How long does stamped concrete last in New Brunswick's freeze-thaw climate compared to exposed aggregate?

Both stamped concrete and exposed aggregate can last 25-40 years in New Brunswick when properly installed with air-entrained concrete, but exposed aggregate typically outperforms stamped concrete in our harsh Maritime freeze-thaw conditions.

The key difference lies in surface texture and maintenance requirements. Exposed aggregate creates a naturally textured surface where the top layer of concrete paste is removed to reveal decorative stone aggregate underneath. This textured surface provides excellent traction and naturally sheds water and ice. Stamped concrete, while beautiful, creates a textured pattern pressed into the surface that can collect water, salt, and debris in the recessed areas — exactly where freeze-thaw damage begins in New Brunswick's 150+ annual freeze-thaw cycles.

Exposed aggregate advantages in NB climate: The rough, pebbled surface allows water to drain quickly rather than pooling in depressions. Salt and sand used for winter traction don't accumulate in low spots. The aggregate stones themselves are extremely durable — often harder than the concrete matrix around them. When properly sealed every 2-3 years, exposed aggregate develops an attractive patina as it ages and can look better at 15-20 years than when first installed.

Stamped concrete challenges in NB: The decorative patterns create countless small pockets where water can collect and freeze. Salt-laden slush from NB roads settles into these depressions, creating concentrated freeze-thaw cycles. The stamped surface is more difficult to clean thoroughly, and accumulated debris holds moisture against the concrete. Most importantly, stamped concrete requires more frequent sealing — annually rather than every 2-3 years — to prevent water infiltration into the pattern lines.

Critical success factors for both: Air-entrained concrete (4-7% air content) is absolutely mandatory for either finish in New Brunswick. The concrete mix should be 32 MPa minimum for durability. Proper slope for drainage (minimum 1/4 inch per foot away from structures) prevents water pooling. A quality penetrating sealer must be applied before the first winter and maintained religiously.

Cost considerations: Exposed aggregate typically costs $10-16 per square foot installed, while stamped concrete runs $12-20 per square foot. However, stamped concrete's higher maintenance requirements (annual sealing, more frequent repairs) can make it more expensive over its lifetime.

When to hire a professional: Both finishes require expert timing and technique. Exposed aggregate involves precise timing for washing the surface cream to reveal stones without over-exposing them. Stamped concrete has an extremely narrow window between when the concrete is ready to stamp and when it becomes too hard — measured in minutes, not hours. The specialized tools, release agents, and color hardeners require professional experience to achieve consistent results.

For New Brunswick's challenging climate, exposed aggregate generally provides better long-term value through lower maintenance and superior freeze-thaw resistance, though both can be excellent choices when properly executed and maintained.