Understanding Composite Decking: What It Is and How It's Made
Composite decking is a manufactured material made by combining wood fibers or wood flour with plastic binders, most commonly polyethylene, polypropylene, or polyvinyl chloride (PVC). This combination creates a product that looks like traditional wood but has different performance characteristics. The wood content typically ranges from 50% to 70%, while the plastic content makes up the remainder. Some manufacturers also add additives like UV inhibitors, colorants, and fungicides to improve durability and appearance.
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The manufacturing process begins with wood waste materials—often sawdust, wood chips, or recycled wood—that would otherwise end up in landfills. These materials are combined with plastic polymers through heat and pressure, creating a dense, uniform product. The mixture is then extruded or molded into boards of various sizes and profiles. This controlled manufacturing process means composite boards have consistent color, grain pattern, and structural properties throughout, unlike natural wood which varies from board to board.
Composite decking became commercially available in the 1990s and has evolved significantly since then. Early composite products sometimes had issues with staining and mold growth, but modern formulations have addressed many of these concerns. Today's composites come in various styles—some designed to look smooth and contemporary, while others are textured to closely resemble wood grain. Prices for composite boards typically range from $5 to $15 per linear foot, compared to $2 to $8 for pressure-treated wood or $10 to $20 for cedar.
Understanding what composite decking actually contains helps you make informed decisions about whether it suits your project. The wood-plastic combination offers distinct trade-offs compared to solid wood or alternative materials like PVC or metal. Knowing the basics about composition and manufacturing will help you evaluate the different product options available and understand why certain composites perform differently than others.
Practical Takeaway: Composite decking is a wood-plastic blend manufactured to look like wood while offering different durability characteristics. Modern composites are made from recycled materials and come in numerous aesthetic options to match various home designs.
Comparing Composite Materials: Capped vs. Non-Capped and Core Types
One of the most important distinctions in composite decking is between capped and non-capped boards. Non-capped composites have wood-plastic material throughout the board's cross-section. These products cost less—typically $5 to $10 per linear foot—but the exposed plastic and wood on the board's edges and sides can absorb water and moisture over time. This absorption may lead to discoloration, mold growth, or structural changes in the material. Non-capped boards require more careful installation and maintenance, particularly in humid climates.
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Capped composites have an outer shell of pure plastic or plastic-dominant material that surrounds the wood-plastic core. This cap—usually a proprietary formulation—protects the core from direct water exposure, UV damage, and staining. Capped boards typically cost $8 to $15 per linear foot, making them more expensive upfront, but this protection may reduce long-term maintenance needs. Many major manufacturers now offer capped products because consumers value the reduced maintenance requirements. Brands like Trex, Azek, and TimberTech have developed various capped systems, each with slightly different compositions and warranties.
Within the core materials, manufacturers offer different construction approaches. Some use a solid composite core throughout, which provides consistent strength and stability. Others use a hollow or semi-hollow core design, which reduces material costs and makes boards lighter for handling. Hollow-core boards are less expensive and easier to install, but solid-core boards generally provide better strength for spans over 12 inches and may feel more substantial underfoot. A few premium products use engineered cores with reinforcing structures for enhanced support.
The choice between capped and non-capped depends on your climate, budget, and maintenance preferences. In dry climates, non-capped boards may perform adequately with moderate maintenance. In humid or coastal environments, capped products offer better protection against the elements. Understanding these structural differences helps you assess which type will meet your deck's expected lifespan and how much routine care you're willing to provide over time.
Practical Takeaway: Capped composite boards cost more but offer better moisture protection; non-capped options are budget-friendly but need more maintenance. Solid cores provide more strength than hollow cores, particularly for larger deck spans.
Popular Composite Decking Brands and Their Features
The composite decking market includes several established manufacturers, each offering multiple product lines with different performance levels and price points. Trex, founded in 1996, is the largest composite decking manufacturer in North America. Their product range includes Trex Select (an entry-level option around $6 to $9 per linear foot), Trex Transcend (mid-range with enhanced capping, $10 to $13), and Trex Infill Boards, which are narrower boards for creating mixed deck patterns. Trex products typically come with 25-year residential warranties and are known for consistent color and performance.
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Azek manufactures products like the Azek Deck line and their premium TimberTech offerings. Azek boards feature scratch and stain resistance through their surface protection system. Their products range from approximately $7 to $14 per linear foot. Azek is notable for their investment in manufacturing facilities and their focus on creating boards that closely resemble authentic wood grain patterns.
Fiberon, a brand under the Sika Corporation umbrella, produces capped composite boards with their "Natural Wood Polymer" core. Fiberon boards typically cost $6 to $12 per linear foot and include their ArmorShield protection system. The company emphasizes that their products resist staining, mold, and mildew growth, backed by 30-year warranties on residential installations.
Other notable manufacturers include MoistureShield, Ipe distributor companies that also produce composites, and various private-label brands sold through major retailers like Home Depot and Lowe's. Store brands typically offer lower prices ($5 to $9 per linear foot) but may have shorter warranties (10 to 15 years). All major manufacturers offer a range of color options—typical colors include grays, browns, blacks, and more recently, warm beige and accent tones. Most manufacturers also produce matching railing components, fascia boards, and trim pieces to create cohesive deck designs.
When comparing brands, consider warranty length (25 to 30 years is standard for premium products), stain resistance claims (backed by specific testing standards), and color options available for your design preferences. Reading third-party reviews and looking at installed examples helps you understand how specific brands perform in your climate region over time.
Practical Takeaway: Major manufacturers like Trex, Azek, and Fiberon dominate the market with various product tiers. Compare warranty lengths, surface protection systems, and available colors to find options that fit your budget and aesthetic goals.
Color, Texture, and Aesthetic Options in Composite Decking
Modern composite decking offers far more design flexibility than the early products that came in only brown or gray. Today's options include solid colors, multi-toned boards that blend multiple colors for depth, and wood-grain textures that range from subtle to dramatically realistic. Color choices span from warm taupes and honey tones to cool grays, charcoal blacks, and even undertones of blue or purple. Many manufacturers introduce new colors seasonally to align with design trends.
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Texture plays a significant role in both aesthetics and functionality. Smooth surfaces provide a contemporary look and are easier to clean, but can be slippery when wet. Textured boards, designed to replicate wood grain patterns, offer better slip resistance and feel more authentic to traditional wood decking. Some products feature grooved or brushed textures, while others use embossed patterns that create shadow and depth. A few specialty products offer edge-grooved or micro-textured surfaces that combine aesthetics with enhanced grip.
Many composite manufacturers now produce boards in multiple widths and profiles. Standard boards are typically 6 inches wide, but some companies offer 5.5-inch or 7.5-inch options to match specific design concepts. Specialty narrow boards (3 to 4 inches) allow for mixed-width deck patterns or can be used as accent stripes. Profile options include traditional flat surfaces, slightly cambered (curved) boards that shed water more