If you’re planning a new dock on Lake Travis, Lake Austin, or in the Texas Hill Country, you’ll face a choice that matters more than you might expect: what material will your dock decking be made from? It’s not just about appearance. The material you choose affects safety, maintenance, durability, costs, and how much you enjoy using your dock over the next 10, 15, or even 20 years.
We’ve installed docks with wood, composite, and aluminum decking over hundreds of projects around Austin. Each material has distinct advantages and tradeoffs. This guide focuses on composite dock boards because they’ve become increasingly popular—and for good reason—but we’ll also compare them honestly to other options so you can make the right choice for your situation.
What Exactly Are Composite Dock Boards?
Composite decking is made from a blend of wood fibers (often recycled) and plastic polymers, typically polyethylene or polypropylene. The wood gives the material strength and a natural appearance. The plastic provides water resistance and durability. Mixed together and extruded or molded into board form, composites split the difference between wood’s workability and plastic’s longevity.
This is fundamentally different from solid wood decking (which rots and splinters) and from solid plastic (which degrades in UV light and doesn’t look as natural). Composite is engineered specifically for outdoor waterfront applications.
When people talk about “composite dock boards,” they’re usually referring to one of several premium brands that dominate the market. Let’s talk about the major players and what you actually get for your money.
The Top Composite Dock Board Brands
Trex: The Market Leader
Trex is the largest composite decking manufacturer in North America. You’ve probably heard the name, and for good reason: they’ve been making composite decking since 1996 and they’ve invested heavily in R&D.
Trex boards cost between $4 and $8 per linear foot, depending on the product line and where you buy. Their entry-level line (Trex Select) runs $4 to $5 per foot. Their premium line (Trex Transcend) runs $7 to $8 per foot. For a typical 12-by-16-foot dock, you’d use roughly 400 linear feet of decking boards, so material cost alone ranges from $1,600 to $3,200.
What do you get for the premium? Trex Transcend comes with better color retention, superior stain and fade resistance, and enhanced durability. The top-tier lines hold up better to the intense Texas sun and still look good after 8 to 10 years. Trex Select is perfectly functional but will show more wear and fading faster.
Trex’s strength is their consistency and their warranty. Every board is manufactured to tight specifications, which means fewer gaps and a more uniform appearance on your dock. Their 25-year limited warranty is solid, though it doesn’t cover everything.
TimberTech: The Strong Alternative
TimberTech is owned by Lowe’s parent company and competes directly with Trex. Their pricing is comparable: $4 to $7 per linear foot depending on the product line.
TimberTech’s advantage is that they’ve optimized their products specifically for high-moisture environments. They use a technology called XLM that makes their boards more resistant to moisture absorption. If you’re planning a dock on Lake Travis where seasonal water level changes are extreme, TimberTech’s engineering can be a smart choice.
TimberTech also tends to have better availability if you’re buying through big-box retailers. Quality is consistent, and their warranty coverage is similar to Trex.
Fiberon: Value-Conscious Choice
Fiberon positions itself as the budget-friendly composite option. Their boards run $2.50 to $5 per linear foot—noticeably cheaper than Trex or TimberTech.
The tradeoff is that you get less premium material and shorter warranties in some product lines. Fiberon works fine for dock applications, but you’ll likely replace or refinish it sooner. They’re a solid choice if you’re working with a tight budget or if you’re okay with redecking your dock in 8 to 10 years.
MoistureShield: Specialty Engineered for Water
MoistureShield focuses specifically on moisture-prone applications. Their boards are engineered to resist water absorption better than conventional composites. Cost is in the $5 to $7 per linear foot range.
If you’re building a dock in a particularly wet microclimate on Lake Austin or Lake Travis—or if you’re dealing with high humidity in the Hill Country—MoistureShield is worth the consideration. Their engineering really shows in humid climates.
How Much Will Your Composite Dock Actually Cost?
Material cost is important, but it’s not your total cost. Let’s break down a realistic full installation.
Decking Board Material: $2,000 to $3,500
For a standard 12-by-16-foot dock (192 square feet), expect 400 to 450 linear feet of decking boards at $4 to $8 per foot. Plus, you need edging boards, and the material cost comes to around $2,000 to $3,500 depending on brand and quality level.
Substructure and Framing: $2,000 to $5,000
Composite boards need to be installed over a solid substructure. On Lake Travis and Lake Austin, we typically use pressure-treated lumber or aluminum framing. The substructure cost depends heavily on whether you’re building a new dock or replacing the decking on an existing dock.
If you’re installing composite boards on an existing aluminum dock frame or wood dock frame that’s still structurally sound, substructure cost is minimal—maybe $200 to $500 for additional bracing or repairs. If you’re building from scratch or replacing a rotted wood frame, add $2,000 to $5,000 for a proper substructure.
Installation Labor: $1,200 to $2,500
Composite boards require careful installation. They expand and contract with temperature, so spacing is critical. They also need to be fastened with stainless steel hardware to avoid water damage and corrosion.
Professional installation typically costs $6 to $12 per square foot, so for a 192-square-foot dock, expect $1,200 to $2,300 in labor. Some contractors charge by the hour ($85 to $150 per hour), which usually comes out to 12 to 20 hours for a complete installation.
Hardware and Fasteners: $300 to $600
Stainless steel fasteners cost more than galvanized, but they’re necessary on Texas lakes to avoid rust stains and premature corrosion. This is especially important because rust blooming from fasteners can permanently stain composite boards.
Total Installed Cost: $5,700 to $11,500
For a typical residential dock with composite decking, budget $5,700 to $11,500 depending on dock size, existing structure, brand choice, and labor costs in your area.
Composite vs. Wood Dock Boards: Honest Comparison
Traditional pressure-treated wood is cheaper upfront. Wood boards cost $1 to $2 per linear foot, so material for the same 12-by-16-foot dock runs $400 to $900. Total installed cost for a wood dock is typically $3,000 to $6,000.
Sounds like a deal, right? Here’s the catch: wood rots. On Lake Travis, with its warm water, high humidity, and seasonal water level fluctuations, a wood dock typically needs significant repairs or complete replacement within 8 to 12 years. Repairs include replacing rotted boards ($500 to $2,000), treating rot, replacing fasteners, and managing splinters and safety issues.
So while wood is cheaper initially, a composite dock installed today will outlast two wood dock replacements, making composite cheaper over a 20-year period. Plus, composite requires virtually no maintenance, whereas wood requires annual treatment, staining, and splinter management.
If you’re planning to stay in your Lake Travis or Lake Austin property for more than 8 years, composite is almost always the smarter financial choice.
Composite vs. Aluminum Dock Decking: The Real Comparison
Aluminum is the third major option for dock decking. We’ve built hundreds of aluminum docks around Austin, and it’s worth understanding how composite stacks up against it.
Cost Comparison
Aluminum composite-deck systems (where composite boards are attached to aluminum frames) cost $8,000 to $15,000 for a typical 12-by-16-foot dock installed. That’s noticeably higher than composite-on-wood ($5,700 to $11,500) or aluminum-on-aluminum ($6,000 to $12,000).
Durability and Maintenance
Aluminum docks never rot or splinter. They handle temperature extremes better than composite. However, they require annual or biannual cleaning and maintenance to prevent algae buildup and corrosion.
Composite requires less maintenance than wood but more than aluminum. Most people find the maintenance level acceptable: a quick wash with a garden hose 2 to 3 times per year, and occasional deck cleaner if algae or mildew develops.
Aesthetics
This is highly subjective, but composite looks more like natural wood—which appeals to people who want that warm, natural appearance at their dock. Aluminum has a more industrial look. If you care about the visual appeal of your waterfront, composite wins.
Thermal Properties
This matters in Texas. Composite boards get noticeably warmer in direct sun than aluminum. On a 95-degree day in Lake Travis, a composite deck can be too hot to walk on barefoot, whereas aluminum stays cool. If you spend a lot of time barefoot on your dock, aluminum is the practical choice.
Longevity
A well-maintained aluminum dock can last 25+ years. A composite dock typically lasts 15 to 20 years before significant fading or degradation. Both are far superior to wood in the long run.
Why Texas Heat and Sun Are Hard on Composite
If you’ve heard warnings about composite decking in hot climates, there’s some truth there. Texas sun is intense, and composite fades and can become brittle over time if it’s not engineered for high UV exposure.
Here’s the real story: premium composite lines (Trex Transcend, TimberTech XLM, MoistureShield premium) are engineered specifically to handle hot climates and hold up well for 12 to 15+ years. Budget composites fade noticeably after 5 to 7 years.
So if you’re choosing composite for a Lake Travis dock, don’t cheap out on the product line. The difference between entry-level and premium is the difference between a dock that looks great for 8 years versus one that looks decent for 12 to 15. Given that you’re making a $6,000 to $10,000 investment, spending an extra $800 to $1,200 on better material makes sense.
Heat Retention: Know What You’re Getting
Composite does retain more heat than aluminum. Dark-colored composite boards can reach 140 to 150 degrees Fahrenheit on a 95-degree day. Light colors stay cooler. If heat is a concern, light gray or tan composite is better than dark brown or black.
Some people interpret this as a problem. We see it as a tradeoff: you get the natural wood look, but you pay for it with a warmer deck surface. Most customers find this acceptable.
Installation Considerations for Lake Travis and Hill Country Docks
Installing composite dock boards isn’t complicated, but there are specific considerations that matter in this region.
Water Level Fluctuations
Lake Travis sees 30 to 40 feet of seasonal variation. Your dock structure needs to accommodate this—either with a floating dock design or by building on pilings high enough to handle the variation. Composite boards themselves don’t care about water level changes, but your substructure does. Make sure whoever installs your dock accounts for this properly.
Temperature Expansion and Contraction
Composite expands in heat and contracts in cold. Texas temperatures swing from freezing in winter to 100 degrees in summer, so you need proper spacing and fastening. A 12-foot board can expand or contract by 1/4 to 1/2 inch across a year. Professional installers account for this with proper spacing at seams.
Water Drainage
Lake docks stay wet and humid. Your composite deck needs drainage to prevent pooling water and mold growth. Proper substructure with slight slope and adequate ventilation underneath is essential. Don’t skimp on this.
Stainless Steel Hardware Is Non-Negotiable
We always recommend stainless steel fasteners and hardware on Lake Travis docks. Galvanized hardware rusts and leaves permanent stains on composite. The extra $200 to $300 for stainless hardware is the cheapest insurance policy you can buy.
How Long Does Composite Decking Actually Last?
Honestly? It depends on the quality, climate, and care.
Premium composites in a well-maintained dock on Lake Travis typically last 15 to 20 years before significant degradation. By “significant,” we mean fading, potential surface cracking, or color washout. The board won’t fall apart, but it might not look as nice.
A composite deck that’s well-cared-for can last 20+ years. One that gets neglected (salt spray, no cleaning, poor drainage) might show wear after 10 to 12 years.
Compared to wood (8 to 12 years) or aluminum (25+ years), composite sits in the middle. You’re trading some longevity for the natural appearance and lower maintenance of wood without the rotting.
Common Mistakes People Make with Composite Docks
Choosing the Wrong Color for Texas Heat
Dark composite colors look beautiful but get extremely hot and fade faster. Light grays and tans are smarter for Lake Travis docks.
Installing Over Inadequate Substructure
Composite is heavier than wood, so it needs a properly designed frame. Don’t install premium composite decking over a substructure designed for lightweight materials.
Using Galvanized Instead of Stainless Hardware
This is a mistake we see repeatedly. Galvanized fasteners will rust, and rust stains on composite are nearly impossible to remove. The extra cost for stainless is minimal compared to the cost of fixing the staining problem later.
Ignoring Proper Spacing and Drainage
Composite needs room to expand. If boards are installed too tight or without proper drainage underneath, you’ll get mold, algae, and premature degradation. Good installation practices matter.
Buying the Cheapest Option
Budget composite works for sheds and light-use decks. For a dock where you spend time every weekend, spend the extra money on a better product line. It’ll look and perform better over 15 years.
Maintenance: What You Actually Have to Do
One of composite’s main selling points is low maintenance. Here’s what “low” actually means.
Yearly or Biannual Cleaning: Rinse with a garden hose and lightly scrub with a soft brush and deck cleaner if algae or mold has built up. Takes 30 minutes for a small dock.
Annual Inspection: Look for any loose fasteners, cracks, or swelling. Tighten fasteners if needed. Takes 15 minutes.
Never: You don’t need to seal, stain, or treat composite like wood. That’s the whole point—it’s low maintenance.
Compare this to a wood dock, which needs annual staining or sealing to prevent rot, and you’ll see why composite appeals to busy people. Compare it to an aluminum dock, which needs more frequent cleaning to prevent algae buildup, and composite looks better for the effort involved.
Warranties: What Actually Matters
Composite manufacturers offer 25 to 30-year warranties, but they’re limited warranties with conditions. A typical warranty covers structural defects but not fading, staining, or surface weathering.
Read the fine print. Some warranties have conditions like “must use the manufacturer’s recommended fasteners” or “requires annual maintenance.” Others have exclusions for commercial use or extreme climates.
Trex’s warranty is strong. TimberTech’s is solid. Fiberon’s is shorter on some product lines. Understand what’s covered before you buy, especially if your dock will get heavy use.
What to Expect from a Composite Dock Over 15 Years
Here’s a realistic timeline for a well-maintained composite dock on a Lake Travis property:
Years 1-3: Looks new. Minimal to no visible change. Requires just rinsing off occasionally.
Years 4-7: Color begins to fade slightly, especially on dark boards. Still looks good. Light algae growth in shady areas is normal.
Years 8-10: More noticeable fading and graying, particularly on darker colors. Surface may show minor weathering. Structurally sound. Still functional and safe.
Years 11-15: Significant color fading and weathering visible. If not maintained well, surface could show minor cracks or splintering. Still functional but probably due for replacement or restoration if appearance matters to you.
Beyond 15 years: Structural integrity depends on substructure condition. Boards may crack or become brittle in extreme heat cycles. Replacement becomes practical.
This timeline assumes normal Lake Travis weather (intense sun, humidity, occasional freeze cycles) and minimal maintenance. Better care extends this timeline.
Composite vs. Your Other Options: Quick Summary
Wood: Cheapest upfront, but rots within 8 to 12 years. Requires constant maintenance. Not recommended for Lake Travis docks.
Composite: Moderate upfront cost. Lasts 15 to 20 years with minimal maintenance. Looks natural. Requires less care than wood. Better value than aluminum for most residential uses.
Aluminum: Higher upfront cost. Lasts 25+ years. Never rots. Requires more frequent cleaning. More industrial appearance. Better for commercial applications and long-term ownership.
For most homeowners on Lake Travis and Lake Austin planning to stay 10+ years, composite is the smart choice. You’re paying a premium over wood, but you’re getting a dock that won’t rot, looks good, and requires minimal maintenance.
Getting Started with Your Composite Dock Project
If you’ve decided composite is right for your Lake Travis or Hill Country dock, the next step is getting a professional assessment of your dock situation and an estimate for the work.
When you contact a dock contractor, be ready to tell them:
- Your dock dimensions (length and width)
- Whether you’re replacing existing decking or building new
- What material your current substructure is made from
- Your preference for composite brand and color
- Your budget range
A good contractor will visit your dock, assess the substructure, account for water level variations, and give you a detailed quote in writing. Don’t trust phone estimates for dock work—every situation is different.
Ready to upgrade your dock with quality composite decking? Contact Longhorn Docks for a free dock consultation. Call us at (512) 200-4244 or fill out our online consultation request. We’ll assess your dock, explain all your material options including composite versus aluminum, and provide a detailed quote for the project. Let’s build you a dock that looks great for years to come.