what is composite decking made out of

"What's Composite Decking Made Of: A Comprehensive Guide"

By Kevin MartinezApril 21, 2026

Understanding Composite Decking: A Closer Look at Its Composition

When it comes to choosing the right material for your outdoor living space, composite decking often tops the list. But what exactly is composite decking made of? This eco-friendly and low-maintenance material is a blend of various components that give it its unique properties. Let's delve into the composition of composite decking and explore the benefits of each ingredient.

Plastic: The Base of Composite Decking

The primary component of composite decking is plastic, typically polyethylene (PE) or polyvinyl chloride (PVC). This base material provides the structural integrity and durability that composite decking is known for. Here's a breakdown of each type:

Polyethylene (PE): PE is a flexible and durable plastic that makes composite decking resistant to moisture, stains, and scratches. It's also less prone to fading compared to PVC.
Polyvinyl Chloride (PVC): PVC offers excellent durability and is resistant to rot, insects, and mold. However, it may fade more quickly than PE and can become brittle over time.

Wood Fibers: Enhancing Natural Beauty

To give composite decking its natural wood-like appearance, wood fibers or flour are added to the plastic base. These can be sourced from reclaimed or recycled wood, making composite decking an eco-friendly option. The wood content also contributes to the decking's texture and traction, preventing slips and falls.

7 Problems with Composite Decking - The Craftsman Blog

12 Things You Must Know Before Building A Composite Deck

Binders and Stabilizers

To bind the plastic and wood fibers together, binders are added to the composite decking mixture. Common binders include:

Resins: Resins act as adhesives, binding the plastic and wood fibers together to create a solid, uniform material.
Stabilizers: Stabilizers help maintain the decking's color and prevent it from degrading under UV exposure. Common stabilizers include titanium dioxide and carbon black.

Additives for Enhanced Performance

To further improve the performance and longevity of composite decking, various additives are incorporated into the mixture. These can include:

Composite Decking Vs. Wood Decking: Which is the Better Choice?

Composite Decking: How to Choose Which Wood Alternative is Right for Your Backyard Deck

DIY Outdoor Table: What to do with Leftover Composite Decking? - The DIY Nuts

Antioxidants: Antioxidants help protect the decking from UV damage and oxidation, extending its lifespan.
Antimicrobial agents: These agents inhibit the growth of mold, mildew, and bacteria, keeping your decking clean and hygienic.
Colorants: Colorants give composite decking its wide range of colors and help achieve a natural wood grain appearance.

Comparing Composite Decking to Other Materials

When considering the composition of composite decking, it's helpful to compare it to other popular decking materials. Here's a quick comparison:

Material	Primary Components	Eco-friendliness	Maintenance
Composite Decking	Plastic (PE or PVC), wood fibers, binders, stabilizers, and additives	High (often made from recycled materials)	Low (resistant to moisture, stains, and insects)
Wood Decking	Natural wood (e.g., cedar, pressure-treated lumber)	Moderate (renewable but may require chemical treatments)	High (susceptible to rot, insects, and moisture damage)
PVC Decking	PVC, wood fibers, binders, and stabilizers	Moderate (not as eco-friendly as composite decking)	Low (similar to composite decking but may become brittle over time)

Choosing the Right Composite Decking for Your Needs

Now that you understand the composition of composite decking, you can make an informed decision when selecting the perfect material for your outdoor space. Consider factors such as color, texture, and specific performance requirements to find the best fit for your project.