

The Building Products Top 100 award is an editorial award recognizing the 100 products that generated the most inquiries in 2007. UnderDeck’s product was chosen from thousands of editorial product mentions which ran in BUILDER, REMODELING, CUSTOM HOME and BUILDING PRODUCTS Magazines in 2006. The Building Products Top 100 award is one of the industry’s most prestigious, because the recognition comes from the builders and remodelers themselves!

Why Buy UnderDeck?

  • It’s beautiful and functional
  • Backed by a 15 Year Limited Warranty
  • UnderDeck The Original can be installed on existing or new deck construction
  • Removable panels allow for easy access
  • Colorfast all the way through — you may stain your deck above without having to remove UnderDeck
  • Easy to clean with mild soap and water.
  • Made from exterior grade PVC — it’s not affected by treated lumber like aluminum is
  • Won’t fade, mold, rust
  • Can be installed on various sized joist cavities — from 12 to 24 inches
  • No lost head room like some of the competitors products
  • Can be custom cut around vents on ledger board so you don’t lose access to cleaning out vents that get covered up by the other systems
  • No need to add fascia (face boards) to the outside of the deck to cover up the pitch like some competitors systems
  • Can be installed by a handy do-it-yourselfer or a general contractor
  • Order exactly what you need — no need to order kits or carton quantities

UnderDeck Warranty


FehrMark, Inc. provides a Limited 15 Year Warranty on UnderDeck PVC outdoor ceiling when installed in compliance with UnderDeck printed installation instructions. This warranty extends to the original homeowner (Purchaser), for as long as they own and occupy the residence upon which the outdoor ceiling materials are installed. UnderDeck PVC outdoor ceiling is warranted to be free from defects in workmanship and materials, and will not split, splinter, flake, chalk, rot, deteriorate or suffer structural damage from termites or fungal decay.

FehrMark, Inc. does not warrant against and is not responsible for, and no implied warranty shall be deemed to cover, any product failure, product malfunction, or damages attributable to: improper installation of UnderDeck outdoor ceiling and/or failure to comply with printed installation instructions; use of UnderDeck outdoor ceiling in an application not recommended by FehrMark, Inc. and/or all local building codes; problems resulting from defects in or failure of the supporting structure on which UnderDeck outdoor ceiling is installed; any act of God (such as flooding, hurricane, earthquake, tornado, or other violent casualty); ordinary wear and tear; or improper handling, storage, misuse or neglect of UnderDeck outdoor ceiling.

It is a condition of this warranty that should your UnderDeck outdoor ceiling show defects; you must notify FehrMark, Inc. in writing within 30 days of discovering the claimed defect and prior to beginning any repair or alteration to your deck. The notice must include a detailed description of the claimed defect, with supporting photograph(s), the date of installation of the UnderDeck outdoor ceiling, and proof of purchase. FehrMark, Inc. representatives must be permitted to inspect the claimed defect as a condition of this warranty. After reviewing all information, FehrMark, Inc. will make a determination regarding the validity of the claim. If FehrMark, Inc. determines that the claim is in accordance with the terms of this Limited 15 Year Warranty, FehrMark, Inc. will provide the necessary product materials to repair or replace defective UnderDeck The Original products. This warranty will not cover, and FehrMark, Inc. will not be responsible for, costs and expenses incurred for removal of the defective outdoor ceiling or the installation of the replacement materials. Replacement outdoor ceiling material will be provided that is as close as possible in color to the original installation, but we do not guarantee an exact match.

Under no circumstances will FehrMark, Inc. be liable for special, incidental or consequential damages. Liability with respect to UnderDeck outdoor ceiling shall in no event exceed the cost of replacement product. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation may not apply to you. These warranties give you specific legal rights. You may also have other rights, which vary, from state to state.

All implied warranties with the respect to this product (including merchantability) are limited to 15 years from the date of purchase.

This warranty shall only be applicable in the United States of America and Canada.

Frequently Asked Questions

What is an UnderDeck The Original outdoor ceiling?

UnderDeck The Original is an attractive and easy-maintenance vinyl outdoor ceiling system that attaches to the underside of your second level deck. It transforms the area under your open deck into a dry, bright, clean area that family and friends can enjoy for years to come. UnderDeck’s exterior grade vinyl is a minimum of 42 mil thick and is treated with UV additives, offering durability and a beautiful UnderDeck ceiling.

How much does the UnderDeck system cost?

The cost of the UnderDeck The Original outdoor ceiling system will depend on the specific size of the deck, the joist spacing and the overall shape of the area to be covered. To obtain an exact quote for materials only, we will need some specific information about your deck. After taking a few measurements and counting joists and spaces, plus taking a few photos of your under deck, you’ll be able to fill out our Online Estimator. If you have any questions, please call us at 1.888.353.3347.

What is the UnderDeck warranty?

UnderDeck carries a 15 year limited warranty covering all UnderDeck components and its patented interlocking parts. You may download the complete warranty here.

Does UnderDeck only work with 16 in. joist spacing?

UnderDeck The Original is a flexible and customizable product that will work with joist spaces ranging from 12 to 24 in. on center.

What colors are available?

UnderDeck is available in a light-textured matte white or tan finish.

Can the ceiling be cleaned, and what happens to the debris?

Our ceiling and gutter system is very accessible to the homeowner. When debris enters the system through the gaps in the deck boards, it slides down the Collector Panels and into the gutters and is discharged. A correctly installed system allows the water and debris to self clean. If, for some unforeseen reason the system does clog, you can flush the system from the top with a garden hose, or you can easily remove and reinstall UnderDeck’s Gutters and Collector Panels from below if required.

Can the ceiling panels be easily removed?

Yes! It’s an important feature many other products can not offer without risk of marring or damage. You may remove the UnderDeck Gutters and Collector Panels with ease for deck repairs, or to add lighting features, fans, electric lines, etc. It is just as easily re-installed when your work is complete.

Can I add ceiling fans, lights and porch swings under my ceiling?

Absolutely! Because our system unlocks and locks back together, you can always get into the system to add wiring, etc. for any modifications above.

Is UnderDeck The Original affected by freezing temperatures?

If the system is installed properly, any water that makes its way to the gutters is evacuated in a mater of seconds, and no water will remain to freeze.

Will chemical wood stains or treatments damage UnderDeck?

Staining or painting the deck above will not affect UnderDeck The Original. If you prefer, you can always take the components down and re-install them after your maintenance is complete. However, the UnderDeck surface will stain if the exposed side is splashed.

Can I paint the UnderDeck if I want a different color?

Yes, you can paint UnderDeck The Original. Your local home supply store can direct you to the proper primer and paint to use on vinyl.

Should I use gutters and down spouts at the end of the Joist Gutters?

Rain gutters and downspouts are not necessary, however, most applications do utilize them to provide a controlled manner to disperse water.

Will the UnderDeck system reduce the head room under my deck?

UnderDeck fits up into the joist space of your existing deck. The lowest portion of the gutters hang down approximately 2 in.

Must an UnderDeck The Original outdoor ceiling be installed by a professional contractor?

No. This product is specifically designed to be an easy-to-install project, and should be as easy for a Do-It-Yourself homeowner as it is for a qualified contractor. Not sure if you want to attempt the installation? Read the Installation Guidelines located under the Installation Tab of this website to fully understand all the details of the installation. You can download the pdf and print out instructions to use at the job site and review our detailed drawings for special conditions.

How long will my installation take?

It depends on the size of the deck. However, it should take around 5 hours on a typical 12 ft. x 12 ft. deck (144 sq. ft) . Normal installations are estimated at 50 square feet per hour per two person crew.

Where can I get UnderDeck The Original ceiling system?

You are able to purchase the UnderDeck system directly through FehrMark, Inc. or from a number of different sources as a Special Order product. It is available through UnderDeck, www.DIYHomecenter.com, or at select dealers. Click here to find the dealer closest to you.

I want to install UnderDeck myself. How do I order the required system components?

Simply fill out our online Estimator, and and add a few deck photos and a drawing if you can. If you have questions, either call us or use our contact form. After we receive your submission, we’ll provide a cost estimate within days.

How soon can I get UnderDeck?

Most orders deliver in 5-7 days. If you require faster delivery, please contact our office at 1-888-353-3347 and we will do our best to accommodate you.

If I need installation help or have technical questions, who do I call?

Call toll free to Customer Service at 888.353.3347. We can handle all your questions and provide answers promptly. (Monday to Friday 8 am to 5 pm EST).

Can the UnderDeck System be attached to my existing deck?

Yes. UnderDeck is easily installed onto any new or existing deck.

How does UnderDeck perform in extreme cold, ice and snow?

UnderDeck is an exterior grade PVC material so it handles the freeze and thaw process very well. The snow that melts between your deck boards will actually drain out of the system before it can freeze.

Competitor Comparison

UnderDeck The Original®

100% removable for access to cleaning or any other reason. Non-removable or are very, very difficult to remove without bending or marring surfaces.
Custom fit right around vents. No access to clean any vents or fresh air returns because the aluminum systems drop below the ledger board.
Easy to cut. Harder to cut, with concern for sharp aluminum edge cuts.
No need to add fascia boards to cover up the pitch. Need to add fascia boards to the outside edges of your deck so you don’t see the aluminum hanging down from the sides.
Water does not freeze on UnderDeck and will exit the system. Water freezes immediately on cold aluminum, so water doesn’t have a chance to exit the system before it freezes and can cause ice concerns.
Designed for homeowners to easily install the system themselves. Most aluminum systems are not Do-It-Yourself (DIY). They need to be installed by contractors.
Does not dent or scratch easily. Dents and scratches very easily.
You won’t lose more than a couple inches of headroom using UnderDeck. You will lose 8 inches to one foot of head room with aluminum systems.
UnderDeck will never rust, fade or mold. Will not rot out pressure treated wood. Will rot out pressure treated wood over time.
Water does not sit in the system. Water will sit in the system.