Shellcrete vs. pavers for a Florida pool deck

Pavers are the default pool deck on the Gulf Coast, and for good reasons: they are quick to lay, a damaged one lifts out in ten minutes, and every crew in Florida knows how to install them. Shellcrete is a poured surface. The honest comparison is not which is better — it is which failure mode you would rather live with.

They fail in opposite directions

A paver deck is thousands of separate pieces sitting on a compacted base. It does not crack, because there is nothing continuous to crack. What it does instead is move. Sand washes out of the joints, the base settles unevenly under one corner, a sabal palm root lifts a section, and eight years in you have a deck that is no longer flat. Weeds and ants live in the joints. None of that is a defect; it is what a flexible system does.

A Shellcrete deck is a single continuous surface. It will not shift and it has no joints to weed. What it can do is crack — which is why it is placed in panels with control joints cut into it, so that any movement is taken up at a line somebody chose rather than a line the slab chose.

If you would rather have one hairline you can point to than four hundred joints you have to maintain, that is an argument for the poured surface. If you would rather be able to lift and replace one square foot, that is an argument for pavers, and it is a real one.

Heat

This is where the difference is largest and most people underestimate it. A surface's temperature under Florida sun is driven mostly by how much light it reflects. A pale, shell-flecked surface reflects a great deal; a charcoal or terracotta paver reflects very little and can become genuinely painful to stand on in July and August.

Light-coloured pavers close most of that gap. If you are comparing Shellcrete to a white or shell-toned paver, heat is close to a wash and you should decide on other grounds. If you are comparing it to the dark grey that has been fashionable for a decade, it is not close.

Grip

Both can be specified to grip well when wet and both can be specified badly. On a poured shell surface the grip comes from how far the surface is opened up during finishing — the exposed-shell finish has the most texture and the polished finish the least, which is why we do not put a high polish on a deck that runs right to the water's edge.

Sealed pavers can become slick. Ask any contractor what sealer they are using and whether it has a grip additive; if the answer is vague, that is the answer.

Where the money goes

Pavers usually come in lower on the initial quote. A poured shell topping is mostly labour and finishing time, and there is no way to make a hand-finished surface cheap.

The comparison changes over ten years. Paver decks in this climate typically need re-sanding and periodic releveling; a poured surface needs resealing on a schedule and nothing else until it does not. Neither is maintenance-free, and any contractor who tells you their surface is should be asked what happens at year eight.

Over an existing slab

If you already have a sound concrete pool deck, this is often the deciding factor. A shell topping can frequently go straight over it, which removes demolition, disposal and a week of the schedule. Pavers over an existing slab usually mean taking the slab out or building up a height that fights your door thresholds and pool coping.

"Sound" is doing real work in that sentence. A slab with active structural cracking, or one that is moving because what is under it is moving, has to be dealt with first. A topping follows whatever is beneath it.

The short version

Choose pavers if you want individual pieces you can lift, the lowest opening number, or you are starting from bare ground with no slab worth keeping.

Choose a poured shell surface if you want a continuous surface with no joints to maintain, you are working over a sound existing slab, or you want the coolest surface underfoot that is not a plain white deck.