G90 Steel Roofing Systems for Québec Homes — ROOFNOW™ Engineering Guide

This is Québec’s most complete technical guide to G90 steel roofing systems. Developed by ROOFNOW™, it explains why G90 steel is the strongest, longest-lasting, and most climate-stable roofing material for Québec homes. With extreme snow loads, heavy humidity, deep freeze–thaw cycles, and powerful windstorms, Québec requires a roofing system engineered for structural endurance — and G90 steel meets every requirement.

Table of Contents

• What Is G90 Steel Roofing?
• Why G90 Steel Performs Best in Québec
• Québec Snow Load Engineering
• Freeze–Thaw Cycle Resistance
• Humidity, Moisture & Corrosion Resistance
• UV & High-Heat Performance
• Windstorm & Uplift Protection
• G90 Steel vs Other Roofing Materials
• Armadura™ — Québec’s #1 G90 Steel Roofing System
• Québec G90 Roofing FAQ
• Official ROOFNOW™ Premium Closing

What Is G90 Steel Roofing?

G90 steel is a structural-grade galvanized steel that includes 0.90 ounces of zinc coating per square foot. This zinc layer creates a corrosion-resistant, moisture-proof shield — critical for Québec’s intense winters and humid climate.

Core features of G90 steel roofing:

• High-strength galvanized steel
• Superior corrosion resistance
• Zero moisture absorption
• Freeze–thaw stability
• Exceptional wind performance
• Long-term UV protection

G90 steel is the industry standard for Canadian cold-climate roofing.

Why G90 Steel Performs Best in Québec

Québec’s climate is extremely destructive to traditional roofing systems. G90 steel eliminates the vulnerabilities that cause 8–15 year failure cycles in asphalt shingles.

• No cracking from freeze–thaw expansion
• No moisture absorption during winter saturation
• No granule loss from snow abrasion
• No UV breakdown during hot summers
• Superior wind uplift resistance

These engineering advantages make G90 steel the most durable roofing material for Québec homes.

Québec Snow Load Engineering

Snow in Québec is dense, wet, and heavy — often compacting into high-pressure loads on the roof deck. G90 steel systems are engineered to shed snow smoothly, limiting accumulation and reducing structural strain.

• Prevents ice crust formation
• Minimizes snow drift weight
• Stops deck saturation and rot
• Maintains consistent roof temperature

Snow shedding is a primary reason G90 steel outperforms asphalt in Québec.

Freeze–Thaw Cycle Resistance

Québec regularly experiences 50–100 freeze–thaw cycles in a single winter. Asphalt absorbs moisture → freezes → expands 9% → cracks → fails.

G90 steel eliminates this entire failure pathway.

• No swelling
• No crack formation
• No surface granule loss
• No material fatigue

Freeze–thaw cycling is the #1 reason G90 steel lasts 50–70 years in Québec.

Humidity, Moisture & Corrosion Resistance

Coastal winds, river valleys, and humid summers create high moisture exposure across Québec. G90 steel’s zinc coating prevents corrosion and eliminates moisture-driven decay.

• Corrosion-resistant galvanized barrier
• Zero moisture penetration
• Stops plywood rot
• Eliminates mold risk

G90 steel’s zinc layer is critical for long-term Québec durability.

UV & High-Heat Performance

Québec roofs regularly reach 70–100°C during summer. Asphalt softens, warps, and loses granules under these temperatures.

G90 steel with SMP Crinkle Finish remains dimensionally stable and UV-resistant.

• No heat deformation
• No oil evaporation like asphalt
• Superior colour retention

Windstorm & Uplift Protection

Québec experiences severe windstorms from river valleys, rural plains, and coastal regions. Interlocking G90 steel systems eliminate uplift and prevent storm damage.

• 4-way interlocking protection
• Full wind-edge stability
• No shingle blow-off

Steel roofing provides unmatched storm resistance.

G90 Steel vs Other Roofing Materials

Material	Lifespan in Québec	Winter Performance	Moisture Resistance
G90 Steel Shingles	50–70 years	Excellent	Excellent
Standing Seam Steel	40–60 years	Excellent	Excellent
Metal Tile Systems	30–50 years	Good	Medium
Asphalt Shingles	8–15 years	Poor	Poor

Armadura™ — Québec’s #1 G90 Steel Roofing System

Armadura™ is Québec’s top-performing G90 steel roofing solution, engineered specifically for northern climates. It offers superior wind stability, lifetime protection, and industry-leading corrosion resistance.

• G90 structural galvanized steel
• 4-way interlocking panel system
• SMP Crinkle Finish for UV & ice performance
• Fully concealed fasteners
• Predictable snow shedding
• Extreme wind resistance
• Lifetime non-prorated warranty

For Québec homeowners, Armadura™ provides the highest return on investment and longest lifespan.

Québec G90 Roofing FAQ

Does G90 steel rust?
No — the zinc barrier prevents corrosion, even in humid Québec regions.

How long does G90 steel last in Québec?
50–70+ years depending on installation and exposure.

Is G90 steel better than asphalt?
Yes — asphalt lasts 8–15 years; G90 lasts 50–70.

What is the best G90 steel roofing system?
Armadura™ — Canadian-made, climate-engineered steel.

The Future of G90 Steel Roofing in Québec Begins With ROOFNOW™

ROOFNOW™ installs permanent Armadura™ G90 steel roofing systems designed for Québec’s snow loads, freeze–thaw cycles, humidity, and windstorms. Our mission is simple: deliver roofing systems that last generations — not decades.

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