Composite decking has evolved significantly over the past two decades. Early products—often called first-generation composite decking—were simply a blend of wood fibres and plastic formed into boards. Today, most premium products use co-extrusion technology, also known as capped composite decking, which adds a protective outer layer.

If you’re comparing Classic Series (first-generation) and Pro Series (co-extrusion) decking, understanding their differences can help you choose the right option for your outdoor space.

What Is First Generation Composite Decking (Classic Series)?

First-generation composite decking is the original form of WPC decking. It is produced by mixing wood fibres and recycled plastic and extruding them into boards.

Because the material is uniform throughout the board, the surface and the core are made of the same composite material.

Key Characteristics

• Single-layer construction

• Natural wood-like texture

• Cost-effective option

• Good structural strength

However, because the surface contains wood fibres, it is slightly porous, allowing moisture and stains to penetrate the material over time.

What Is Co-Extrusion Composite Decking (Pro Series)?

Co-extrusion decking is an upgraded version of traditional composite decking. It features a protective polymer shell bonded around a composite core.

This outer layer acts like a protective shield, protecting the board from:

• Moisture

• UV rays

• Stains

• Scratches

• Mould and mildew

The protective cap is usually made from high-performance polymers such as PVC or advanced plastics designed for outdoor durability.

Structural Difference

The biggest difference between the two types of decking lies in their construction.

Classic Series (1st Generation)

Pro Series (Co-Extrusion)

The additional protective layer dramatically improves the board’s surface performance.

Key Differences Between Classic and Pro Series Decking

Because the cap prevents liquids and dirt from penetrating the board, capped composite decking generally offers better stain resistance and colour stability.

Stain and Moisture Resistance

One of the biggest improvements in co-extrusion decking is its resistance to everyday spills.

The protective cap forms a non-porous surface, meaning liquids stay on the surface rather than soaking into the material.

This makes it easier to clean common outdoor spills, such as:

• Wine

• Coffee

• BBQ oils

• Soy sauce

• Mud and dirt

By contrast, uncapped composite decking can absorb small amounts of moisture because wood fibres remain exposed.

Durability and Lifespan

The protective outer layer of co-extrusion decking improves durability in several ways.

It helps protect the core from:

• UV damage

• Water penetration

• Mold growth

• Surface wear

Because of this, capped composite decking generally lasts longer and requires less maintenance than traditional composite boards.

Maintenance Requirements

Both types of composite decking are considered low-maintenance compared with timber.

However, the difference becomes noticeable over time.

Classic Series

• Needs occasional deep cleaning

• Surface may fade gradually

• Stains may require scrubbing

Pro Series

• Typically cleaned with soap and water

• Resistant to fading and staining

• Retains colour longer

In most cases, a simple wash once or twice a year is sufficient for capped decking.

Cost Considerations

First-generation composite decking is typically more affordable, making it a good option for budget-conscious projects.

Co-extrusion decking costs more initially due to the additional protective layer and manufacturing process.

However, many homeowners find that the longer lifespan and lower maintenance costs offset the higher upfront price over time.

Which Decking Option Is Better?

The best choice depends on your priorities.

Choose Classic Series if you want:

• A cost-effective decking solution

• A natural wood-like appearance

• Reliable performance for residential decks

Choose Pro Series if you want:

• Maximum durability

• Better stain and scratch resistance

• Lower long-term maintenance

• Longer product lifespan

For high-traffic areas, pool surrounds, or BBQ spaces, co-extrusion decking is often the better long-term investment.

Final Thoughts

First-generation composite decking laid the foundation for modern outdoor materials, but co-extrusion technology represents the next step in performance and durability.

While Classic Series decking offers a cost-effective and natural-looking option, Pro Series decking delivers enhanced protection against stains, moisture, and UV exposure—making it ideal for demanding outdoor environments.

When choosing between the two, consider your budget, maintenance expectations, and how you plan to use your outdoor space.