Composite vs. Wood Decking in the Triangle Climate

Walk through any Triangle subdivision and you'll see the full life cycle of wood decks: new yellow-green pressure-treated boards, gray weathered decks with raised grain, and older ones that have been re-stained a dozen times. Composite has taken a big share of new decks and re-decks. Which is right depends on your budget, your shade and how much maintenance you're willing to do.

Installed costs

HomeGuide's deck cost guide (February 10, 2026) gives these national installed ranges for a complete deck:

Framing is almost always pressure-treated lumber regardless of the decking on top, so the decking choice affects the surface, rails and long-term upkeep more than the structure.

Pressure-treated pine

Pros: lowest cost, easy to repair, widely available, and familiar to every deck builder.

Cons in this climate: boards check, split and warp as they cycle between wet and dry. Summer humidity and shade encourage mildew, and spring pollen settles into the grain. Plan on cleaning and applying a penetrating stain or sealer every few years, and replacing the occasional board.

Tip: let new treated lumber dry before staining, following the stain maker's guidance.

Cedar

Lighter and more naturally rot-resistant than untreated pine, with a warm color that weathers to gray. It's softer, so it dents more easily, and it still needs finishing to keep its color. Cedar is less common on Triangle decks than pine or composite but is popular for railings and screened porch trim.

Composite and PVC

Pros: no staining, consistent color, no splinters, and resistance to rot and insects. Most products carry long manufacturer warranties.

Cons: the highest cost, and some practical issues:

• Heat. Dark composite boards can get hot in direct afternoon sun in July and August. Lighter colors or a shaded location help.
• Mildew. Composite doesn't rot, but mildew can grow on surface dirt and pollen in shady, damp spots. Rinse it in spring.
• Expansion. Boards expand and contract with temperature; follow gap and fastener instructions.
• Framing still matters. Composite boards often outlast the treated framing below them unless the joists are protected.

Framing details that decide how long it lasts

Whatever surface you choose:

• Joist tape on top of joists and beams sheds water from the most vulnerable spots.
• Ledger flashing where the deck meets the house is critical. Rot at the ledger is a common cause of deck failure.
• Fasteners and connectors rated for treated lumber.
• Footings sized for the load and for Triangle clay, which holds water and moves.
• Ventilation under low decks to let boards dry.

Re-decking an existing deck

If your framing is sound, replacing just the boards can be a big upgrade. North Carolina's G.S. 160D-1110(c) says no permit is required to replace the pickets, railings, stair treads and decking of porches and decks for single-family jobs of $40,000 or less. Replacing joists, beams, posts or footings is load-bearing work and does need a permit. Some towns publish their own guidance; Cary lists deck boards, pickets, railings and treads as permit-free but requires a permit for all decks. See Cary decks.

Have someone check the framing before ordering composite. Putting 25-year boards on 20-year-old joists can mean tearing them off sooner than you'd like.

HOA considerations

Many subdivisions in Apex, Cary, Holly Springs and Wake Forest require architectural approval for decks and sometimes for color changes. Ask before ordering. See Apex.

Railings and stairs

Railings take the most hand contact and the most weather. Options include treated wood, cedar, composite sleeves over wood posts, aluminum and cable. Aluminum and composite systems cost more but need little upkeep; wood is easiest to customize and repair. Stairs are where slips happen, so look at the texture of composite treads and keep wood treads clean of mildew. Guards and stair dimensions have code requirements, which an inspector checks on permitted decks.

Quick guide

• Lowest cost, don't mind upkeep: pressure-treated pine.
• Low upkeep, shaded or partly shaded deck: composite in a lighter color.
• Full sun, west-facing: light composite, PVC, or wood.
• Screened porch floors: composite or treated wood both work; screens cut pollen and leaves.

For costs, permits and how to vet a builder, see our porches and decks guide.