Views: 0 Author: Site Editor Publish Time: 10-09-2026 Origin: Site
Outdoor flooring is one of the first decisions that shapes how a project looks — and one of the last places you want to compromise. Natural timber gives you the warmth buyers want, but it also asks for sanding, sealing and repainting year after year.
6-round hollow WPC decking was developed to solve exactly that trade-off. It keeps the grain and colour depth of real wood, while offering the weather resistance and low maintenance of wood plastic composite. The result is a deck board that looks residential-grade in a garden and strong enough for high-traffic commercial spaces.
This guide explains what the "6-round hollow" profile actually means, why it matters on site, and how to choose between six wood-grain finishes: Dark Walnut, Dark Basalt Grey, Light Silver Grey, Cream Rice, Storm Grey and Charcoal Black.
WPC stands for Wood Plastic Composite — a material that combines wood fibre with polymer. The wood component provides the natural texture and tone; the polymer component provides the durability, moisture resistance and colour stability that timber cannot offer outdoors.
"6-round hollow" describes the cross-section of the board. Running through the core are six round hollow chambers, visible on the cut end of every plank. This is not a cosmetic detail — it is the structural signature of the profile, and it is the reason this board category has become a mainstream choice for outdoor decking.
The surface carries an embossed wood grain, so the board reads as timber from a normal viewing distance — while the material behind it behaves like a composite.
Lighter boards, easier installation. The hollow core removes material weight without sacrificing the surface you walk on, which makes the boards easier to carry, position and fix — particularly on upper-floor terraces where handling effort drives labour cost.
Airflow through the deck system. The chambers allow air to move within the board structure, which helps the decking system manage moisture across changing seasons instead of trapping it.
Rigidity where it counts. The round chamber walls act as internal ribs, keeping the board stiff enough to span as part of a properly designed substructure while staying manageable in length.
A familiar wood look. Because the wood grain is embossed on a flat wearing surface, the finish stays consistent from board to board — no two-tone streaking, no knots in the wrong place.
All six finishes below come from the same profile and the same wood-grain surface — the difference is tone, and tone changes how buyers read a space.
Colour | Tone | Where It Works Best |
|---|---|---|
Dark Walnut | Deep chocolate brown with rich warm grain | Traditional gardens, villas, boardwalks — the closest to classic hardwood decking |
Dark Basalt Grey | Cool mid-dark grey, stone-like | Modern landscape design, urban terraces, contemporary residential |
Light Silver Grey | Pale silver grey, soft and reflective | Smaller gardens and shaded courtyards that need to feel brighter and more open |
Cream Rice | Warm sand-beige, soft and natural | Coastal projects, resorts, poolside areas, warm-climate markets |
Storm Grey | Deep stormy grey, high contrast | Statement terraces and minimalist architecture that use shadow as a design element |
Charcoal Black | Near-black, strong and graphic | Bold contemporary facades, commercial and hospitality outdoor spaces |
Dark Walnut is the safest choice for buyers who want the deck to look like timber. The brown base hides everyday dust and leaf litter well, which makes it practical for gardens with heavy tree cover.
Dark Basalt Grey suits projects where the deck should read as stone rather than wood. It pairs naturally with concrete, steel and glass.
Light Silver Grey is a practical answer to small or north-facing spaces. A lighter surface reflects more daylight and keeps the deck from visually shrinking the garden.
Cream Rice works particularly well near water. The warm, sandy tone sits comfortably beside pool tiles and coastal planting, and it stays visually cool under strong sun.
Storm Grey carries more depth than a standard grey. Because it reads almost blue in shade and almost black in sunlight, it is a strong fit for projects designed around contrast.
Charcoal Black is the most architectural option. It frames planting and furniture sharply and is a common choice in hospitality and commercial exteriors where the deck is part of the brand image.
Residential garden terraces. Dark Walnut and Dark Basalt Grey cover most briefs. Choose walnut where the client wants warmth and a traditional feel; choose basalt grey where the house is modern and the landscape is hard-edged.
Poolside and coastal. Cream Rice and Light Silver Grey perform best visually: both keep the surface looking bright next to water, and neither shows water marks as strongly as a dark board.
Commercial and hospitality. Storm Grey and Charcoal Black project a deliberate, designed look that holds up in photographs and signage — useful when the outdoor area is part of the customer experience.
Colour blocking. Because all six finishes share the same profile and grain, they can be combined in one design. A common approach is a main field in a mid tone, with a contrasting border, stair edges or a walkway in a lighter or darker finish. Mixing colours within one project is straightforward when the boards come from the same product family.
Colour is the visible decision — specification is the one that determines whether the deck performs. When you send a project enquiry, include:
Total deck area and a simple layout sketch or drawing
The colour or colour combination you prefer
Whether the deck is at ground level, on a terrace or over a structure
Any climate or usage conditions worth knowing (coastal air, heavy foot traffic, strong sun)
Whether you need matching accessories such as clips and support joists
With those details, a supplier can recommend the right board quantity, accessory set and packing plan instead of quoting from a colour image alone.
One of the main reasons specifiers move from timber to WPC is what the deck does not require:
No annual sanding, staining or re-oiling
No sealing against moisture
No splinter repair
Routine care is limited to sweeping and an occasional wash with water and a mild household cleaner. For coastal or commercial installations, more frequent rinsing keeps salt and dust from settling into the grain.
Can WPC decking be used in coastal or wet climates? Yes. WPC is formulated to resist moisture, which is why it is widely used around pools, on coastal terraces and in humid regions. Regular rinsing helps maintain the surface in salt-air environments.
Will the colour change over time? Outdoor materials are exposed to sun and rain, so some lightening is normal over the life of any deck — WPC far less so than untreated timber, which greys quickly without re-oiling.
Can I mix two colours in one deck? Yes. Because every finish in this family shares the same profile and embossed grain, mixing colours produces a clean border or inlay rather than a patchwork.
Is hollow-core decking weaker than solid decking? No. The round chambers act as internal ribs and the board is engineered to work as part of a complete deck system with suitable joists and fixings. Hollow core is a design choice that reduces weight, not performance.
Do I need special tools to install it? Standard woodworking tools handle WPC boards. Using the matching clips and joists is what keeps the deck flat, evenly spaced and stable.
Colour on a screen is never the same as colour under a client's sky. For outdoor projects, order physical samples of the finishes you are shortlisting and lay them on site — that is the only reliable way to judge how Dark Walnut, Storm Grey or Cream Rice will read against the building and the planting.
[Contact Anhui KSL New Material Co., Ltd. to request a sample set and a project quotation.]
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