Polymeric sanding looks simple from the outside, brush some sand into the joints and mist it with water, but the order and timing of each step is what decides whether it holds for years or fails within a season. This guide walks through exactly what happens on your property, day by day.
It is usually a two day job. Day one is the wash, day two is the sand, and the gap between them exists for a real reason, not just scheduling convenience.
Knowing what each step is actually for also makes it easier to spot a job that was rushed, whether that is ours or anyone else's, so we would rather explain it in full than leave it vague.
Day one: the wash
We start by pressure washing between every crack and across the face of the stones, blasting out the old sand, weeds, dirt and any hidden ant activity sitting in the joints. This is not a quick rinse, it is a thorough clean of every joint on the surface, since anything left behind will undermine the new sand we pack in on day two. The colour of the stone itself also comes back noticeably during this step, even before any sand goes in.
Why it has to dry fully before day two
Once the wash is done, the surface has to dry completely before we touch it again. Wet joints ruin polymeric sand, since the binder in the sand needs to bond properly in a dry environment before it gets set with water in a controlled way. We never rush this part, even if it means the job stretches into a third day depending on how fast the property dries and what the weather is doing. Our guide on the best time to pressure wash in Toronto covers how we schedule around that.
Day two: the sand goes in
Once everything is fully dry, we brush new polymeric sand into every joint until it is packed full and level, compacting it in as we go. Then we settle it and blow off every bit of loose sand from the surface so nothing hazes or bonds onto the face of the stones themselves, which is what leaves that dusty film on jobs done without this step and skipped in a rush.
Finally, we mist the joints with water in light passes so the sand hardens in place. It never gets flooded, since too much water at once can wash the sand right back out of the joint before it has a chance to set, undoing the entire two days of work in a matter of minutes if it is handled carelessly.
The sand we use, and matching your colour
We use Sika polymeric sand as standard, or Alliance Gator if you would rather, which costs a bit more. Either way, we match the colour to what is already on your property so you never have to remember or track down the original shade yourself, and the new joints blend in rather than standing out against the surrounding stone.
The last 24 hours
Once the sand is misted in, stay off the surface entirely, no walking and no driving. 24 hours off the surface is usually enough for it to set, and we confirm the exact timing on the day since weather plays a real part in how fast it cures. After that, the joints lock hard, the weeds stop and any ant activity in the joints generally moves on, since there is no loose material left for them to work with. It is usually good for 3 to 5 years under our seasonal guarantee.
What is included beyond the sand itself
Every job includes before and after photos, so you have a record of the driveway or patio before we touched it and after the joints were locked back down, which is worth having if you ever want to show a future buyer or your own memory what the work actually involved. Before we leave on day two, we walk the whole job with you, and if anything is not right, we fix it right then rather than leaving it for a return visit.
If weather does not cooperate partway through, whether that is rain rolling in before day two or the surface taking longer than expected to dry, we move the remaining step to the next clear day and confirm with you. That never counts as a cancellation and never costs you anything, since rushing a wet joint is exactly the shortcut that causes early failure.
What this process is not
It is worth saying plainly what polymeric sanding does not do. We do not relay or relevel whole sections of sunken or uneven pavers, that is a landscaping job outside what we take on. If a few individual stones have shifted or sunk, mention it when we come by and we will take a look and tell you honestly whether it is something we can address as part of the visit.
It is also not a substitute for a full driveway rebuild if the base underneath has genuinely failed. What it does extremely well is restore joints that have simply lost their original sand over time, which is what these calls for weeds, ants, wobbling stones and washed out joints usually turn out to be rather than a bigger rebuild.
