The sand is not filler
Of all the work we photograph, re-sanding appears in more captions than almost anything else, and it is still the step homeowners know least about. Most people think of the sand between pavers as something that happens to be there. It is doing a job, and when it is gone the surface starts to come apart.
An interlocking pavement works by interlocking. Each paver is held by the ones around it, and what transfers the load between them is the sand in the joint. Take it away and every paver is an independent block sitting on sand, free to rock, tilt and grind its edges against its neighbors.
What empty joints actually cause
- Rocking pavers, which is the first thing you feel underfoot.
- Weeds, because an empty joint is a planter. Seeds land in it and there is nothing stopping them.
- Ants, which move sand up and out, accelerating everything else.
- Edge damage. Pavers that move grind against each other and chip along the top edge. Unlike most paver problems, this one is not reversible.
- Sinking, eventually, because a surface with no interlock spreads.
Why it washes out faster here
Everywhere loses joint sand slowly. Southwest Florida loses it quickly, for reasons that are all about water:
- Wet-season rain arrives hard rather than gently, and runs across the surface instead of soaking in.
- Pool decks get splashed and hosed constantly, which is why they lose sand faster than anything else on a property.
- Driveway aprons at the street lose it fastest of all, because that is where all the surface water is heading.
- Pressure washing removes it. This is worth saying plainly: a proper pressure wash will strip joint sand out, and that is expected. Which is exactly why re-sanding belongs in the same visit and not as an optional extra.
Regular sand or polymeric
Regular sand is cheap, easy to top up, and washes out again.
Polymeric sand has a binder mixed through it. Swept into the joints and then activated with a light watering, it sets firm. It stays put through the rain, resists weeds and ants far better, and is what we use on installations we intend to last.
It is not magic. It needs the joints properly cleaned out first, it needs the right amount of water — too little and it never binds, too much and the binder floats to the surface as a haze — and it needs the surface to be dry when it goes in. Done wrong it is worse than plain sand, which is most of the reason it has a mixed reputation among people who have watched it fail once.
The part nobody mentions: sand has a color
This is the detail that changes how a finished job looks, and almost nobody is offered the choice.
Joint sand comes in colors, and the default on most quotes is a generic grey. On a red or a buff-toned paver, grey joints read as dirty grout lines and they visually break up the surface. Get the tone close to the paver and the whole area reads as one continuous surface instead of a grid.
We have matched Oxford grey sand to a customer’s color scheme on a driveway and again on a pool deck, because that was what their pavers and their home wanted. It costs no more to choose. It just has to be chosen before the job rather than after.
What to ask whoever is quoting you
Three questions, and the answers tell you a great deal:
- “Is re-sanding included, or is it extra?” If a clean-and-seal quote does not include re-sanding, it is sealing a surface with empty joints.
- “Polymeric or regular, and why for my surface?” There is a right answer per property. The absence of a reason is the warning sign, not the choice itself.
- “What color, and can I see it against my paver?” Watch whether it has occurred to them.
How this fits the rest of the job
Re-sanding sits in the middle of the sequence: anything sunken is reset first, the surface is washed, the joints are re-sanded, and only then is it sealed. Skip the sand and the seal on top of empty joints has nothing to key into at the edges — which is one of the reasons a coat later fails and has to be stripped.