Performance
Engineered for high-traffic endurance with slip-resistant surfacing and thermal stability across all climates (stays cooler in summer than composite decking).
Durability
Ultra-low maintenance composite technology that resists fading, staining, scratching, and mold growth for decades. No additional treatments or coats needed.
Aesthetic
Accoya Natural and Accoya Color Grey showcase the beauty of authentic wood grain in refined, nature-inspired tones for a sophisticated, artisanal outdoor aesthetic. Accoya Color Grey is colored to the core.
Size: 5/4 x 6" (Actual 1" x 5 ¾")Â
Multiple board lengths available.
Accoya Decking Specifications, Fasteners and Care
regulatory & material Class
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Durability Class: Class 1 (EN 350-2) — Highly resistant to wood-destroying beetles, termites, and fungi.
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Use Class Classification: Use Class 3 (UC3) & Use Class 4 (UC4) (EN 335 / AWPA U1) — Specifiable for both standard above-ground decking and heavy-duty ground-contact/freshwater applications.
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Structural Grading: Classified as C22/C16 (EN 338) depending on dimensions; suitable for pedestrian and commercial traffic.
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Slip Resistance: Pendulum Test Value (PTV) >36 in wet conditions (BS 7976-2) when grooved or brushed, satisfying "Low Slip Potential" guidelines.
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Janka Hardness Rating: 922 lbf (4,100 N) side grain; 1,484 lbf (6,600 N) end grain (ASTM D143). Meets indentation resistance standards for high-traffic exterior flooring.
DIMENSIONAL ENGINEERING & PROFILES
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Swell/Shrink Efficiency: Dimensional stability increased by ≥ 75% (tangential and radial coefficients ≤ 1.5% from oven-dry to fully saturated).
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Available Dimensions: 5/4 x 6
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Edge Profiles: Square-edge (for face-screwed installations) or Side-Grooved (engineered for concealed clip fastening systems).
architectural specification notes
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Span Capabilities: Maximum structural joist spacing of 400mm (16 inches) on-center for standard 21mm/26mm residential applications; 300mm (12 inches) on-center for commercial code compliance.
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Concealed Fastening Systems: Approved for use with premium side-clip systems (e.g., ExoDeck, CAMO, Eb-Ty, Grad) engineered with stainless steel hardware to accommodate uniform expansion. We recommend face screws (stainless steel, 304 or 316 for seaside/coastal) for boards wider than 5 inches, using 3/16" gap spacers between deck boards.
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Sub-Deck Ventilation: Requires a minimum uninhibited air gap of 40mm to 75mm beneath the joist system to prevent localized vapor pressure buildup.Â
Hidden Deck Fasteners
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Hidden Fastener:Â Requires symmetrical side grooves cut into the edge of the board profile to securely house wings of the clip.
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Fastener capability:  Glass fiber reinforced nylon clips specifically engineered to fit the side-grooved profiles of Accoya and Accoya Color deck boards. These clip systems automatically set a precise 1/4-inch (approx. 6mm) gap between boards, ensuring necessary drainage and ventilation
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No Face Screws: Clips fasten directly into the substructure joists rather than punching through the top face of the wood, preventing splits, checking, and unsightly screw heads.​
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Movement Allowance: Accoya is exceptionally stable, but hidden clip systems still accommodate micro-shifts and encourage continuous airflow beneath the boards to stop moisture buildup and mold.
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ExoDek Quick Clip
ExoDeck QuickClip info with milled profile spec dimensions PDF (Download)
Camo hidden deck fastener
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The Camo Hidden Deck Fastener system is an innovative solution designed to create a smooth, nail-free deck surface. The fasteners work by attaching to the sides of the decking boards, securing them without visible screws on the surface. This not only improves the appearance but also extends the life of the deck by minimizing the exposure of fasteners to the elements, reducing the risk of corrosion or damage.
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Does not require side groove like ExoDek Quick Clip and many other hidden fastener systems.
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The Camo Hidden Deck Fastener system is sold separately from your Woodland purchase, and can be sourced from major building supply retailers.