DryJoist FAQs

How does DryJoist differ from other waterproof decking products?

DryJoist is not a waterproof decking product – it’s a structural deck drainage system. DryJoist provides the necessary structural support every 4” compared to traditional 12” or 16” o.c. for many different types and brands of deck boards whatever they may be – unlimited decking material options, patterns/designs is the same system that creates a dry area below the deck.

Up to date, builders wishing to provide waterproof decks have attached additional gutter systems to the underside of the frame exposes supporting beams to a moist environment, used contemporary deck boards such as aluminum modern style, or layered wooden joists with water resistant membranes time intensive & pricey. DryJoist’s structural design is a single systemstructural design creates 100% waterproof area below ie: waterproof deck joists that provides the necessary utility of traditional deck joists yet provides the freedom to build a truly custom deck surface that is both waterproof and independent from the constraints of wooden joist spans or waterproof ‘add-on’ substructures.

What colors are available? Can I paint DryJoist?

The only visible side or ‘Face’ of DryJoist comes standard in a White color, powder-coat finish. Yes, DryJoist is paintable; you’re local home center should be able to suggest an exterior paint for use on aluminum. If you decide to paint, make sure you paint after DryJoist has been installed to prevent paint build-up in the Flange Receiver. enjoy & get creative

What types of applications can DryJoist be used for?

DryJoist can be installed by the professional deck builder or DIY homeowner to build, refurbish or remodel a multitude of outdoor structures such as a backyard deck, second story balcony, patio, porch, roof deck, pool deck, walkout carport or garage deck.

DryJoist is a simple and single system; it is the first to provide both structural support for the deck’s surface boards while creating a 100% dry living space below. Other applications include landscape architecture such as water harvesting, or even a deck cover for outdoor kitchens.

Where can I purchase DryJoist?

All of Wahoo Decks’ products can be purchased via special order from your local lumber yard or home center.

When you have the dimensions or drawing of your upcoming project, take them to your local lumber yard or home center and ask them to special order our products for you.

Or if you’d prefer, give our Wahoo Decks Team a call at:
Toll Free: 877.270.9387
Phone: 678.343.2317

You can even send us a fax at 678.343.2916

Is DryJoist environmentally friendly?

Yes. DryJoist is manufactured using 45% recycled content from industrial and post-consumer aluminum scrap. DryJoist also harvests rainwater, reducing pollution from stormwater runoff. Because of the recycled content and the stormwater management, this product assists builders in achieving points toward LEED credits based on the standards set forth by the LEED Green Building Rating System within the categories of Recycled Content of Materials, Construction Waste Management and Stormwater Design.

LEED Credits: MR Credit2.1, MR Credit 2.2, MR Credit 4.1, MR Credit 4.2, SS Credit 6.1

What composites or PVC deck surface boards can I use with the DryJoist & DryJoistEZ systems?

Wahoo recommends that you refer to the installation guidelines of the decking you plan on using on your project. You’ll be looking for a section that references minimum clearance for sleeper systems. This minimum clearance needs to be 2″ or less as that is the profile height of DryJoist and DryJoistEZ.

Listed below are deck boards currently on the market that have 2″ or less stated in their installation guidelines for a minimum clearance for installation on sleeper systems.

If you do not see the deck board you’re interested in listed below, it does not necessarily mean it’s not a good fit with our system….with the ever-changing landscape of decking manufacturers, it’s just too hard to keep up. Wahoo suggests contacting the manufacturer and ask them what their recommendation is for a minimum clearance when using the decking on an aluminum sleeper system that is pitched for drainage and does not soak up moisture like wood framing does.

  • Azek Decking
  • TimberTech(r) XLM(r)
  • TimberTech Earthwood Evolutions ™
  • TimberTech TwinFinish(r)
  • TimberTech Reliaboard(r)
  • TimberTech Docksider(tm)
  • Tamko(r) Evergrain(r) Decking
My deck frame was built using ACQ (Alkaline Copper Quaternary) pressure treated wood, is it compatible with DryJoist?

Yes, DryJoist was designed to be compatible with ACQ treated lumber. It is produced with a barrier coating (a special powder-coat paint applied at the mill) to prevent ACQ contact with the bare aluminum. As a matter of fact, an aluminum decking product we manufacture called Ariddek has been used with ACQ since this lumber treatment was introduced a few years ago and can be found on some of the country’s most pretigious boat dock systems. www.WahooDocks.com

Other building products that are not compatible with ACQ recommend simply adding a felt paper or PVC barrier (sheets or strips) to prevent contact with ACQ treated lumber. The point here is that it is not difficult to use other standard metal components such as uncoated aluminum or uncoated steel while ACQ is still the standard pressure treatment for lumber.

Decking fastener manufacturers understand the issues with ACQ and have development stainless steel, coated steel and electroplated screw fasteners specifically for use with ACQ.

ACQ will soon be replaced with another treatment that is friendly to standard building materials such a aluminum, steel and steel coatings. There are mills and manufacturers that already produce and sell non-ACQ treated lumber. More can be read about these new treatments and products in web articles on the same subject.

Do I need special tools to install DryJoist?

No. DryJoist can be installed with a minimum number of readily available tools. No special tools are necessary for installation.

Do I have to pitch DryJoist?

Yes, we suggest approximately 1/8” downward pitch per foot (away from the house). This is a minimal pitch that will not be visible to the naked eye, but provides a generous slope for water to drain away from the structure. The 2”x2” Water Channel provides ample drainage and is capable of handling heavy rainfall.

What type of decking can I install on DryJoist? Are there limitations?

DryJoist provides ultimate appearance flexibility with no limitations to your deck board options: composites, hardwoods, softwoods, etc. and decking patterns/designs: angled, picture frame, parquet, etc.

DryJoist provides structural support every 4” to accommodate for your choice of surface boards which can be fastened at either 8” / 16” / 24” on-center.

Is the DryJoist structural deck drainage system compliant with local building codes and the International Building Code?

Yes. DryJoist meets or exceeds the specifications and guidelines for aluminum structures as recommended by AA ADM 1 and required by the International Building Code – 2006.

Building Code Requirements – International Building Code – 2006

CHAPTER 16 – STRUCTURAL DESIGN
SECTION 1604 GENERAL DESIGN REQUIREMENTS
1604.3.5 Aluminum. The deflection of aluminum structural members shall not exceed that permitted by AA ADM1.
CHAPTER 20 – ALUMINUM
SECTION 2002 MATERIALS
2002.1 General. Aluminum used for structural purposes in buildings and structures shall comply with AA ASM 35 and AA ADM 1. The nominal loads shall be the minimum design
loads required by Chapter 16.
AA ASM 35
Aluminum Sheet Metal Work in Building Construction (Fourth Edition):
SCOPE: These specifications shall apply to the proper use of aluminum in roofing, flashing and other sheet metal work in building construction. They are not intended to cover the details or specifications of proprietary or pre-formed sheet metal systems or products, such as horizontal siding, fascia and soffit systems, curtain wall systems, corrugated or ribbed roofing and siding, etc.
(NOT APPLICABLE TO DRYJOIST AS THE SYSTEM IS STRUCTURAL)
AA ADM 1
Aluminum Design Manual: Part 1-A Aluminum Structures, Allowable Stress Design; and Part 1-B – Aluminum Structures, Load and Resistance Factor Design of Buildings and Similar Type Structures
SCOPE: The Aluminum Design Manual includes aluminum structural design specifications and accompanying commentary, a supplemental design guide, material properties, section properties, design aid tables and graphs, illustrative design examples and guidelines for aluminum sheet metal work in building construction.

(DRYJOIST MEETS OR EXCEEDS THE SPECIFICATIONS AND GUIDELINES FOR ALUMINUM STRUCTURES AS RECOMMENDED BY AA ADM 1 AND REQUIRED BY THE INTERNATIONAL BUILDING CODE – 2009)

Can I cantilever DryJoist? Is there a suggested overhang?

Yes, the maximum allowable edge cantilever for DryJoist is 18”&.

A 2” overhang beyond the header joist on the drainage side is suggested to shield the joists from backsplash due to heavy downpour and ease optional gutter installation. Visit the Interactive Deck Workshop for Project Ideas on Water Harvesting.

Can I use hidden fasteners when installing my deck boards on DryJoist?

Yes. Follow the manufacturer’s guidelines for the correct hidden fastener method when installing your decking boards.

What type of blade should I use to cut DryJoist?

It is recommended to use either a miter or circular (skill) saw with a carbide blade: 12” blade – 96 teeth / 10” blade – 80 teeth / 7 ¼” blade – 62 teeth. Saw blades with fewer teeth stay cooler, last longer and are typically easier to use.

Do I have to install gutters or downspouts?

Installing gutters or downspouts are not required although they can be installed if you would like to incorporate your deck with your landscape architecture and design.

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