Composite vs. PVC vs. Pressure-Treated Pine: Real Summer Heat, Scratching, and Span Limits
Decking choice is the biggest visual and budget decision in a new deck. In North Carolina the decision is shaped by three local realities: brutal roof-deck-level summer heat, tree-filled yards that scratch and stain, and joist spans that not every premium board can handle.
Here is the practical comparison AGCS walks clients through.
Pressure-Treated Pine: The Value Baseline
Treated southern yellow pine remains the most affordable board and the only option that takes stain color customization each season. It spans generously (a 2x6 pine joists at 16-inch centers is routine), holds fasteners well, and is forgiving to work with.
Its cost is maintenance: washing and staining every 2 to 3 years, occasional board replacement, checking and splinters as it weathers. Left unprotected it silvers and cracks within a few years.
Composite (Capped Wood-Plastic): Low Maintenance, Real Heat
Composite boards blend wood fiber with recycled plastic under a polymer cap. They never need staining and resist rot and insects completely—termites are irrelevant to the board itself.
Two real-world caveats: dark-colored composites absorb serious heat (dark gray boards have hit 150+ degrees on Piedmont July afternoons—barefoot comfort is a real constraint), and wood-fiber composites can scratch and show fade lines from patio furniture and pet claws. Lighter colors mitigate heat.
Most composite boards require 16-inch joist spacing (some premium lines allow 20); check the span table or the warranty is void.
PVC / All-Plastic: Coolest Technology, Highest Cost
All-PVC boards (e.g., solid cellular PVC) contain no wood fiber, so they resist staining, scratching, and moisture absorption at the highest level, and lighter-toned PVC lines stay noticeably cooler than equivalent composites. Many carry 25-to-50-year fade and stain warranties.
PVC costs the most, expands and contracts more with temperature (requiring proper gapping), and shares the same span restrictions as composite.
The Honest Decision Framework
Maximum budget value and a hands-on owner: treated pine. Low maintenance with balanced cost: capped composite in a lighter color. Maximum stain/scratch resistance and pool-adjacent use: PVC. Full sun exposure tilts toward lighter colors in every category; heavy tree cover tilts toward PVC.
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