How much does an exposed aggregate concrete driveway cost compared to plain concrete in Ottawa?

Exposed aggregate concrete driveways in Ottawa typically cost $14 to $24 per square foot installed, compared to $10 to $16 per square foot for standard plain concrete — representing a premium of roughly $4 to $8 per square foot for the decorative finish.

For an average Ottawa driveway of 50 square metres (540 square feet), you're looking at $7,500 to $13,000 for exposed aggregate versus $5,400 to $8,600 for plain concrete. The price difference reflects the additional labour involved in the exposed aggregate process — after the concrete is poured and levelled, contractors must carefully wash and brush away the surface paste to reveal the decorative stone aggregate beneath, then apply a surface retarder to control the exposure depth.

The exposed aggregate process adds complexity but delivers significant benefits for Ottawa driveways. The exposed stone surface provides excellent traction in winter conditions — far superior to smooth concrete that becomes dangerously slippery when wet or icy. This textured surface also hides minor surface imperfections, salt staining, and normal wear better than plain concrete. In Ottawa's harsh climate with heavy salt use, exposed aggregate maintains its appearance longer because the natural stone aggregate is more resistant to salt damage than the cement paste surface of plain concrete.

Ottawa's freeze-thaw cycles and clay soils affect both concrete types equally — the structural requirements remain identical. Both need minimum 30 MPa concrete with air entrainment for freeze-thaw resistance, proper base preparation with 300mm of compacted granular material below frost depth, and control joints every 3 metres to manage cracking. The exposed aggregate finish doesn't change these fundamental requirements, but it does require more precise timing during placement and finishing.

Maintenance costs favour exposed aggregate over the long term. Plain concrete in Ottawa often develops surface scaling (spalling) from salt exposure and freeze-thaw action, requiring costly resurfacing or replacement of the top layer. Exposed aggregate surfaces resist this scaling because the exposed stone aggregate is harder and more chemically resistant than cement paste. Both surfaces benefit from sealing every 3 to 4 years, but exposed aggregate typically maintains its appearance and structural integrity longer.

Consider your specific site conditions when budgeting. Driveways on Ottawa's prevalent clay soils may require additional base depth and geotextile fabric, adding $1 to $3 per square foot regardless of surface finish. Slopes steeper than 8 percent make the exposed aggregate washing process more challenging and may increase labour costs. Complex shapes, curves, or integration with existing hardscaping also add to both material types but affect exposed aggregate more due to the finishing complexity.

The ideal timing for concrete work in Ottawa is May through October when temperatures consistently stay above 10 degrees Celsius during curing. Exposed aggregate requires even more careful weather timing because the washing process must occur within a specific window after placement — typically 2 to 6 hours depending on temperature and concrete mix.

Need help finding a concrete contractor experienced with exposed aggregate? Ottawa Driveways can match you with local professionals who understand Ottawa's climate requirements and can provide detailed quotes comparing both options for your specific project.

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

• Luxe Painting and Renovations
• RenoMotion Inc.
• Black Tar Construction
• Home Front Services
• Valcor Construction