Not all composite deck boards are built the same. Some contain wood fibers that can absorb moisture over time. Others use rice husks and contain zero wood content. A few are 100% synthetic polymer from core to cap. And the type you choose affects everything from how your deck handles rain to whether it stays cool enough to walk on barefoot in July.
If you're comparing different types of composite decking and feeling overwhelmed by the options, you're not alone. This guide breaks down every type of composite decking available today, explains what each one is actually made of, and helps you match the right decking material to your specific project.
Quick Reference: Composite Decking Types at a Glance
| By core material: | Wood-fiber composite | Rice husk composite | PVC/Polymer |
| By profile: | Hollow core |
| By surface protection: | Capped (3 or 4-sided) | Uncapped |
| By edge type: | Grooved (hidden fasteners) | Square edge (face screws) |
| Best all-around for durability: | 4-sided capped, solid core, rice husk composite |
What is Composite Decking Made Of?
Before you can compare types of composite decking, you need to understand what goes into these boards. The term "composite decking" gets used loosely, but the composite decking materials inside each board vary more than most people realize.
Every composite deck board starts with a core material blended with recycled plastics (typically polyethylene or polypropylene). The difference is what gets mixed in with that plastic, and that core formula determines how the board handles moisture, heat, fire, and long-term wear.
Wood-Fiber Composites (The Industry Standard)
Most composite decking on the market today is made from a blend of wood fibers and recycled plastics. Brands like Trex and TimberTech use reclaimed wood and recycled plastics to create their composite deck boards. The result is a decking material that mimics the natural beauty of wood while resisting rot better than traditional wood decking.
The catch: wood fibers still absorb moisture. Even with protective capping, the cut ends and any exposed edges can wick water into the core over years of exposure. That absorbed moisture is what leads to mold and mildew issues in wood-fiber composite boards, especially in humid climates or on pool decks where water contact is constant. Wood fiber-based boards also have a lower fire rating.
Rice Husk Composites (The Wood-Free Alternative)
Rice husk composite decking replaces wood fibers entirely with rice husks, an agricultural byproduct. TruNorth Composites pioneered this approach, and the difference matters more than you'd expect.
Rice husks absorb significantly less moisture than wood fibers. That means rice husk composite deck boards don't rot, don't develop mold the way wood-fiber composites can, and offer superior fire resistance because there's no wood content to ignite. TruNorth's boards carry 95% recycled content and are independently certified by Intertek for quality control.
This is a critical distinction that most "types of composite decking" guides miss entirely. If moisture resistance is your top priority (pool decks, coastal areas, covered dock surrounds), rice husk composites are a different category of performance.
PVC/Polymer Decking (100% Synthetic)
PVC decking contains zero organic material. No wood, no rice husks. It's made from 100% cellular PVC polymer. Brands like Clubhouse Ultra (manufactured by TruNorth) offer maximum moisture resistance because there's nothing organic in the board to absorb water.
PVC decking sits at a premium pricing tier. It's the right choice for docks, waterfront commercial applications, and anywhere that constant water exposure makes even rice husk composites work harder than necessary. But for most residential decking projects, capped composite decking delivers excellent performance at a lower price point.
6 Types of Composite Decking Boards Explained
Composite decking types break down across three dimensions: surface protection (capped vs. uncapped), core profile (solid vs. hollow), and edge style (grooved vs. square). Here's what each one means for your deck.
Capped Composite Decking
Capped composite decking features a protective polymer shell wrapped around the core. That cap acts as a shield against fading, staining, scratching, and moisture penetration. It's the reason modern composite decking can carry 25-year fade and stain warranties.
There's an important detail most buyers miss: not all capped composite decking is created equal. Some boards are capped on three sides, leaving the bottom exposed. Others, like TruNorth Accuspan and Enviroboard, feature 4-sided capping that protects every surface, including the underside and the grooves. That fourth side matters because moisture rises from below the deck, especially in ground-level installations or over concrete pads.
If you're buying capped composite decking, ask specifically whether it's 3-sided or 4-sided capping. The difference shows up 5-10 years down the road.
Uncapped Composite Decking
Uncapped composite decking is the original form of composite material. It offers the look of natural wood at a lower price point, but the core material is fully exposed to the elements. Without that protective cap, uncapped boards require more upkeep. Expect to deal with stain absorption, faster fading, and potential mold and mildew growth in damp conditions.
Uncapped composite works for low-budget projects where you're comfortable with periodic maintenance, similar to what traditional wood decking demands. But for most homeowner projects today, capped boards are worth the price difference.
Solid Core Composite Decking
Solid composite decking is dense all the way through, with no hollow channels. It's heavier, more structurally rigid, and performs best in high-traffic areas or commercial applications where the deck needs to support furniture, foot traffic, and regular wear.
TruNorth's Accuspan (Gen II) is a solid core composite with a rice husk formula and 4-sided capping. It's the premium option in TruNorth's lineup, designed for new deck construction and applications where structural strength matters. The boards are reversible with dual-embossed wood grain textures, so you can choose the pattern you prefer during installation.
Solid core boards cost more and weigh more. Plan for the added weight during installation, especially if you're carrying boards up stairs or across a yard.
Hollow Core Composite Decking
Hollow composite decking uses a lighter profile with internal channels that reduce weight and material usage. TruNorth's Enviroboard is a hollow core design with the same rice husk capping technology and 25-year warranty as their solid Accuspan line.
The practical difference? Easier handling during installation and lower cost per board. Hollow core composite decking is a strong choice for DIY deck projects and budget-conscious renovations where you want the performance of quality composite decking materials without the premium of solid boards.
One thing to know: hollow boards need proper joist spacing for structural support. Follow the manufacturer's specifications. Cutting hollow boards also exposes the interior channels, so you'll want end caps or fascia boards to finish the edges cleanly.
Grooved Edge Composite Deck Boards
Grooved composite decking boards have channels milled into the sides that accept hidden fasteners. The result is a clean, screw-free deck surface. No visible nails or screws means a sleeker look and no risk of catching bare feet on fastener heads.
Grooved boards require compatible hidden fastener systems. TruNorth's Slide & Go fastening clips work with their grooved edge boards and install quickly. The trade-off: grooved boards are slightly less forgiving during installation because the clips set the board spacing for you, and removing a single damaged board from the middle of a run takes more effort than popping out a face-screwed board.
Square Edge Composite Deck Boards
Square edge decking uses traditional face-screwing with composite decking screws or a colour-matched plug system like the Starborn Pro Plug. You'll see the fastener on the surface (or the plug that covers it), but installation is straightforward and forgiving.
Square edge boards are the better choice when you need to replace individual boards easily, when your deck layout has irregular angles that make hidden fastener alignment tricky, or when you simply prefer the traditional look of a face-screwed deck.
Composite Decking Types Compared
This table puts the main types of composite decking side by side so you can compare the features that matter for your project.
| Feature | Capped Composite | Uncapped Composite | Solid Core | Hollow Core | PVC/Polymer |
| Core Material | Wood fiber or rice husk + plastic | Wood fiber + plastic | Dense solid profile | Lighter hollow profile | 100% cellular PVC |
| Moisture Resistance | High (depends on cap) | High | High | High (with capping) | Highest |
| Fire Resistance | Moderate to high | Low to moderate | Varies by core | Varies by core | High |
| Weight | Medium to heavy | Medium | Heaviest | Lightest | Light to Medium |
| Maintenance | Soap and water | Periodic staining | Soap and water | Soap and water | Soap and water |
| Typical Warranty | 25 years | 10-15 years | 25 years | 25 years | 25-50 years |
| Best For | Most residential projects | Budget Projects | High-traffic, commercial | DIY, renovations | Waterfront, docks |
| Price Range | $$ | $ | $$$ | $$ | $$$$ |
How Different Composite Decking Materials Perform
Understanding performance by category helps you avoid spending too much (or too little) for your specific situation. Here's how the different types of composite decking materials stack up where it counts.
Moisture and Rot Resistance
Traditional wood decking rots. That's the core reason most homeowner projects are shifting to composite. But among composite decking options, moisture resistance varies widely.
Wood-fiber composites resist moisture far better than natural wood, but the wood content still absorbs some water over time. Rice husk composites (like TruNorth's lineup) absorb less moisture because rice husks naturally repel water more effectively than wood fibers. PVC decking boards are essentially impervious to moisture because they contain zero organic material.
For pool decks, waterfront properties, and any installation where standing water is common, rice husk composites or PVC decking are the smart decking options.
Fire Resistance
Fire resistance is a decking material consideration that rarely comes up until it matters. Wood-fiber composites burn at similar rates to wood because of their organic content. Rice husk composites are more fire-retardant than wood-based composites because they don't contain wood fibers. PVC decking, like the Clubhouse brand, performs the best in fire resistance testing.
If you're building a deck in a wildfire-prone area or near a gas grill, the composite material's fire rating matters. Ask your manufacturer for specific test data.
Heat and UV Performance
Does composite decking get hot in the sun? Yes. Every decking material absorbs heat, including wood. But darker colors absorb more, and some composites dissipate heat better than others.
TruNorth composite deck boards include heat-blocking technology designed to keep the surface cooler than standard wood-based composites. Lighter colors also help. If heat is a major concern for your outdoor space, choose lighter tones and look for boards with specific heat-reduction features.
UV performance is where capping earns its money. Capped composite decking carries 25-year fade warranties because the polymer cap filters UV exposure. Uncapped boards will show noticeable color change within 3-5 years without annual maintenance.
Scratch and Stain Resistance
The hard polymer capping on capped composite decking provides the first line of defense against scratching from furniture legs, pet claws, and dropped tools. Solid core boards with 4-sided capping (like TruNorth Accuspan) offer the highest scratch resistance because the dense core supports the cap without flexing.
For stain resistance, capped boards excel. Food, grease, wine, and sunscreen wipe off with soap and water. Uncapped composite decking absorbs stains more readily because the core material is exposed.
Benefits of Composite Decking Over Traditional Wood
The benefits of composite decking go beyond "it lasts longer than wood." Here's what actually changes when you choose composite over traditional wood decking for your outdoor living space.
Zero annual staining or sealing. Wood decks need staining every 1-2 years to prevent grey weathering, splintering, and rot. Composite decking is designed for soap-and-water cleaning with soap and water only. Over a 25-year span, those avoided staining costs add up to thousands.
No splinters, no rot, no insect damage. Composite decking doesn't splinter, making it safer for bare feet and children. It won't rot even in constant moisture. And insects (including termites) have no interest in composite materials.
Color consistency over time. Capped composite decking maintains its color for decades. Natural wood decking starts fading the day it's installed unless you commit to regular maintenance.
Made from recycled materials. Most composite deck boards use recycled plastics and reclaimed wood or rice husks. TruNorth boards contain 95% recycled content. Building a deck with composite means diverting plastic waste from landfills while reducing demand for new timber.
Long-term savings. Composite decking costs more upfront than pressure-treated wood. But when you factor in zero staining, no board replacement from rot, and 25-year warranties, composite decking is the lower total cost of ownership over the life of the deck.
How to Choose the Right Type of Composite Decking
The "best" type of composite decking depends entirely on your project. Here's a decision framework based on the four most common scenarios.
For Budget-Friendly Renovations
Start with hollow core, capped composite decking. TruNorth Enviroboard gives you the same capping technology and 25-year warranty as their premium solid board, but at a lower price per board. The lighter weight also makes it easier to handle if you're doing the work yourself. Pair it with grooved edges and Slide & Go clips for a clean finished look.
For High-Traffic or Commercial Applications
Solid core, capped composite decking handles heavy foot traffic, commercial furniture, and constant use better than hollow profiles. TruNorth Accuspan's dense solid core and 4-sided capping make it a strong choice for restaurants, rental properties, condo common areas, and any deck that needs to hold up to heavier-than-residential use.
For Pool Decks and Waterfront Areas
Moisture resistance is everything here. Rice husk composites outperform wood-fiber composites around pools because the core absorbs less water. For docks and fully waterfront installations, PVC decking (like Clubhouse Ultra) gives you the highest possible moisture resistance because it contains zero organic material. Consider heat-blocking technology if the deck gets direct sun, and choose lighter composite decking colors to keep the surface walkable in summer.
For Premium New Builds
Go solid core, 4-sided capped, with the color and texture that matches your home's exterior. TruNorth Accuspan offers 12 colors across solid and variegated options, all with reversible dual-embossed boards. That reversibility gives you installation flexibility and a second design option if you change direction mid-project. Pair with colour-matched Starborn Pro Plug fasteners for a seamless look, or use hidden fastener clips on grooved boards for a completely clean surface.
Common Mistakes When Choosing Composite Decking
Choosing uncapped to save money, then paying for it later. Uncapped composite decking costs less upfront, but the maintenance demands and shorter lifespan often erase the savings within 5-7 years. Capped boards cost more per square foot but need virtually nothing in upkeep.
Ignoring the core material. A lot of buyers focus on color and price while overlooking what the board is actually made of. Wood-fiber cores, rice husk cores, and PVC cores all behave differently around water, heat, and fire. Ask what's inside the board, not just what it looks like.
Using the wrong fastener for your board type. Grooved boards need hidden fasteners. Square edge boards need face screws or plugs. Mixing them up creates structural problems and void warranties. Check your manufacturer's recommended fastener list before buying.
Forgetting about joist spacing. Hollow core boards need tighter joist spacing than solid core boards for the same structural support. Building your frame first without knowing your board type can mean ripping it out and starting over.
Comparing only upfront cost. The lowest-price composite board and a premium capped composite board with a 25-year warranty aren't comparable products. Factor in maintenance costs, replacement timeline, and warranty coverage to calculate the real cost of each decking material over its lifetime.
FAQ: Types of Composite Decking
What are the main types of composite decking?
Composite decking types are categorized by core material (wood-fiber composite, rice husk composite, or PVC/polymer), by profile (solid core or hollow core), by surface protection (capped or uncapped), and by edge style (grooved for hidden fasteners or square edge for face-screwing). Most modern composite decking products combine capped construction with either solid or hollow core profiles.
What's the difference between capped and uncapped composite decking?
Capped composite decking has a protective polymer shell wrapped around the core that resists fading, staining, scratching, and moisture. Uncapped composite decking exposes the raw composite material to the elements. Capped boards carry longer warranties (typically 25 years for fade and stain), require less maintenance, and perform better in harsh weather. The price difference between capped and uncapped is typically 15-30%, but the long-term savings on maintenance make capped the better value for most projects.
Is PVC decking the same as composite decking?
No. Composite decking is made from a mix of organic material (wood fibers or rice husks) and recycled plastics. PVC decking is made from 100% synthetic polymer with zero organic content. PVC offers the highest moisture resistance and is best for docks, waterfront areas, and applications with constant water exposure. Some brands (like Clubhouse Ultra by TruNorth) are PVC products often grouped under the "composite" umbrella, but the material composition is fundamentally different.
What type of composite decking is best for a pool deck?
Rice husk composite decking or PVC decking. Both resist moisture better than wood-fiber composites. Rice husk composites like TruNorth Accuspan or Enviroboard absorb less water than wood-fiber alternatives, and PVC decking like Clubhouse Ultra is fully impervious to moisture. Look for boards with heat-blocking technology and choose lighter colors to keep the deck surface cooler underfoot.
Does composite decking get hot in the sun?
All decking materials absorb heat, including wood. Darker composite deck boards get hotter than lighter ones. Some composite brands include heat-blocking technology in their boards to reduce surface temperature. If heat is a concern for your outdoor living space, choose lighter composite decking colors and look for boards tested for heat reduction.
How long does composite decking last compared to wood decking?
Capped composite decking typically lasts 25-30+ years with minimal maintenance (soap and water cleaning). Traditional wood decking lasts 10-15 years with annual staining and sealing, or 5-7 years without maintenance before significant rot and structural issues appear. Composite's longer lifespan and lower maintenance costs make it the more cost-effective choice over the life of the deck, despite higher upfront cost.
What is rice husk composite decking?
Rice husk composite decking uses rice husks instead of wood fibers in the composite core. This eliminates the wood content entirely, which means no rotting, superior fire resistance, better moisture resistance, and enhanced durability compared to wood-fiber composites. TruNorth Composites manufactures rice husk composite decking in Brantford, Ontario, Canada with a computer-controlled process and independent Intertek certification. Their boards carry 95% recycled content.