What is the cost to shot-blast a garage floor before epoxy coating in Ottawa

Shot Blasting Costs for Ottawa Garage Floors

Shot blasting a garage floor before epoxy coating in Ottawa typically costs $1.50 to $4.00 per square foot, which works out to roughly $600 to $2,400 for a standard two-car garage of 400 to 600 square feet. The exact price depends on floor condition, accessibility, existing coatings that need removal, and whether the shot blasting is quoted as a standalone service or bundled into a complete epoxy installation package.

Shot blasting is a mechanical surface preparation method where a self-contained machine propels small steel shot (similar to ball bearings) at high velocity against the concrete surface. The impact removes surface contaminants, laitance, thin coatings, and weak concrete while simultaneously creating a CSP 3 to CSP 5 profile — a rougher texture than diamond grinding produces. The steel shot is collected, recycled within the machine, and reused, while a built-in vacuum captures the concrete dust and debris. The process is fast, dustless when equipment is properly maintained, and requires no water or chemicals.

In Ottawa, shot blasting is the preferred preparation method in several specific situations. If your garage floor has a thick existing coating — such as a failed DIY epoxy kit, old paint, or industrial sealer — shot blasting removes it far more efficiently than diamond grinding. Floors with widespread surface contamination from years of road salt, oil drips, and de-icing chemicals also respond well to shot blasting, which strips away the entire contaminated surface layer rather than just profiling over it. Contractors also choose shot blasting when they need a deeper profile for high-build 100 percent solids epoxy systems or polyaspartic coatings.

The cost breakdown typically looks like this in the Ottawa market. Basic shot blasting on a clean, uncoated floor in good condition runs $1.50 to $2.50 per square foot — this is straightforward profiling work. Shot blasting with coating removal (stripping old paint, failed epoxy, or sealer) runs $2.50 to $4.00 per square foot because multiple passes are needed and the machine settings must be adjusted for the coating type. Some contractors charge a minimum mobilization fee of $400 to $600 regardless of floor size, since the equipment is expensive to transport and set up.

One important consideration for Ottawa garages is that shot blasting can be too aggressive for thin or deteriorated slabs. Many older Ottawa homes — particularly those in neighbourhoods built before the 1980s — have garage slabs as thin as 3 to 3.5 inches. Aggressive shot blasting on thin concrete can create divots and expose aggregate, requiring additional patching before the epoxy goes down. A skilled contractor will do a test area first and adjust the machine's blast rate and travel speed accordingly.

When comparing quotes, confirm whether the shot blasting price includes edge work (the machine cannot reach within 2 to 3 inches of walls, so hand grinding is needed at perimeters), crack repair, and final vacuuming. Some contractors bundle all preparation into one line item while others itemize each step. Getting at least three quotes lets you compare apples to apples — the Ottawa Construction Network directory at justynrookcontracting.com is a helpful resource for finding flooring contractors to get those quotes from.

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Looking for experienced contractors? The Ottawa Construction Network connects Ottawa homeowners with qualified professionals:

• Homeupgraders
• JC Carpentry
• MAK Construction and Development Inc
• Diamond renovations
• Atlantis Tiles and Flooring