Composite vs. Wood Decking in the Florida Climate

The question is not which lasts longer

The comparison usually gets framed as durability, and that framing is unhelpful, because in Florida both materials outlast the enthusiasm of the person maintaining them.

The useful question is: which deck will you actually enjoy using in five years?

That reduces to two things — how hot the surface gets in the afternoon, and whether the maintenance it needs is maintenance you will do.

What Florida does to timber

Pressure-treated southern yellow pine is a good material. It is strong, available everywhere, repairable board by board, and inexpensive. It is also, in this climate, on a maintenance clock.

Intense UV breaks down the surface. Humidity and heavy summer rain cycle moisture in and out of the boards. The combination raises the grain, opens checks and eventually produces splinters. A treated deck that is cleaned and resealed regularly looks excellent and stays comfortable. One that is not looks grey and rough within a few years, and is unpleasant barefoot.

Here is the honest part. The resealing interval in Northeast Florida is shorter than product labels suggest, because the conditions here are harder than the conditions products are tested against. It also needs a dry window of a couple of days, which summer does not readily supply. Most owners intend to keep up with it. A smaller number actually do.

What composite changes

Capped composite — a wood-and-polymer core with a protective polymer shell — removes that cycle. It does not splinter. It does not need sealing. Maintenance is washing it.

The cap is the part that matters in this climate. Uncapped composite is cheaper and is more prone to staining and fading. Capped products resist both, and the difference over a decade of Florida UV is substantial. If you are considering composite here, consider capped composite.

Heat is the deciding factor more often than cost

This is the issue that produces the most regret, and it is entirely avoidable at specification time.

Every decking surface in full Florida sun gets hot. The variables that move the number are:

• Colour. Lighter is cooler, by a meaningful margin. This is the single biggest lever.
• Orientation. West-facing afternoon exposure is the worst case.
• Shade. A roof, pergola or mature tree transforms the situation.

A dark composite deck in full western exposure can be uncomfortable barefoot through the middle of the day. The same board in a light tone, or the same dark board under a pergola, is fine.

Our standard advice: decide surface temperature first, then choose the product that delivers it within budget. A deck nobody uses in July is not a saving.

Cost over the time you will own it

Composite costs more per square foot to install. Over a short horizon, timber is clearly cheaper.

Over ten years or more the comparison shifts, once you count cleaning materials, sealer, replacement boards and — if you value it — your own time. Whether composite comes out ahead depends on how diligently you would have maintained the timber. For an owner who seals on schedule, timber is competitive. For one who does not, composite is cheaper and looks better the entire time.

The frame is timber either way

Worth stating plainly, because marketing sometimes obscures it: a composite deck has a pressure-treated timber frame. Composite is a surface decision, not a structural one.

Everything about footing depth, ledger attachment and flashing, post sizing and hardware specification is the same problem under either material. The one structural difference is joist spacing — composite generally requires tighter spacing than timber decking, which matters when resurfacing an older frame.

Where each one wins

Choose treated timber when the budget is the binding constraint, when you genuinely will maintain it, when you want to repair with materials from any lumber yard, or when the deck is a utility space rather than a lounging one.

Choose composite when the deck is used barefoot, when children or dogs use it, when you do not want an annual project, when the deck is hard to access for maintenance, or when you plan to own the property long enough for total cost of ownership to matter.

Mix them when it suits the use — which, on waterfront projects, it frequently does. Treated timber along a walkway people pass through, composite on the platform where they stand, sit and go barefoot. It is a sensible way to put the money where it is felt.

More on each: composite decking and wood decks.