How often should I reseal my garage floor in the New Brunswick freeze-thaw climate?

In New Brunswick's aggressive freeze-thaw climate, a garage floor sealer should be reapplied every 2 to 3 years for penetrating sealers and every 3 to 5 years for film-forming coatings like epoxy or polyaspartic, though actual timing depends on traffic volume, salt exposure, and whether the garage is heated or unheated. Regular resealing is one of the most cost-effective maintenance tasks you can perform to protect your garage floor from NB's punishing winter conditions.

The reason NB garage floors need more frequent sealing than those in milder climates comes down to the freeze-thaw cycle and road salt. When your vehicle enters the garage covered in snow, slush, and road salt — which happens daily for roughly five to six months of the year — that salty water pools on the concrete surface and is absorbed into the pore structure. When temperatures drop, the water freezes and expands inside the concrete, creating micro-fractures. Road salt compounds this damage because it lowers the freezing point unevenly, creating more freeze-thaw cycles within the concrete itself. Over just a few winters, an unsealed or poorly sealed garage floor in NB will develop surface scaling, pitting, and spalling — the top layer literally flakes off in sheets and chunks.

Penetrating sealers (silane, siloxane, or silicate-based products) soak into the concrete and chemically react to reduce water absorption without forming a surface film. They are the most practical choice for NB garage floors because they do not peel, flake, or become slippery when wet. Products like Siloxa-Tek 8500 or Ghostshield Lithi-Tek 4500 are well-regarded options available through NB building supply stores or online. These sealers typically last 2 to 3 years in a garage that sees daily winter vehicle traffic. The cost for a DIY application is $50-$150 in materials for a two-car garage, and the application takes about an hour — you simply clean the floor, apply the sealer with a pump sprayer or roller, and allow it to dry.

The way to tell when a penetrating sealer needs reapplication is the water bead test. Sprinkle a few drops of water on the concrete surface in several locations. If the water beads up and sits on the surface, the sealer is still working. If the water absorbs into the concrete within 30 seconds, the sealer has worn through and it is time to reapply. Perform this test every spring after the salt season ends — it takes 30 seconds and tells you exactly where you stand.

Film-forming coatings — epoxy and polyaspartic systems — create a visible, often coloured or flaked surface layer over the concrete. These provide superior protection against salt, chemicals, and staining, and they make the floor much easier to clean. A professionally applied polyaspartic coating on a two-car garage in NB costs $2,000-$5,000 and typically lasts 5 to 7 years before needing a maintenance recoat. DIY epoxy kits are available for $200-$500 but generally last only 2 to 4 years, partly because DIY surface preparation is rarely as thorough as professional diamond grinding. When a film-forming coating starts to show wear — thin spots, peeling at the edges near the garage door where salt exposure is highest, or dull patches in the tire traffic lanes — it is time for a recoat rather than a complete strip-and-redo.

Timing your resealing is important in NB. Apply sealers in late spring or early fall when the concrete surface is dry and temperatures are between 10 and 30 degrees Celsius. Never apply sealer to damp concrete or when rain is expected within 24 hours. For the best adhesion, wash the floor thoroughly with a concrete degreaser and allow it to dry completely — at least 24 to 48 hours — before applying any sealer or coating.

For penetrating sealers, this is a straightforward DIY maintenance task that any homeowner can handle with a pump sprayer, a broom, and an afternoon. For epoxy or polyaspartic recoats, professional application is recommended to ensure proper adhesion to the existing coating. Need help finding a professional for your garage floor? Get matched with a contractor through New Brunswick Garages for free.