Can Ottawa contractors resurface a badly pitted garage floor before epoxy application?

Absolutely — resurfacing a badly pitted garage floor before epoxy application is not only possible, it is often essential for a successful, long-lasting coating in Ottawa's demanding climate. Skipping this step is one of the most common reasons epoxy jobs fail prematurely, and in a city where road salt, freeze-thaw cycles, and snowmelt constantly attack concrete, getting the substrate right before any coating goes down is non-negotiable.

What Resurfacing a Pitted Garage Floor Actually Involves

The degree of pitting determines the repair approach. Shallow surface pitting — the kind caused by years of road salt exposure and minor freeze-thaw spalling — is typically addressed with a polymer-modified cementitious overlay or an epoxy mortar fill. These products bond directly to the concrete substrate and can fill pits, divots, and surface voids to create a flat, sound surface ready for coating. For deeper or more widespread damage, contractors may apply a skim coat or self-levelling underlayment across the entire floor, essentially giving the slab a fresh surface layer 3 to 6 millimetres thick. In severe cases where the concrete has deteriorated structurally — crumbling aggregate, deep spalling, or widespread delamination — partial or full slab replacement may be the only sound option, though this is less common in residential garages.

Before any resurfacing product goes down, mechanical surface preparation is mandatory. A professional contractor will use diamond grinding or shot blasting equipment to open the concrete profile, remove any existing sealers or contaminants, and give the repair material a proper surface to bond to. This step cannot be skipped or substituted with acid etching alone when significant pitting is present. The concrete surface profile (CSP) needs to reach a CSP 3 to 5 for most epoxy systems — roughly the texture of medium-grit sandpaper.

Moisture testing is critical at this stage, particularly in Ottawa. Spring snowmelt and the city's relatively high water table push moisture vapour through concrete slabs at rates that can cause both repair materials and epoxy coatings to fail. A calcium chloride test or in-situ relative humidity probe test should confirm that moisture vapour emission is below 3 pounds per 1,000 square feet per 24 hours before any resurfacing or coating proceeds. Many Ottawa homeowners discover moisture problems for the first time during this testing phase.

What This Work Costs in Ottawa

Concrete repair and surface preparation before coating typically adds $2 to $5 per square foot to your project cost. For a standard two-car garage of 400 to 600 square feet, that translates to $800 to $3,000 in preparation work alone, depending on the severity of the pitting and the repair method required. Once the floor is properly resurfaced and prepared, the epoxy or polyaspartic coating system goes on top — a 100 percent solids epoxy with a flake broadcast system runs $6 to $12 per square foot installed, while a polyaspartic system runs $8 to $15 per square foot. Your all-in cost for a badly pitted two-car garage, including resurfacing and a quality coating, could reasonably land between $3,500 and $9,000 depending on damage extent and system choice.

Timing and Seasonal Considerations

Ottawa's climate creates a firm application window. Resurfacing and epoxy work in unheated garages should happen between April and November, with substrate temperatures confirmed above 10 degrees Celsius — ideally between 15 and 25 degrees. Most repair mortars and overlays share this temperature sensitivity. Fall applications before first frost are excellent because concrete is dry after summer, humidity is manageable, and contractors are often more available than in the spring rush. If your garage has heating, work can proceed year-round with proper temperature management.

This is definitely a job for an experienced professional given the surface preparation equipment required and the multiple-product system involved. You can browse flooring and concrete contractors serving Ottawa through the Ottawa Construction Network directory at justynrookcontracting.com — it's a free resource to help you find and contact contractors directly, and getting three written quotes is always the right move before committing to a project of this scope.