Texmateria
Galvanized Steel
Steel protected with a zinc coating. It often has a mottled spangle or dull gray surface, and scratches can reveal darker steel that later rusts.
Common names
- zinc-coated steel
- hot-dip galvanized steel
- GI sheet
Search phrases
- dull silver sheet metal
- industrial galvanized metal
- spangled metal
- tin roof metal
Common uses
- HVAC ducts
- Industrial stairs and grating
- Roofing and gutters
- Guardrails
- Outdoor brackets
Choosing points
- Best for roofs, gutters, fences, sheds, and service areas where a rough practical metal look is useful.
- Hot-dip galvanizing often has a cloudy spangle or uneven gray surface.
- Cut edges and drilled holes are weaker points because the zinc layer is interrupted.
- It feels utilitarian, so it works well in industrial, back-of-house, and outdoor contexts.
How it ages
- The zinc layer sacrifices itself before the steel rusts. In harsh coastal or acidic environments it wears down faster.
What to avoid
- Do not assume galvanized steel is protected after cutting, welding, or grinding; exposed edges need repair coating, especially outdoors.
