4' x 8' Galvanized Steel Sheets (Zinc Coated)
The industry standard for HVAC ductwork, roofing, and fabrication. Stocks ready in G60 & G90 coatings from heavy 10 Gauge to light 30 Gauge.
Stock Specifications
We stock ASTM A653 galvanized sheets in standard 4' x 8' sizes. Other sizes (4' x 10', 5' x 10') available upon request.
| Gauge No. | Thickness (Inch / mm) | Lbs per Sheet (4'x8') | Typical Use |
|---|---|---|---|
| 10 Gauge | 0.1382" (3.51 mm) | 179.9 lbs | Heavy Structural |
| 12 Gauge | 0.1084" (2.75 mm) | 141.1 lbs | Brackets / Frames |
| 14 Gauge | 0.0785" (1.99 mm) | 102.2 lbs | Industrial Tanks |
| 16 Gauge Popular | 0.0635" (1.61 mm) | 82.6 lbs | General Fabrication |
| 18 Gauge | 0.0516" (1.31 mm) | 67.2 lbs | Cabinets / Panels |
| 20 Gauge | 0.0396" (1.00 mm) | 51.6 lbs | Light Enclosures |
| 22 Gauge | 0.0336" (0.85 mm) | 43.7 lbs | Signage / Flashings |
| 24 Gauge HVAC | 0.0276" (0.70 mm) | 35.9 lbs | Ductwork / Gutters |
| 26 Gauge | 0.0217" (0.55 mm) | 28.2 lbs | Roofing / Siding |
10 Ga is thick like a coin.
Heavy Duty
10 - 14 GaugeStructural components, mounting brackets, and heavy tanks.
Medium Duty
16 - 20 GaugeThe "All-Rounders". Used for cabinets, hoods, and general fabrication.
Light Duty
22 - 30 GaugeHVAC ductwork, roofing, siding, and non-load bearing trims.
Choose Your Protection
The "G" number represents the weight of zinc coating on the steel. More Zinc = Longer Life.
G60
- HVAC Ductwork (Interior)
- Appliances & Cabinetry
- Painted Applications
- Lower Cost Option
G90
- Outdoor Roofing & Siding
- Gutters & Flashings
- Coastal Environments
- 50% More Zinc Life
Technical Insight: What does "G90" actually mean?
Per ASTM A653, "G90" means a total of 0.90 ounces of zinc per square foot of sheet (measured on both sides combined). This thicker layer acts as a sacrificial anode—if the steel gets scratched, the surrounding zinc will corrode first to protect the steel core.
Surface Finish Options
The appearance of the zinc crystal ("Spangle") affects both aesthetics and paint adhesion.
Regular Spangle
StandardThe classic industrial look with visible "snowflake" zinc crystals. The surface is naturally textured.
Zero Spangle
Best for PaintA matte, uniform finish with no visible crystals. Provides a flat surface for high-quality painting.
Chem-Treat
ProtectiveChemical passivation applied at the mill. Invisible to the eye, but critical for preventing "White Rust" during storage.
Versatile Protection
From hidden ductwork to exposed roofing, galvanized steel provides the most cost-effective corrosion defense.
HVAC Ductwork
The standard material for air ducts. Our LFQ (Lock Forming Quality) sheets ensure seams won't crack during fabrication.
Roofing & Siding
Corrugated panels for barns and warehouses. Requires the heavy G90 coating to withstand rain, snow, and humidity.
Electrical Enclosures
Used for breaker boxes and cabinets. Offers electromagnetic interference (EMI) shielding and indoor rust protection.
Stamped Parts
Ideal for brackets, reinforcements, and body panels. The zinc coating acts as a lubricant during the stamping process.
Custom Processing Services
Don't pay for scrap. We cut, slit, and protect your steel to exact specifications.
Shearing & Blanking
Precision guillotine shearing to cut standard 4x8 sheets down to your required component size. Square and burr-free.
- Tolerance +/- 1/32"
- Max Width 144"
- Diagonals Verified
Slitting & Recoiling
Convert wide master coils into narrow strips for roll forming lines, gutter machines, or tubing production.
- Min Width 1.00"
- Coil ID 20" / 24"
- Edge Condition Deburred
Surface Protection
Critical for "Zero Spangle" or "Paint Grip" finishes. We apply PVC film or paper interleaving to prevent scratches during transit.
- PVC Types Clear / White / Laser
- Paper Interleaving
- Removal Easy-Peel
Fabricator FAQ
Answers to common questions regarding forming, painting, and welding galvanized steel.
Will the zinc coating flake off when I bend it?
No. Our stock is produced to ASTM A653 "Lock Forming Quality" (LFQ) standards. The steel is specifically annealed to ensure the zinc coating adheres tightly even during severe forming operations like 180-degree bends or Pittsburgh locks, without cracking or peeling.
Can I paint directly onto standard galvanized sheets?
Not recommended without proper preparation. The zinc surface is smooth and chemically reactive, which often causes paint to peel over time. For successful painting, you should:
- Use a specialized metal etching primer (wash primer).
- Alternatively, order "Phosphatized" (paint-grip) or "Galvannealed" sheets from us, which are specifically designed for immediate painting.
What precautions are needed when welding galvanized steel?
Welding zinc-coated steel generates zinc oxide fumes, which can cause "Metal Fume Fever" if inhaled. Always work in a well-ventilated area and wear appropriate respiratory protection. For the best weld quality and safety, it is recommended to grind off the zinc coating in the immediate weld area prior to welding.
How much does a standard skid of 4x8 sheets weigh?
Skid weights vary significantly by gauge and sheet count. A typical full skid generally ranges between 2,000 lbs and 4,500 lbs. For example, a standard skid of 50 sheets of 16 Gauge 4'x8' weighs approximately 4,130 lbs. Please ensure your unloading equipment has sufficient capacity.