GI vs MS Wire Mesh: Differences and When to Use Each

MS (Mild Steel) wire mesh is plain steel with no coating - it rusts within weeks of exposure to moisture. It is the cheapest option and used only for temporary applications or where the mesh will be embedded in concrete (where rust is less critical). GI (Galvanized Iron) wire mesh is steel wire with a zinc coating applied either by hot-dip galvanizing or electro-galvanizing. Hot-dip GI mesh has a thicker zinc coating (85 grams per square metre or more) and lasts 8-15 years outdoors. Electro-galvanized mesh has a thinner coating and lasts 3-5 years. Always ask for hot-dip galvanized for any outdoor or exposed application. For construction reinforcement that will be embedded in concrete, MS mesh is acceptable and more economical. For all other applications, pay the small premium for GI.