Aluminum Windows vs. Galvanized Windows

Galvanization

• Galvanization entails coating a metal in zinc. This process improves the corrosion resistance of the base metal. When it appears on its own, the word “galvanized” most commonly refers to galvanized steel, though technically speaking you can galvanize any type of metal, including aluminum. Therefore, the possibility exists that a zinc coating represents the only difference between an aluminum window and a galvanized window. However, more likely than not, a galvanized window is one with a frame made of galvanized steel.

Strength

• Galvanized steel exhibits far greater tensile strength than aluminum, meaning it can bear significantly more weight without bending or breaking. The strength of galvanized steel as a material leads to its use in very large window frames or frames with particularly big panes of glass. Aluminum, on the other hand, most commonly appears in standard residential windows for homes and apartments. However, aluminum exhibits perfectly adequate strength for residential use and is cheaper than galvanized steel, making it ideal for home installation. Furthermore, the strength of stainless steel also causes the material to weigh significantly more than aluminum, which may make home installation difficult.

Maintenance

• Aluminum windows require very little maintenance -- they wipe clean with water and a sponge. Furthermore, they come in various colors, eliminating the need to paint and finish them. Galvanized, steel, however, requires a good deal of upkeep. For instance, you must paint steel windows to protect them from exposure to inclement weather and UV light. However, according to the authors of the book “Open/close: Windows, Doors, Gates, Loggias, Filters,” steel's thermal conductivity properties cause water to form on the surface of steel windows. This can damage and strip away paint, requiring regular repainting. Steel windows may also exhibit problems with moisture passing through the frame and into your home.

Additional Information

• Aluminum windows may contain galvanized parts, and vice versa. For instance, manufacturers sometimes make window screens from galvanized steel mesh -- an aluminum window frame may employ such mesh. Galvanized steel screws and bolts also appear commonly in aluminum window installation. Or, a galvanized steel framed window may contain aluminum fasteners or other small parts. Regarding availability, you can easily find aluminum and plastic windows at hardware stores. Steel windows, however, generally come from specialty manufacturers and often require customization or special ordering, which can drive up costs.