Premium Hollow vs Trex vs Millboard Composite Decking Visual Comparison

Choosing composite decking is much easier when you can see the boards side by side. From above, many boards look similar. The real differences show up in the cross section, the surface finish, the edge detail, and the way a finished deck looks in natural light.

This visual guide compares three popular options: Premium Hollow, Trex decking, and Millboard. It is designed as a quick, practical comparison rather than a long technical guide.

A cross section tells you a lot about how each board is built.

The main difference is inside the board

At first glance, all three options promise low maintenance, good durability, and a timber-style finish. The build is not the same.

Board type	What the cross section shows	General feel	Best suited to
Premium Hollow	Hollow chambers running through the board	Lightweight, practical, cost-conscious	Garden decks, rental properties, budget-aware projects
Trex decking	A solid composite core with a protective capped surface	Dense, consistent, modern	Family gardens, entertaining spaces, long-term upgrades
Millboard	A solid mineral-based core with a moulded surface layer	Premium, timber-like, detailed	High-end gardens, feature decks, design-led projects

The cross section matters because it affects weight, fixing style, edge trims, how the board feels underfoot, and the level of detail you can expect in the finished deck.

Premium Hollow composite decking

Premium Hollow boards are usually made from wood-plastic composite and formed with internal chambers. These hollow sections reduce the amount of material in each board, which helps keep weight and cost down.

The top surface often has a grooved or woodgrain pattern. Some boards are reversible, with a different texture on each side.

Premium Hollow boards are a practical choice for clean, simple garden spaces.

What it looks like installed

Premium Hollow decking gives a neat, uniform look. It works well on straightforward shapes, raised platforms, and simple seating areas.

The boards tend to look more regular than natural timber. That can be a benefit if you want a clean, modern finish.

Key visual clues

• The cut end shows open internal chambers

• The surface pattern is usually repeated along the board

• Edge trims or fascia boards are often used to hide exposed ends

• The finished look is tidy and functional

  
  

Things to think about

Hollow boards usually need more care around exposed edges, steps, and heavy-use areas. They can still make a smart deck, but the detailing matters. A good installer will plan trims, board direction, and fixings before the first board goes down.

Trex decking

Trex is a well-known composite decking brand. Its boards are typically made with a composite core and a protective outer cap. That cap helps with stain resistance and gives the board its finished colour and texture.

Trex boards usually feel denser than hollow composite boards. The surface is more refined, with a consistent grain effect and a more substantial feel underfoot.

Trex decking suits contemporary outdoor spaces with a polished finish.

What it looks like installed

Trex decking has a smooth, polished appearance without looking too plastic. It suits modern gardens, outdoor dining areas, and spaces where the deck sits close to the house.

Because the boards are capped, the colour and finish often look more even across the full deck. This can make a large area feel calm and ordered.

Key visual clues

• The cross section looks more solid and dense

• The surface has a protective outer layer

• Colours tend to be consistent from board to board

• Hidden fixings can create a clean gap line between boards

  
  

Things to think about

Trex is often chosen when the deck needs to feel like a long-term upgrade rather than a basic platform. It is usually more expensive than entry-level hollow boards, but the finish and brand reputation are part of the appeal.

For this Premium Hollow vs Trex vs Millboard comparison, Trex sits naturally in the middle ground: more premium than hollow composite, but usually less textured and timber-like than Millboard.

Millboard decking

Millboard is different from standard wood-plastic composite. It is known for its hand-moulded timber effect surface and solid mineral-based core. The surface detail is one of its biggest selling points.

Instead of looking like a printed or repeated grain, Millboard is designed to capture the irregular texture of real timber boards. It can look especially strong in close-up shots and detailed garden designs.

Millboard gives the most timber-like visual finish of the three options.

What it looks like installed

Millboard has the most natural timber effect of the three. It works well where the deck is a visible design feature, such as around steps, outdoor kitchens, hot tubs, garden rooms, and landscaped seating areas.

The surface texture gives depth, especially when sunlight catches the grain. This is where Millboard tends to stand apart visually.

Key visual clues

• The surface has deep, realistic grain detail

• The cut edge does not show hollow chambers

• It feels more like a premium landscaping material

• The finished deck often looks closer to natural timber

  
  

Things to think about

Millboard is usually a premium choice. It is often selected for appearance as much as performance. If the deck is a centrepiece, rather than just a practical surface, Millboard can justify the extra spend.

Quick visual buying guide

Use this simple guide when comparing samples or visiting completed projects.

If you want	Look first at
A practical deck at a lower cost	Premium Hollow
A strong all-round composite board	Trex decking
The most realistic timber appearance	Millboard
A lighter board to handle	Premium Hollow
A cleaner, more solid-feeling board	Trex decking
A premium garden design finish	Millboard

What to check before choosing

Photos help, but physical samples are still worth having. Place them outside, step on them, and look at them in wet and dry conditions.

Check these details before making a final decision:

• Cross section

  
  

Hollow, solid, or mineral-based construction changes the feel and detailing.

• Surface texture

  
  

Some boards look clean and uniform. Others look more like natural timber.

• Edge finish

  
  

Steps, corners, and exposed ends can make or spoil the final look.

• Fixing method

  
  

Hidden clips give a neater finish, but the subframe and spacing still need to be right.

• Colour in daylight

  
  

Composite boards can look different in shade, full sun, and after rain.

Seeing the samples outdoors makes colour and texture easier to judge.

The simple takeaway

Choose Premium Hollow if you want a smart, budget-friendly composite deck and the design is fairly simple.

Choose Trex decking if you want a solid, modern, well-established composite board with a clean finish.

Choose Millboard if the deck needs to look as close to real timber as possible and the visual detail matters most.

The best choice is the one that suits the whole project, not just the board sample. Look at the cross section, the installed finish, the edge details, and how the material works with the garden around it.