What is the best concrete sealer to use on an exposed aggregate driveway in Atlantic Canada, and how much does professional sealing cost?

For exposed aggregate driveways in Atlantic Canada, a penetrating silane/siloxane sealer is your best choice, offering superior protection against our brutal freeze-thaw cycles while preserving the natural stone appearance. Professional sealing typically costs $2-4 per square foot, making it a smart investment that can double your driveway's lifespan.

Penetrating sealers are ideal for exposed aggregate because they soak deep into the concrete matrix without forming a surface film that could peel or flake off. Unlike acrylic sealers that sit on top and create a glossy appearance (which looks unnatural on exposed aggregate), silane/siloxane sealers are invisible once cured but create a powerful water-repelling barrier within the concrete itself.

New Brunswick's 150+ annual freeze-thaw cycles make sealing absolutely critical. When water penetrates unsealed concrete and freezes, it expands by 9%, creating microscopic fractures that grow larger each winter. Exposed aggregate is particularly vulnerable because the surface texture creates more entry points for water. A quality penetrating sealer reduces water absorption by 90-95%, dramatically reducing freeze-thaw damage, salt scaling, and surface deterioration.

For Atlantic Canada conditions, look for sealers containing both silane and siloxane compounds. Silane molecules are smaller and penetrate deeper, while siloxane molecules are larger and provide surface protection. Popular brands include Prosoco Consolideck LS, SureCrete X-S Plus, and Foundation Armor SX5000. These typically cost $40-80 per gallon and cover 150-300 square feet depending on the concrete's porosity.

Professional application costs $2-4 per square foot for most New Brunswick driveways. A typical 500-square-foot driveway runs $1,000-2,000 for professional sealing. This includes surface cleaning, crack repair if needed, and proper application with commercial-grade sprayers. Some contractors offer package deals combining cleaning and sealing for $3-5 per square foot total.

Timing matters significantly in our Maritime climate. The best sealing window is late spring through early fall when temperatures stay consistently above 10°C and rain isn't forecast for 24-48 hours. New concrete must cure for at least 30 days before sealing, and the surface must be completely clean and dry. Professional contractors typically pressure wash first, then apply sealer when conditions are optimal.

Reapplication frequency depends on exposure and traffic. Most penetrating sealers last 2-3 years on driveways, though high-traffic areas or surfaces exposed to heavy road salt may need annual touch-ups. You'll know it's time to reseal when water no longer beads on the surface during rain.

DIY sealing is possible but professional application ensures even coverage and proper penetration. Contractors have commercial sprayers that apply consistent, thin coats without puddling or streaking. They also know how to handle windy conditions and can spot areas that need extra attention.

Need help finding a professional concrete contractor for sealing? New Brunswick Concrete can match you with experienced contractors who understand Maritime conditions and use quality sealers designed for our challenging freeze-thaw environment.