Paver Patios: When to Clean, When to Re-Sand, and When to Seal
Weeds in the joints, pavers shifting underfoot, colour looking washed out. Each symptom points to a different fix. Here is how to tell which one your patio actually needs.
Paver patios and driveways are built to last decades. What does not last decades is the polymeric sand in the joints, and almost every paver problem homeowners notice traces back to it.
Knowing which symptom you have tells you which job you actually need, and the price difference between them is significant.
The three jobs, and what each one fixes
1. Cleaning
What it fixes: surface dirt, algae film, leaf tannin staining, and that grey-green cast that makes pavers look faded.
Here is the thing most people get wrong: pavers rarely fade as much as you think they have. Concrete pavers are pigmented throughout, not just on the surface. What looks like fading is almost always a film of dirt and organic growth sitting on top of the stone. Clean it off and the colour is still there.
If your patio looks dull but the joints are firm and the surface is level, cleaning alone may be all it needs.
2. Re-sanding
What it fixes: weeds, ants, shifting pavers, and joints you can see daylight through.
Polymeric sand is what locks the field together. Over ten or fifteen years it washes out through rain, pressure washing, and ordinary drainage. Once the joints are open:
- Weeds arrive, because there is now soil and light in the gap
- Ants move in and excavate further
- Pavers shift under foot and vehicle load, because nothing is holding them in place laterally
- Edges start to sink, which is the beginning of a much more expensive repair
If you are pulling weeds out of your patio every spring, the weeds are not the problem. The missing joint sand is.
3. Sealing
What it fixes: future staining, and it locks in the work above.
A quality sealer resists oil, leaf tannin and efflorescence, helps hold the fresh joint sand in place, and makes every subsequent cleaning dramatically easier. You can choose a natural-look penetrating sealer or a wet-look finish that deepens the colour noticeably.
Sealing is the last step, never the first. Sealing a dirty patio permanently locks the dirt in.
How to diagnose yours in two minutes
Walk out and check three things:
Run a screwdriver into a joint. If it sinks in easily or the sand is loose and grainy, the joints need re-sanding. If it is firm and resists, they are still doing their job.
Step on a few pavers, especially near edges and corners. Any rocking or movement means the field has lost its lateral lock.
Pour a cup of water on the surface. If it beads, there is still sealer working. If it soaks straight in and darkens the paver, the surface is unsealed or the sealer has worn off.
From that:
- Firm joints, no movement, water beads → cleaning only
- Loose joints or weeds → clean and re-sand
- Loose joints and water soaks in → full restoration: clean, re-sand, seal
Why full restoration takes more than a day
This is the part that surprises people, so it is worth being clear.
Pavers have to be completely dry before sand and sealer go down. Sealing damp pavers traps moisture underneath and produces a hazy white blush that can only be fixed by stripping the sealer and starting over.
In Georgia humidity that drying window is usually 24 to 48 hours, sometimes longer. Any contractor offering to clean, re-sand and seal your patio in a single afternoon is skipping a step you will pay for later.
Common mistakes
Pressure washing the joints out. Aggressive high-pressure cleaning blasts away whatever polymeric sand was left. If you clean pavers yourself, expect to re-sand afterward.
Using play sand instead of polymeric. Regular sand does not bind. It washes straight back out and the weeds return within a season.
Sealing over efflorescence. That white chalky bloom is mineral salts migrating out of the paver. It needs a specific treatment first. Sealing over it locks it in permanently.
Waiting until pavers sink. Re-sanding is straightforward maintenance. Lifting, re-basing and relaying a sunken section is a different scale of job entirely. Deal with open joints while they are still just open joints.
A note on larger properties
Extensive paver installations (the kind common through Kennesaw and the Marietta Country Club area, and across the larger lots in Canton) are exactly where full restoration pays off most. There is simply more of it, and the difference between a tired paver field and a properly restored, sealed one changes how the whole property reads.
Full restoration projects start at around $1,500 depending on square footage, how much joint sand needs replacing, and which sealer finish you want.
Not sure which of the three jobs yours needs? Send a few photos, including a close-up of the joints, and we will tell you straight, including if the answer is that it can wait another year.
Keep reading
- How Much Does Pressure Washing Cost in the Atlanta Metro?Real pricing for house washing, driveways, roofs, decks and paver restoration around Acworth, Kennesaw and Marietta, including why the cheapest quote is usually the most expensive one.
- When Is the Best Time of Year to Pressure Wash in Georgia?Spring after the pollen drops is the obvious answer, and it is also the busiest and most expensive time to book. Here is what each season is actually good for in the Atlanta metro.
- How Often Should a Deck Be Cleaned and Sealed in Georgia?Grey, blotchy boards are not worn out wood. It is a thin damaged surface layer hiding sound timber underneath. Here is the realistic schedule for a deck in the Georgia climate, and the mistake that ruins the most decks.
