How often should I seal a concrete driveway in New Brunswick to protect it from road salt and freeze-thaw damage?

Seal your concrete driveway every 2-3 years in New Brunswick — and if your driveway is exposed to road salt splash from a busy street or sits near the coast, lean toward every 2 years rather than 3.

New Brunswick's combination of 150+ freeze-thaw cycles per year and heavy road salting from November through April is genuinely one of the harshest environments for concrete in Canada. What happens without a sealer is predictable: salt-laden meltwater penetrates the surface pores, refreezes at a lower temperature than plain water, and creates additional freeze-thaw cycles within the concrete itself — right at the surface where you can see the damage. The result is spalling and scaling, where the top layer of concrete flakes away in chips and sheets. Once that process starts, it accelerates quickly and there is no reversing it short of full replacement.

The right sealer matters as much as the frequency. For NB driveways, a penetrating silane/siloxane sealer is the best choice — it soaks into the concrete matrix and repels water from within rather than forming a film on top. Penetrating sealers don't peel, don't change the look of your driveway, and hold up well through freeze-thaw cycles. Acrylic sealers are cheaper and add a slight sheen, but they sit on the surface and tend to peel and flake in NB conditions — you'll be reapplying annually and dealing with a patchy appearance. Spend the extra money on a quality silane/siloxane product. A gallon runs $40-$80 at NB building supply stores and covers 150-300 square feet depending on the porosity of your concrete.

One critical rule: never apply a chemical de-icer to unsealed concrete, and never apply it to concrete less than one year old. New concrete needs a full year to fully cure and reach its design strength before it can tolerate de-icing chemicals. If you've just had a new driveway poured this season, use sand for traction this winter and apply your first sealer in the spring. After that, sodium chloride (road salt) should never touch your driveway — use sand, or if you need a chemical de-icer, choose calcium magnesium acetate (CMA). It's gentler on concrete and available at most NB hardware stores.

Timing your sealer application correctly makes a big difference. The ideal window is late spring through early fall — May through September. The concrete surface needs to be clean, dry, and above 10°C for the sealer to penetrate and cure properly. A cool, overcast day with no rain in the forecast for 24-48 hours is ideal. Avoid applying in direct summer sun, which causes the sealer to dry too quickly before it can penetrate. Before each application, clean the surface thoroughly with a concrete cleaner or pressure washer and let it dry completely — at least 24-48 hours.

A simple way to check whether your driveway needs resealing is the water bead test: pour a small amount of water on the surface. If it beads up and rolls off, the sealer is still working. If it soaks in and darkens the concrete, it's time to reseal.

Sealing is not optional in NB — it's the single most cost-effective maintenance step you can take to extend the life of a concrete driveway. A $60-$100 sealer application every couple of years is the difference between a driveway that lasts 30-40 years and one that starts scaling and deteriorating within a decade.

If you're unsure about the condition of your existing driveway or want a professional opinion before sealing, New Brunswick Concrete can match you with a local concrete contractor for a free assessment.