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Montreal winters are among the harshest in North America for exterior paint. Freeze-thaw cycles, ice, heavy snow loads, and UV-intense summers all combine to degrade even quality paint far faster than in milder climates. Here's what we do — and what you should look for — to make exterior paint last.
Why Montreal Winters Destroy Exterior Paint
The main culprit is the freeze-thaw cycle. Water gets behind paint through micro-cracks, freezes and expands, then thaws — causing peeling, bubbling, and cracking. On south-facing walls, UV exposure in summer further degrades paint binders. Poorly prepped surfaces are especially vulnerable.
- Freeze-thaw cycles cause paint to expand and contract
- Ice dams force water behind siding and paint
- UV degradation weakens paint binders over summer
The Right Timing: When to Paint Exterior in Montreal
The ideal painting window in Montreal is late May through September. Temperature must be above 10°C for at least 24 hours after application, and rain must be avoided for 48 hours. Never paint in direct hot sunlight — it causes flash-drying and poor adhesion.
Surface Preparation: The Most Important Step
No amount of premium paint will compensate for poor surface prep. Our process always includes: pressure washing to remove all dirt, mold, and loose paint; scraping and sanding to smooth edges; caulking all gaps around windows, doors, and trim; and priming with a high-quality exterior primer.
- Pressure washing at 2,500–3,000 PSI
- Scraping and sanding all loose paint
- Caulking every gap with elastomeric caulk
- Priming with oil-based or high-build primer
Choosing the Right Paint for Quebec Climate
For Montreal exteriors, we recommend elastomeric acrylic coatings — they flex with temperature changes instead of cracking. Benjamin Moore Aura Exterior and Sherwin-Williams Emerald Exterior are our top picks. For masonry and brick, breathable masonry paints are essential to allow moisture to escape.
Signs Your Exterior Paint Needs Attention
You don't need to wait for full peeling to act. Early warning signs include: chalking (white powder on the surface), micro-cracking, fading or colour shift, bubbling around window frames, and mold or mildew growth. Addressing these early saves significant money compared to full re-painting.
- Chalking or white powder on surface
- Micro-cracking or crazing
- Bubbling around windows or trim
- Visible mold or mildew growth
Frequently Asked Questions
Spring (May–June) and early fall (September–October) are both good windows, as long as temperatures stay above 10°C. We avoid late fall because cold nights can affect curing even if daytime temps are acceptable.
With proper prep and premium elastomeric coatings, 8–12 years is realistic. North-facing, heavily shaded walls may need attention sooner. Annual visual inspections are a good habit.
We prefer oil-based primers for bare wood and problem surfaces, and high-quality acrylic primers for previously painted surfaces in good condition. Primer choice depends significantly on the substrate.
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