How do I protect my new concrete patio through its first NB winter?

The first winter is the most critical for new concrete in New Brunswick — fresh concrete is more porous than cured concrete and far more vulnerable to the salt, freeze-thaw cycles, and moisture that define a Maritime winter. Getting through that first season without damage sets the foundation for decades of performance.

Wait the full curing period before winter arrives. Concrete reaches roughly 70% of its design strength in the first 7 days and about 90% in 28 days. If your patio was poured in late September or October, give it the full 28-day cure before any freezing temperatures arrive. Do not load it with heavy furniture or planters while it is still curing, and keep foot traffic minimal for the first week.

Apply a penetrating sealer before freeze-up. This is the single most important thing you can do for a new NB patio. A silane/siloxane penetrating sealer soaks into the concrete's pore structure and repels water from within, rather than forming a film on top. Apply it when temperatures are consistently above 5°C and rain is not expected for 24-48 hours — typically late September to mid-October in southern NB (Moncton, Fredericton, Saint John areas). Cost is roughly $40-$80 per gallon, covering 150-300 square feet per gallon depending on the concrete's porosity. For new concrete, wait at least 28 days after the pour before sealing.

Never use road salt or rock salt on new concrete. This cannot be overstated. Sodium chloride is devastating to concrete in its first year, when the surface is most porous. The salt solution penetrates the surface, lowers the freezing point of trapped water, and creates intense freeze-thaw cycling within the concrete matrix itself — dramatically accelerating spalling and surface scaling. Use sand for traction all winter. If you need a chemical de-icer in an emergency, calcium magnesium acetate (CMA) is the least damaging option, but even this should be avoided on concrete less than one year old.

Clear snow promptly to reduce the time melt water sits on the surface. Avoid metal shovels that can chip or scratch the surface — use a plastic shovel or snow blower.

Plan for spring inspection. After your first thaw in March or April, inspect the surface for scaling (thin layers flaking off), spalling (deeper pitting), or cracking. Minor surface issues discovered early can often be addressed with a concrete resurfacer. Cracks wider than 1/4 inch or any sign of structural movement should be assessed by a professional. New Brunswick Concrete can connect you with a local contractor for a post-winter inspection if you're concerned.