What Trex is and how it differs from pressure-treated wood
Trex is a composite decking material made from wood fibers and plastic, manufactured by the Trex Company. Unlike pressure-treated lumber, which is solid wood chemically treated to resist rot and insects, Trex boards are engineered composites that contain no actual wood on the surface — only a plastic shell surrounding a wood-plastic core.
The key difference shows up in maintenance and longevity. Pressure-treated wood requires regular staining or sealing every two to three years to prevent weathering, splintering, and rot. Trex requires no staining, sealing, or painting. It does not splinter, and the manufacturer states it resists fading, staining, and mold better than wood over time.
Pressure-treated wood costs less upfront — typically $2 to $5 per linear foot for boards, compared to $8 to $15 per linear foot for Trex, depending on the specific product line and where you buy. Over a 20-year lifespan, the maintenance costs for wood can narrow that gap significantly.
Key Takeaways
- Trex composite decking contains wood fibers and plastic, requires no staining or sealing, and resists splintering and mold better than pressure-treated wood.
- Trex costs two to three times more per board than pressure-treated lumber but eliminates the need for regular maintenance sealing every few years.
- Trex boards are softer than wood and can dent or gouge under heavy impact, and some colors fade more noticeably in direct sunlight than others.
- Trex decks still require fasteners, flashing, and structural support identical to wood decks, so the savings explore only to the surface material itself.
- Trex produces more heat than wood in direct sun and can expand and contract with temperature changes, requiring specific spacing and installation techniques.
Trex product lines and what each one offers
Trex makes several product lines at different price points. Trex Select is the entry-level option, made from a lower percentage of recycled plastic and wood. Trex Enhance sits in the middle and includes better stain and fade resistance. Trex Transcend is the premium line with the thickest protective shell and the widest color range.
Within each line, boards come in different profiles — standard grooved boards, square-edge boards, and boards with a wood-grain texture. The grooved underside helps with water drainage and is standard on most residential decks. Solid or near-solid undersides cost more and are typically used on covered or shaded areas where drainage is less critical.
Trex also makes railing systems, fascia boards, and trim pieces designed to work with its decking. These components are made from the same composite material and follow the same maintenance-free principle as the deck boards themselves.
Installation differences between Trex and wood
Trex installation follows the same basic framing and joist structure as wood decking — you still need pressure-treated lumber for the frame, posts, and support. The difference appears in how the boards attach and how they respond to temperature.
Trex expands and contracts more than wood with temperature swings. Installers must leave larger gaps between boards (typically 1/8 inch in cold weather, 1/4 inch in warm weather) to allow for this movement. Fasteners must be stainless steel or coated to prevent rust stains on the composite surface. Some builders use hidden fastening systems designed specifically for Trex to avoid visible screw heads.
Trex boards are softer than wood and can dent or gouge if struck with a heavy object. They also absorb and retain heat more than wood, making them noticeably hot underfoot in direct summer sun. Some installers recommend light-colored Trex in very sunny climates for this reason.
Staining, mold, and fade resistance compared to wood
Pressure-treated wood is prone to mold and mildew growth in damp climates, especially on the shaded underside of boards. It also absorbs stains from leaves, dirt, and organic matter. Trex resists mold growth because the plastic shell does not absorb water the way wood does, and its non-porous surface sheds most stains.
However, Trex can still develop mold or mildew if debris accumulates and stays wet for extended periods. It also fades over time, particularly in darker colors and in direct, unshaded sun. Lighter Trex colors fade less noticeably than darker ones. The manufacturer publishes fade ratings for each color, and some colors are rated as more fade-resistant than others.
Trex can be cleaned with a pressure washer on a low setting or with a soft brush and mild detergent. Unlike wood, it does not need to be sealed afterward. Stubborn stains may require a specialized composite deck cleaner, but routine maintenance is a rinse rather than a refinish.
Cost breakdown: materials, installation, and long-term maintenance
A typical 16-by-20-foot deck (320 square feet) costs roughly $3,200 to $4,800 in Trex materials alone, compared to $800 to $1,600 for pressure-treated wood. Installation labor is similar for both — typically $8 to $15 per square foot — because the framing and fastening process is comparable.
The maintenance cost difference emerges over time. Pressure-treated wood decks usually need sealing or staining every two to three years, which costs $400 to $1,200 per process for a 320-square-foot deck. Over 20 years, that adds up to $2,700 to $8,000 in maintenance labor and materials. Trex requires no sealing, staining, or painting, only occasional cleaning.
Trex boards do not rot or splinter, so they typically last 25 to 30 years with no structural replacement of the surface boards. Pressure-treated wood typically lasts 15 to 20 years before boards begin to fail and need replacement. The structural frame (joists, posts, beams) lasts longer in both cases and is usually the limiting factor for deck lifespan.
Limitations and situations where wood may be the better choice
Trex is not the right choice for every deck. If budget is the primary concern and you are willing to maintain the deck regularly, pressure-treated wood is significantly cheaper upfront. If you plan to sell the house within five to ten years, the maintenance savings may not offset the higher initial cost.
Trex also performs differently in extreme climates. In very hot, sunny regions, the heat retention and expansion can be problematic. In very cold regions, the brittleness of the plastic component can increase the risk of cracking under impact. Some builders in these climates prefer wood or hybrid materials.
Trex is also heavier than wood, which can matter if you are building a deck on an existing structure or in a location where weight is a concern. A Trex board weighs roughly 50 percent more than a comparable wood board, so the entire deck frame must be designed to handle the additional load.
Trex versus other composite and alternative decking materials
Trex is the largest composite decking brand by market share, but other manufacturers make similar products. TimberTech (owned by Azek) and Fiberon are the other major composite brands. All three use similar wood-plastic composite construction and offer comparable fade and mold resistance.
The differences between brands are usually in color selection, texture options, and specific performance ratings. TimberTech and Fiberon publish similar fade and stain resistance data. Prices are comparable across brands, though regional availability and dealer networks vary.
Aluminum decking (made from extruded aluminum frames with composite or wood infill) is another option, typically more expensive than composite but lighter and more durable in extreme climates. PVC decking (solid plastic with no wood content) is also available and resists staining and fading better than wood-plastic composites, but costs more and is less common in residential applications.
Frequently Asked Questions
Does Trex need to be sealed or stained?
No. Trex requires no sealing, staining, or painting. The plastic shell is designed to protect the wood-plastic core without additional coatings. Routine cleaning with a soft brush or low-pressure water rinse is the only regular maintenance needed.
Can Trex be used for the frame and support structure, or only the surface boards?
Trex is used only for the surface boards and trim. The frame, joists, posts, and beams must be pressure-treated wood or another structural lumber rated for ground contact. Composite materials are not rated for the structural loads that support a deck.
How much hotter does Trex get than wood in the sun?
Trex can be 10 to 15 degrees Fahrenheit hotter than wood in direct summer sun, depending on color and local conditions. Lighter colors absorb less heat than darker ones. This is a common complaint in very sunny climates and may affect barefoot comfort in peak afternoon hours.
Will Trex crack or splinter over time?
Trex does not splinter like wood does. It can crack under extreme impact or in very cold climates where the plastic becomes brittle, but this is less common than wood splintering. Minor gouges and dents are possible but do not compromise the deck's structural integrity.
Is Trex more environmentally friendly than pressure-treated wood?
Trex uses recycled plastic and reclaimed wood fibers, which diverts waste from landfills. However, it is a petroleum-based product and requires manufacturing energy. Pressure-treated wood is a renewable resource but requires chemical treatment and regular maintenance sealing. The environmental comparison depends on which factors matter most to you.