What is the slip resistance rating I should request for outdoor concrete steps in a New Brunswick winter climate?

For outdoor concrete steps in New Brunswick, you want a minimum coefficient of friction (COF) of 0.60 for wet conditions — and for NB winters specifically, aim for 0.80 or higher to account for ice, slush, and snow-melt conditions.

The standard reference point is the Americans with Disabilities Act (ADA) guideline of 0.60 COF wet, which is widely adopted in Canadian construction as a baseline for accessible and safe pedestrian surfaces. But NB's winters — with freeze-thaw cycles, ice formation, and salt-laden slush from November through April — push the practical requirement well beyond that minimum. A broom-finished or exposed aggregate surface targeting 0.80+ COF gives you meaningful safety margin when a step is coated in a thin film of ice at 6 a.m. in February.

Finish Type Determines Your Real-World Slip Resistance

The finish your contractor applies matters far more than any number on a spec sheet. Heavy broom finish (dragging a stiff-bristle broom across the surface while the concrete is still workable) is the most practical and cost-effective choice for NB steps — it creates parallel grooves that channel water and provide grip even when wet. A light broom finish is not enough for steps; request a medium-to-heavy transverse broom finish applied perpendicular to the direction of travel. This is standard practice among experienced NB concrete finishers and adds no cost.

Exposed aggregate is another excellent option — the protruding stone particles create a naturally textured surface with very high slip resistance, typically achieving 0.80-0.90 COF wet. It holds up well through freeze-thaw cycles provided the mix is properly air-entrained (4-7% air content, which is non-negotiable for any exterior concrete in NB). The trade-off is slightly higher cost and the fact that the aggregate pockets can collect debris and ice in crevices, so periodic cleaning matters.

Avoid smooth trowel finishes entirely on exterior steps. A steel-trowelled surface looks beautiful in a showroom and becomes a skating rink the moment it gets wet. It is simply the wrong finish for any NB exterior application, full stop.

Sealing Without Sacrificing Grip

Here is where many NB homeowners unknowingly undo good work: applying the wrong sealer to well-textured steps. Acrylic sealers and film-forming coatings fill in the texture profile and dramatically reduce slip resistance — sometimes dropping a safe surface below 0.60 COF. For exterior steps, use a penetrating silane/siloxane sealer that soaks into the concrete matrix without forming a surface film. It repels water and resists salt penetration without changing the texture or grip of the surface. Reapply every two to three years, which is essential given NB's 150+ annual freeze-thaw cycles and heavy road salt exposure.

If you want a coloured or decorative sealer on steps, ask your contractor specifically about anti-slip additives — fine aluminium oxide or polymer grit can be broadcast into a wet sealer coat to restore texture. This is a reasonable compromise for decorative stamped steps where appearance matters.

Practical Tips

Request that your contractor specify the finish type in writing before the pour — "medium-to-heavy transverse broom finish" leaves no ambiguity. For steps with a landing, the landing should receive the same finish as the treads. Nosing edges (the front lip of each tread) are the highest-risk zone; some contractors tool a slightly rougher texture at the nosing or install a non-slip nosing strip, both of which are worth discussing.

When to hire a pro: Step forming, pouring, and finishing is not a beginner DIY project. The concrete sets quickly, the forms must be precise, and the finishing window is narrow. For anything more than a single small step, get a professional. New Brunswick Concrete can match you with a local contractor for a free estimate — find concrete professionals in your area through the New Brunswick Construction Network directory at newbrunswickconstructionnetwork.com/directory?trade=concrete.