Pave, seal, repeat — how often a Maryland driveway really needs it.

“How often do I have to seal my driveway?” is the question we get more than any other — and the honest answer is it depends what your driveway is made of. Asphalt wants a sealcoat every 2–3 years. Concrete wants a penetrating sealer every 3–5. Pavers land in that same 3–5 window. In Maryland, all three sit at the fast end of the range, because our winters are engineered to punish a driveway.

We pour concrete driveways and lay paver driveways across Potomac, Bethesda and Rockville, and the maintenance conversation is one we’d rather have before the surface fails than after. Below is the schedule we give our own customers — by material — plus the two things most homeowners get wrong: sealing too often, and waiting until it’s past sealing entirely.

01 / Why Maryland is hard on drivewaysTwo enemies: the freeze-thaw cycle and the salt.

Maryland sits in a nasty climate band for pavement. We don’t stay frozen all winter the way northern New England does; instead we swing back and forth across 32°F over and over, sometimes several times in a single week. Every one of those swings is a freeze-thaw cycle: water works into a hairline crack or an open pore, freezes, expands about 9%, and pries the opening a little wider. Thaw, repeat, and the crack you couldn’t see in November is a real one by March.

Then there’s the salt. Road crews and homeowners dump chloride de-icers on everything that freezes, and it comes home on your tires and boots. The Montgomery County Department of Environmental Protection now runs a whole Winter Salt Management program precisely because chloride is so corrosive to concrete, masonry and local streams — and the U.S. EPA documents the same attack on hard surfaces. Salt also drives extra freeze-thaw cycling by melting snow that then refreezes in your cracks. It’s the same combination we blame in our piece on why 30-year-old concrete is failing across Montgomery County.

Sealer — whatever the surface — is the barrier that keeps water and salt out of the material. That’s the whole game. Which is why the schedule matters.

02 / The scheduleReseal intervals by driveway type.

Here’s the quick-reference version. The ranges are the general national guidance; the “Maryland reality” column is where our climate actually lands you.

Asphalt: sealcoat every 2–3 years.

Asphalt is held together by a petroleum binder, and that binder dries out. Sun, water and oxygen attack it — the Asphalt Institute notes that a seal coat exists to retard that oxidation and protect the binder from fluids and UV. When the binder oxidizes, asphalt goes from black and flexible to gray and brittle, and brittle asphalt cracks. A sealcoat every 2 to 3 years renews that surface film. Brand-new asphalt is the exception: let it cure and off-gas for 6 to 12 months before the first coat, or you’ll trap it.

Concrete: a penetrating sealer every 3–5 years.

A properly poured, air-entrained concrete driveway doesn’t need a film on top the way asphalt does — but in a salt-and-freeze climate it badly wants a penetrating silane/siloxane sealer that soaks in and makes the surface hydrophobic without changing its look. That’s the barrier that stops brine from soaking in and spalling the surface. Reapply every 3 to 5 years — sooner on a sun-baked, heavily salted apron. Keeping water out is, per the Portland Cement Association, the single biggest lever on concrete’s freeze-thaw durability. (Decorative or stamped concrete is a different animal with a topical sealer on a tighter clock — see how often to reseal stamped concrete.)

Pavers: reseal every 3–5 years, and mind the joints.

An interlocking paver driveway flexes with the freeze-thaw instead of cracking, which is a big part of why we like it here. Its maintenance is less about the pavers and more about the joint sand between them: polymeric sand locks the pavers together and blocks weeds and ants. Reseal every 3 to 5 years to lock the sand, deepen the color and shed spills — and top up any joints the pressure washer or plow has stripped.

The calendar is a starting point. The surface is the real appointment book — when water stops beading, it’s time, whatever the date says. — Foreman’s note, Kempf crew

03 / How to know it’s actually dueLet the driveway tell you.

You don’t need to track dates. Every one of these surfaces gives you the same tell — the ten-second water-bead test — plus a couple of visual cues:

• Splash some water on the surface. If it beads and sits, the sealer is still working. If it soaks straight in and darkens the surface, the sealer is gone — reseal.
• Asphalt gone gray: fresh sealcoat is near-black. When it fades to a chalky gray and you can see individual stones (raveling), the binder is oxidizing. Time to coat.
• Concrete darkening & dusting: if the slab drinks up water, shows white salt crusting (efflorescence), or leaves powder on your hand, the sealer has worn through.
• Pavers fading & loose joints: washed-out color and sand you can flick out of the joints with a screwdriver both say it’s time.

04 / When it’s past sealingThe point where you’re repaving, not resealing.

This is the other half of the question, and the one people avoid asking. Sealer is a surface treatment, not a structural fix. It renews the top layer; it cannot rebuild a failed base or a slab that’s coming apart. Once a driveway has crossed into structural failure, another coat is money thrown at a problem it can’t touch. The signs you’re there:

• Alligator cracking — interconnected cracks in a scaly, reptile-skin pattern on asphalt. That’s the base failing under the surface, not a surface problem.
• Potholes and large sunken areas — the sub-base has washed out or given way.
• Widespread concrete spalling — the top peeling and flaking off to expose the stone aggregate across large areas, usually from years of salt on unsealed concrete.
• Cracks wider than ¼ inch, everywhere — a few isolated cracks you can fill; a field of them means the slab or base is done.

Caught early, resealing is what prevents ever reaching this point — that’s the whole return on doing it on schedule. Caught late, you’re choosing between resurfacing and full replacement, which is many times the cost of the sealing cycles that would have avoided it. We walk through those replacement numbers in our honest cost of a concrete driveway in Maryland, and if you’re weighing that decision, an honest site visit will tell you which side of the line your driveway is on.

05 / Doing it rightFour rules that make a reseal last.

Whether you DIY it or hire it out, the same fundamentals decide whether the coat lasts two years or peels by fall:

1. Clean first, always — oil spots, dirt, mildew and loose sand all keep sealer from bonding. A sealer laid over grime is a sealer that peels.
2. Fill cracks before you coat — sealcoat and sealer bridge hairlines, not real cracks. Rout and fill the open ones first.
3. Pick the weather — dry surface, mild day, no rain for 24–48 hours, out of blazing midday sun. The same seasonal logic in our best time to pour concrete in the DMV guide applies to sealing.
4. Thin, even coats — two thin passes beat one heavy one every time, on all three surfaces. Heavy coats trap solvent, haze, and stay tacky.

06 / The bottom lineThree numbers, one habit.

Asphalt every 2–3, concrete every 3–5, pavers every 3–5 — and let the water-bead test make the final call each time. Keep that habit and a Maryland driveway shrugs off the freeze-thaw and the salt for decades. Skip it, and you trade a modest maintenance coat for a five-figure repave. If you’d like us to look at where your driveway stands — reseal it, or tell you honestly that it’s time to rebuild — we cover Potomac, Bethesda, Rockville, Chevy Chase, Silver Spring and all of Montgomery County.