ACCOYA

Build with Grad systems 

Better decking and siding start with a better installation system.


For more than 20 years, Grad has developed innovative hidden fastening systems designed to make wood decking easier to install, more durable and beautifully finished.

What is Accoya?

Accoya wood is an ultra high performance wood. Compared to traditional wood species, it is incredibly durable, stable, and sustainable. It is primarily made from sustainably sourced Radiata pine and undergoes a proprietary wood modification process known as acetylation.

 

Product guarantee: up to 50 years. 

Accoya Natural

Accoya Grey

Stained, Natural, or Charred: choose your finished color and style

Standard Profiles

accoya deck

Grad installation systems

3 SYSTEMS FOR ALL PROJECTS

grad cladding interior
kebony wood
Mini rails for siding
or for soffits
star rail siding grad
star rails floor
Star rails for siding
or for decking
grad deck system pedestal
Joists on pedestals for decks

HOW IT WORKS

Click-on boards and battens and hidden fastener systems from Grad

Faster to install, versatile, flexible, more precise, perfect spacing, easy learning curve, no previous product experience necessary, reduced labor costs and durable installations with a 20-year warranty

mini rail grad
Mini Rail
mini rail grad siding kebony
Installation
mini rail grad siding kebony
Boards are pushed onto the clips: no face screws
grad pedestal deck system
Grad structural joists on Grad pedestals
GRAD DECK PEDESTAL
Installation
grad deck system accoya
Boards assembly: press and click

Why build with Grad?

SAVE TIME, SAVE LABOR, MAKE MORE

Idiot-proof system that does not require high-skilled labor and years of experience in the trade to use it well. 

Every clip is already pre-fastened: there is no need to fasten one clip at a time anymore, fastening 1 rail = fastening 6ft length of clips under 30 seconds!

— all rails are built the same: same aluminum and same clips from one rail system to the other

— all rails are used for every purpose: decks, soffits, siding so you quickly become a master at it

— a traditional 200 ft² deck at 16” OC will require approximately 700 clips to be fastened with 400 screws, whereas the same deck with Grad will require no more than 110 screws to fasten rails

— no need to double check gaps between boards are even or that boards are well aligned: once boards are snapped onto our clips you can be ensured everything is perfect first time and installation time is halved!

— Start Rails are wider than joists and can protect them better to keep them away from water: less need for joist tape.

— Grad® rails are light, easy to carry and often cheaper to ship than PT

 

It’s not a competition! but projects are usually completed faster . Some reports suggest that 1 individual can lay 3,000 SF of siding per day. 

Grad’s hidden fastening system secures both decking and siding without visible screws or fasteners, leaving the material clean and uninterrupted. The system uses precision-engineered aluminum rails fitted with discreet clips that work like mini harpoons: simply push the board against the clips and their specially designed teeth grip and hold the material securely in place. The result is a fast, precise installation with consistent spacing, excellent ventilation and a refined finish that lets the natural beauty of the wood take center stage.

Grad systems are engineered to bring precision and consistency to every installation. Precision-manufactured aluminum rails and carefully designed clips help establish accurate board alignment and spacing, creating a clean, uniform finish across the project. The system is designed to simplify installation while accommodating the natural movement of wood, helping deliver a deck or cladding installation that looks refined and performs as intended over time.

Grad offers an aluminum-based installation system designed for projects where non-combustible construction is a priority. The rails and structural components are made from aluminum, a non-combustible material that does not provide fuel for fire. While certain system components may melt when exposed to extreme heat, they do not act as a combustible material that sustains or spreads fire. This makes Grad an excellent solution for applications where fire performance and material safety are important considerations.

One same rail can be used to build cladding, decks, soffits, docks, fences, indoor wall panelling… with the same or different surface materials.

Using different rails system to use is straightforward, rendering various styles with the same product is feasible,  and installation is simplified.

— all rails are made of the same aluminum, with the same clips

— all rails can be used with the same surface materials

— all rails can be used for all purposes: walls, soffits, decks…

— all rails can be customized (only at manufacturing time, not on site) to deliver the exact style required on your project 
— thanks to our dismantling keys, decking and open joint cladding boards can be usually removed and updated no matter where they are on the deck, and the subdeck can be accessed at all times. Nothing gets damaged in the process
 
Clips can be removed but not moved along the rails. Their positioning is fixed and cannot be altered on site, only at manufacturing time in our factory. 

Say goodbye to nail popping, distorted looks, water traps, or lack of moisture control.

 

Because we use great quality materials, Grad products are extremely resistant to corrosion, fire, insect attacks, and rot. The system works perfectly across a wide temperature range of use. 

Boards can be subject to quick deterioration due to dampness but because boards sit on our clips, there is no contact between grad aluminum joists/rails and the boards, which helps prevent water traps and cupping. In siding applications: water drops easily and for decking applications: boards never touch joists.

Start Rails are wider than joists and can protect them better to keep them away from water: less need for joist tape.

The clips are made of material that does not fear humidity. They will not become brittal, and will keep their elasticity as they remain hidden below the boards and are kept away from UV light.

For vertical cladding (requiring rails to be fastened horizontally across studs): no 2 rails are ever fastened one after one: there is always a gap between two rails meaning that water would thin out before dropping down this gap.

Rails can be applied directly onto the prepared wall for vertical cladding, the rails have been profiled so that to ensure minimum water retention and to let water flow down. It is also important to note that walls are rarely straight and very often, when rails are applied on walls, there is gap between the rails and the wall they are on.

Ventilation: when anchored onto the clips, each board is sitting onto the clip, never directly onto the ground or the joists themselves

Durability: alu rails don’t warp, do not absorb moisture, are more resistant to corrosion (but cannot be in constant contact with salt water), do not fear insects, moss, algae, UV, and remain stable overtime unlike PT

Grad® clips are hidden under the boards and do not damage boards before their first utilization, they will not create splinters or water traps unlike board pre-drilling would do.

Grad® rails are light and easy to carry and ship.

No screws, no drilling = smoother and safer surface all around for enhanced board durability.

Rails are laid over joists of the decking frame and therefore rails cover the joists, protecting them better from rain water while letting them breathe = helps enhance joists durability and requires much less joist tape.

In most cases, boards are not fastened with screws or do not need screws to be fastened on the rails = only rails are fastened to joists. Rails use 2.5 times less screws than hastening each board individually with screws.

Less screws to use, less drilling to do, easier installation, less equipment to handle.

Care for the planet,and people, with long lasting designs

 

The tracks are made of 80% recycled aluminum and are 100% recyclable.

Whenever possible, the clips are made of recycled material, but are also 100% recyclable.

Since clips and tracks can be easily separated: recycling is easier.

Technical Support

accoya grey deck
accoya grey deck

A Technical and Design Partner for Architects

For architects and designers, Grad offers more than a decking or cladding system. Our team provides personal technical support from concept and specification through installation, helping you select the right system for your application, understand installation requirements and develop practical solutions for project-specific challenges. With technical documentation, product expertise and hands-on project support, we help make specifying and delivering Grad systems simpler and more reliable.

EXPLORE RESOURCES AND SUPPORT FOR ARCHITECTS  →

pedestal deck grad
Grad x Moso
Austria

Built for builders.

Grad systems are designed to make installation simpler, faster and more predictable for builders and installers. The rail-and-clip system helps establish consistent spacing and alignment, while boards can be secured by simply pushing them into the clips—reducing the need for visible fasteners and time-consuming positioning. The result is a clean, precise installation with fewer steps and less room for error. And when questions arise, our technical team is available to support you throughout the project, from system selection to installation.

EXPLORE INSTALLATION GUIDES  →

Mini Rails
Seattle, WA
@issaquahlumber. Used with Permission.

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