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Steel Material Thickness Material thickness of steel is referred to as Gauge (GA). Gauge is the two digit number that relates to the thickness of the steel sheet in decimal inches. The larger the Gauge number, the thinner the sheet. Example Tolerances: 26 Gauge = .016” to .020” 24 Gauge = .021” to .027” 22 Gauge = .027” to .033”
Steel Material Thickness Material thickness of steel is referred to as Gauge (GA). Gauge is the two digit number that relates to the thickness of the steel sheet in decimal inches. The larger the Gauge number, the thinner the sheet. Purchased Thickness: 26 Gauge = .018” 24 Gauge = .023” 22 Gauge = .0296”
Hot Dipped Galvanized Defined: Galvanized is 100% melted Zinc applied to steel coil. “G” stands for Galvanized and last digits stand for the amount of Zinc that is applied to both sides of the steel coil. Example: G-90 is 0.90 ounces of Zinc per square foot, total both sides.
Meets ASTM A653-96.
Great Sacrificial Advantages
Hot Dipped Galvanized offers a desirable characteristic with respect to corrosion by sacrificing itself to protect slit edges and scratches.
No applicable corrosion warranty
Generally has a smoother surface for paint application purposes.
Galvalume Defined: Galvalume is a combination of 20% melted Zinc and 80% Aluminum that is applied to the steel coil. “AZ” stands for Aluminum and Zinc. The last two digits stand for the coating weight of both sides in ounces per square foot. Examples: AZ55 is 0.55 oz./sq.ft. (Bare ACG) AZ50 is 0.50 oz./sq.ft. (To Be Painted)
Aluminum/Zinc Coated Carbon steel sheet that meets ASTM A792-96.
By volume consists of a minimum thickness of .50 oz per Sq Ft of AL/Zn for both sides of the steel sheet.
20 year 6 month warranty against substrate corrosion
25 year warranty for AZ55 ACG
Great Corrosion Properties
Good Sacrificial Advantages
Galvalume vs. Galvanized Acrylic Coated Galvalume Galvanized
Galvalume vs. Galvanized Moderate Marine / Rural Hot Dipped Galvanized After 18 years, G-90 Galvanized exhibits red rust Galvalume Galvalume after 23 years – No major sign of red rust.
Galvalume vs. Galvanized Salt Spray Corrosion Resistance With cut edges protected, the coating on Galvalume AZ50 lasts 5 to 10 times longer than the coating on G90 Hot Dipped Galvanized. Salt spray tests conducted with bare cut edges exposed, the corrosion resistance of Galvalume AZ50 is typically three to four times that of G90 HD Galvanized.
Galvalume vs. Galvanized Salt Spray test concerning the amount of hours to first significant rust Total # of Hours
Galvalume vs. Galvanized Corrosion Losses of Substrates H. D. Galvanized Galvanized 0.8 0 0.2 0.4 0.6 1 Corrosion Loss (Mils)
Dissimilar Metals Direct contact of steel to these metals will cause corrosion damage and deterioration of the steel. Even water run off from these metal will cause corrosion of the steel. Copper Iron Graphite Lead
Conforms to ASTM B209-96.
From recycled scrap content.
Light in weight.
Highly resistant to corrosion.
Excellent reflector of light and heat.
Highly workable and easy to form.
Two Types of Alloys: Cast and Wrought
Cast have low melting points and tensile strength. Wrought have high tensile strengths and are 85% of aluminum usage.
Standard Alloys for Roofing and Cladding;
3003,3004 alloy corrosion resistance and formability are excellent.
3105 alloy is an essentially 98% pure aluminum
5052 alloy is excellent and in the annealed condition it offers higher strengths than 3003/3004/3105 alloys.
Aluminum The International Alloy Designation System is the most widely accepted naming scheme for wrought alloys. Each alloy is given a four-digit number, where the first digit indicates the major alloying elements.
1000 series are essentially pure aluminum.
2000 series are alloyed with copper.
3000 series are alloyed with manganese, and can be work-hardened.
4000 series are alloyed with silicon.
5000 series are alloyed with magnesium.
6000 series are alloyed with magnesium and silicon.
7000 series are alloyed with zinc, and can be precipitation hardened to the highest strengths of any aluminum alloy.
8000 series is a category used for lithium alloys.
.032” , .040” , or .050”
H 14, H 24, or H 34 for roofing product.
H1 Strain hardened without thermal treatment.
H2 Strain hardened and partially annealed.
H3 Strain hardened by low temperature heating.
A second digit denotes the degree of hardness.