How often should a commercial building exterior be repainted in New Brunswick?

Most commercial building exteriors in New Brunswick need repainting every 5 to 10 years, depending on the siding material, paint quality, building exposure, and the severity of the Maritime climate at that location. A well-prepared, professionally painted wood or fibre cement exterior using a premium 100% acrylic latex can realistically last 7 to 10 years. Poorly prepped surfaces or mid-range paint on a coastal or exposed location may start showing failure in 4 to 5 years.

New Brunswick's climate is one of the harshest in Canada for exterior paint. The combination of 100-plus freeze-thaw cycles per year, high Maritime humidity (especially in Saint John, Shediac, and coastal communities), salt air from the Bay of Fundy, and intense UV radiation on south- and west-facing walls all work together to degrade exterior paint films faster than in most other provinces. A building that would last 10 years between repaints in southern Ontario might need attention at the 6 or 7-year mark in New Brunswick.

Material matters enormously. Wood clapboard and cedar shingle siding — common in older NB commercial buildings in Fredericton's downtown and Saint John's historic district — absorbs and releases moisture seasonally, which causes paint to flex and eventually crack. These surfaces need repainting more frequently than fibre cement or aluminum. Metal surfaces like steel doors, flashings, and railings can rust through degraded paint quickly in NB's salt-humid climate and should be inspected annually. Brick and masonry exteriors are typically painted less frequently (every 10-15 years) but need careful moisture assessment before each repaint, as moisture trapped under masonry paint causes spalling.

Watch for these early warning signs rather than waiting for a fixed interval: chalking (a white powdery residue when you rub the wall), fading beyond what you'd accept visually, cracking or alligatoring of the paint film, peeling or bubbling near joints and trim, or visible mildew/algae growth on north-facing walls. Any of these signs mean it's time to repaint — waiting longer allows moisture into the substrate and turns a paint job into a repair-and-paint job, which costs significantly more.

Practical tips: The best time to schedule a commercial repaint in NB is spring (May to June) or early fall (August to September). Avoid July and August if your building is south-facing and sun-exposed — application in direct hot sun causes flash-drying that reduces paint adhesion and durability. Always get a professional assessment before scheduling the work, as the painter needs to evaluate whether the existing paint film is in good enough condition to accept a new topcoat, or whether surface prep and priming will add significantly to the project scope and cost.

For a commercial building repaint in NB, hiring a licensed and WorkSafeNB-covered commercial painting contractor is essential — not just for quality but for liability and insurance purposes. Browse commercial painters through the New Brunswick Construction Network directory at newbrunswickconstructionnetwork.com/directory?trade=painting.

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