Waterproof Deck Systems (DryJoist) FAQ’s:
How does DryJoist differ from other waterproof deck systems?
DryJoist is a structural deck drainage system; this means that along with being 100% waterproof, it also replaces the conventional deck joist system you would traditionally use to build your deck.
Other waterproof deck systems on the market are either membrane systems or “under decking” type systems that are installed below your deck joists. Both of those waterproof deck systems come with highly labor-intensive installation processes and are only effective for limited amounts of time.
The component materials used in the DryJoist system are extruded from marine-grade aluminum, which makes them very rigid and extremely durable. When the DryJoist system is installed, it provides a solid waterproof structure that will never leak. Additionally, DryJoist is mounted on top of your deck frame, which extends the life of framing materials.
What types of applications can DryJoist be used for?
DryJoist can be installed by a professional deck builder or the DIY homeowner. DryJoist can be used to build, refurbish or remodel a multitude of outdoor structures such as a:
- Backyard deck
- Second story balcony
- Patio or Porch
- Roof deck or Pool deck
- Walkout carport
- Garage deck
DryJoist is a simple and single structural deck waterproofing system. It is also the first of it’s kind decking system to provide both structural support for the deck’s surface boards, while creating a 100% dry living space below deck. Other applications include landscape architecture such as water harvesting or even a deck cover for outdoor kitchens.
What type of deck boards can I use with DryJoist?
DryJoist provides the ultimate flexibility, with no limitations when it comes to your deck surface options. Obviously we would love you to install our capped composite decking boards onto DryJoist however your choices are almost limitless. In essence, DryJoist has support every 100 to 150mm which allows you to fasten your deck boards every 100/150/200/250/300mm.
Is DryJoist environmentally friendly?
Yes. DryJoist is manufactured using 45% recycled content from industrial and post-consumer aluminium scrap. DryJoist also harvests rainwater—reducing pollution from stormwater runoff. Because of the recycled content and the stormwater management, DryJoist is an environmentally-friendly decking product. As such, this product also assists builders in achieving points toward LEED credits based on the standards set forth by the LEED Green Building Rating System.
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 a 1 in 100 downward pitch (away from the house). This is a minimal pitch that will not be visible to the naked eye, yet provides a generous slope for water to drain away from the structure.
Is the DryJoist structural deck drainage system compliant with local building codes and the International Building Code?
Yes. DryJoist meets or exceeds deck building code specifications and guidelines for aluminium structures, as recommended by International Building Codes.
Can I cantilever DryJoist? Is there a suggested overhang?
Yes, the maximum allowable edge cantilever for DryJoist is 300mm. A 50mm 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.
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 preferred decking surface boards.
What type of blade should I use to cut DryJoist?
It is recommended to use either a mitre or circular (skill) saw with a carbide blade: 300mm blade – 96 teeth / 250mm blade – 80 teeth / 180mm 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 downpipes?
Installing gutters or downpipes is not required, although they can be installed if you would like to incorporate your deck with your landscape architecture and design.