Composite Versus Pressure-Treated Decks

Pressure-treated wood

Pressure-treated southern yellow pine is the most common deck material in the region. It's strong, widely available and easy to repair. It needs regular cleaning and sealing or staining to slow weathering, cracking and splintering, and boards can twist or check as they dry.

Composite decking

Composite boards combine wood fiber and plastic, often with a protective outer shell. They don't need staining, resist splintering, and keep a consistent color with routine cleaning. They cost more upfront and can get hot in direct summer sun, especially darker colors. Each brand has its own installation rules, including joist spacing and fasteners, that must be followed.

Side by side

• Upkeep: wood needs periodic sealing or staining; composite needs cleaning
• Appearance: wood weathers and can be stained; composite keeps its color
• Heat: both warm up in sun; dark composite can get noticeably hot
• Upfront cost: wood is generally less; composite is generally more
• Repairs: wood boards are easy to replace; composite should match the original product line

For a deeper comparison, see composite vs PVC vs pressure-treated decking.

The framing matters either way

Composite decking does not make a deck rot-proof. The framing underneath is almost always pressure-treated wood, and it's what holds the deck up. Joist tape, proper flashing at the ledger and correct footings protect the structure. See deck joist tape, ledger attachment and footing depth.

Railings and code

Both materials pair with wood, composite, aluminum or other railing systems. Railings must meet the North Carolina building code for height and opening size; see deck railing codes.

Care and cleaning

Every deck needs some care. Wood decks should be cleaned and resealed or restained periodically, with any loose fasteners reset and cracked boards replaced. Composite decks should be swept and washed to remove pollen, dirt and mildew, which can grow in shaded, damp areas. On both, keep leaves and debris out of board gaps so water can drain and air can move under the deck. Check stairs, railings and the ledger connection to the house every year, whatever the decking material.

• Sweep and wash regularly
• Keep board gaps clear
• Check railings and stairs each year
• Reseal or restain wood as it weathers

Shade, sun and location

How your deck faces the sun affects both materials. South- and west-facing decks get the most heat and UV, which fades and weathers wood faster and makes darker composite boards hotter underfoot. Shaded decks stay cooler but stay damp longer, which can encourage mildew on both. Lighter colors stay cooler in full sun. If the deck is close to the ground, plan for airflow and drainage underneath — see stone beneath decks.

Fasteners and hardware

Decking material affects the fasteners and hardware used. Pressure-treated lumber is corrosive to some metals, so screws, nails, joist hangers and connectors must be rated for treated wood. Composite boards often use hidden clip systems or color-matched screws recommended by the manufacturer, and using the wrong fasteners can affect performance. Whatever the material, the structural connections — ledger bolts, post bases, beam connections and hangers — must meet code and be installed correctly. These details matter as much as the boards you walk on.

How to choose

Think about how much upkeep you want, how the deck faces the sun, how long you plan to stay and your budget. We'll show you options and include the material in a written estimate. Learn more about our deck building and decks and outdoor living services.

Frequently Asked Questions

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