Looking After Hardscaping Through a Long Island Winter

Good hardscaping needs very little maintenance, and a fair amount of what gets sold as maintenance does more harm than good. Here’s what’s worth doing, what isn’t, and what to leave alone entirely.

The seasonal short version

Autumn. Clear leaves off paved surfaces before they mat down and stain. Check that any drain outlet behind a retaining wall is clear. Drain down anything that holds water: an outdoor kitchen sink line in particular.

Winter. Choose your de-icer carefully (below). Plough or shovel with something that won’t gouge. Don’t pile snow against a retaining wall if you can help it: melting snow is water going into the ground behind it.

Spring. Walk the property and look for what moved. Top up joint sand where it’s low. Note anything that’s cracked in the same place as last year.

Summer. Almost nothing. Wash paving if you want to. Don’t seal anything just because a flyer arrived.

De-icing salt is the thing to get right

This is the highest-value item on the page, because it’s a cheap decision with an expensive consequence.

Rock salt (sodium chloride) is the common one and it’s hard on concrete and masonry. The damage isn’t chemical in the way people assume. It’s mechanical. Salt increases the number of freeze-thaw cycles a surface goes through and drives water into the material, and it’s the freezing water expanding inside the pore structure that pops the face off. Spalling on a concrete step or a paver surface is very often a salt story.

Calcium magnesium acetate (CMA) is materially gentler on concrete and masonry, though it’s more expensive and less effective at very low temperatures.

Sand doesn’t melt anything but it gives you traction immediately and does no damage at all. On a paver surface it also ends up in the joints, which is fine.

New concrete and new mortar are the vulnerable ones. Freshly placed material has not fully gained strength and is considerably more susceptible in its first winter. If you’ve had steps or masonry done this year, keep salt off them entirely this season.

Joint sand

Polymeric joint sand is what locks a paver field together, and it’s the one consumable in the system.

It depletes slowly: pressure washing takes it out fastest, which is one reason to be careful with a washer near joints. Low joints let the pavers move slightly against each other, which accelerates further loss, so topping up when you notice it is worth doing rather than leaving.

Weeds in the joints are usually not what people think. Seed blown in from above germinates in the top of the joint; it isn’t coming up from below through the base. It brushes out. It’s a sign the joint surface has degraded rather than a sign of a failed installation.

Sealing: less than you’re told

Sealing paving is optional. It deepens colour, makes the surface easier to clean and offers some stain resistance. It does not make a patio last longer in any structural sense, and it is sold far more often than it’s needed.

If you do seal, wait. New pavers need to weather first: sealing too early traps efflorescence under the film and you’ll be looking at it for years.

Asphalt sealcoating is the one where over-application is a real problem. A new driveway needs to cure before it’s sealed at all, and a contractor offering to seal a brand-new driveway is selling you something. After that, sealing on a sensible cycle protects the binder, but repeated coats build a thick, brittle skin that cracks on its own, independently of the asphalt underneath. Less often than the flyers suggest.

Efflorescence is not a defect

The white bloom that appears on new concrete pavers is lime working its way out of the cement with moisture. It is normal, it happens on perfectly good product, and it weathers off over the first season or two.

It is worth knowing this because it appears at exactly the moment a homeowner is most anxious about a new patio, and because there is a small industry selling cleaning services for it. Products exist to remove it, and they work, but doing nothing also works.

What it is not: a sign of a bad batch, a bad installation, or a leak.

Reading what moved over winter

Spring is when the property tells you what’s actually going on.

A crack in the same place as last year is frost heave, not a surface problem. Water is being held under the surface, freezing and lifting. Patching it again will produce the same crack next spring. This is the north-shore pattern, Huntington, Commack, Setauket, Miller Place, Port Jefferson, where moraine till holds water rather than draining it.

A dished area where cars park is settlement into an under-compacted base. That’s the south-shore pattern, on the free-draining outwash sand from Medford southward.

Spread at the edges of a paved area, with joints opening across the field, is edge restraint failure. It doesn’t self-correct and it doesn’t stop.

A retaining wall leaning forward is drainage. It cannot be pushed back. It comes down and goes back up with the drainage it should have had.

Stepped diagonal cracking through mortar joints in masonry is differential settlement. Repointing it hides it; it reopens in the same line.

Three of those five are worth acting on before the next winter rather than after it. Water already inside masonry in November does its damage by March.

What to leave alone

• Hairline cracks in mortar that follow the joint lines and haven’t changed. Age and weather. Repointing territory eventually, not urgently.
• Colour variation between pavers. Concrete pavers vary between production batches and are meant to be blended across the field. It settles visually as the surface weathers.
• A little loose chip on a new chip seal driveway. Some aggregate that didn’t embed will come free over the first few weeks. It sweeps up.
• Pressure washing everything annually. It removes joint sand and, on softer natural stone, erodes the surface. A hose and a stiff brush handles most of it.

Not sure what you’re looking at?

Send a photograph. We’ll tell you whether it’s cosmetic, whether it’s worth watching, or whether it needs doing before winter: including when the answer is that it’ll hold another five years.

Get in touch → · Call (631) 245-9273

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