Which metal is gauged by ounces per square foot?

• A. Aluminum
• B. Copper
• C. Stainless steel
• D. Mild steel

Answer: (B)

Copper is gauged by ounces per square foot because, in copper sheet manufacturing and roofing, thickness is traditionally expressed as how much copper weighs over a square foot. This weight-based gauge reflects the fixed density of copper and provides a simple way to specify sheet thickness. Other metals, like aluminum, stainless steel, and mild steel, are typically specified by thickness in inches (or mils) or by gauge numbers rather than by weight per area, so they aren’t described using ounces per square foot.