How long does exterior paint last in New Brunswick compared to drier Canadian provinces?

Exterior paint in New Brunswick typically lasts 5 to 8 years on most surfaces with quality products and good preparation, compared to 8 to 12 years or more in drier provinces like Alberta and Saskatchewan. The difference comes down almost entirely to NB's Maritime climate — high humidity, frequent rain, heavy freeze-thaw cycling, and coastal salt exposure all accelerate paint breakdown.

To understand why NB is hard on exterior paint, consider what happens through a typical year. Spring brings heavy rain, snowmelt, and wood that has absorbed winter moisture — paint applied the previous fall may already be dealing with trapped moisture trying to escape outward through the coating. Summer brings humidity that regularly hits 75-85% in coastal communities and river valleys, giving mildew and algae a foothold on north and east-facing walls. Then fall delivers early frosts and freeze-thaw cycling that can begin in October in places like Edmundston and Bathurst. That freeze-thaw action is paint's most relentless enemy: water seeps into microscopic cracks, freezes and expands, then thaws and contracts — over 100 or more cycles per year in many NB locations — slowly prying the coating away from the substrate beneath it.

Alberta, by comparison, is cold but dry. Interior provinces like Saskatchewan experience cold winters but very low annual precipitation and far fewer freeze-thaw cycles because temperatures stay consistently cold rather than fluctuating back and forth across the freezing point. Less moisture means less paint stress and much longer service life.

What this means for your NB home: The 5-to-8-year range is achievable with quality 100% acrylic latex paint (Benjamin Moore Aura Exterior, Sherwin-Williams Duration, Dulux WeatherShield), proper surface prep, and application within the May-to-October window. Expect the lower end — or shorter — if you use mid-grade or economy paint, paint over damp wood, skip primer on bare spots, or live in a coastal area around Saint John, Shediac, or the Bay of Fundy shore where salt spray is a factor. Exposed south and west-facing walls can fade and break down a couple of years earlier than protected north and east-facing walls due to direct UV exposure, even though it's the north-facing walls that grow mildew fastest.

Practical tips to maximize longevity in NB: Start with premium 100% acrylic — the flexibility to handle freeze-thaw is built into the resin chemistry of high-quality acrylic latex and simply is not there in cheaper formulations or oil-based paints. Prime every bare spot, knothole, and caulk joint. Caulk and seal every gap at trim, window frames, and corner boards before painting. Touch up any chips or cracked areas as soon as you notice them — NB winters will convert a small chip into a major peeling problem within one or two seasons. A small investment in annual maintenance keeps the full repaint 8 years out rather than 5.

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