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The Most Frequently Asked Maintenance Question:

How do I clean my metal roof?

In most cases, washing the painted surface with a water hose will remove most dirt and accumulated deposits. For stubborn dirt you can typically use a mild detergent or a house hold ammonia product. In all cases, test a small unobtrusive area for color-fastness before cleaning large areas.

Steel Panels & Roofing: Galvalume® Maintenance

With a little care and attention during service, prepainted Galvalume sheet will provide an extended service life. While durable, factory-applied finishes for metal building panels will last many years longer than ordinary paints, they should be cleaned thoroughly on a routine basis whenever the finish is not washed by rain. Applications where the paint finish is automatically washed by rain, such as roofing, do not require this maintenance.

Cleaning restores the appearance of the building, making repainting unnecessary, and maintains a pleasing appearance, as well as removing the buildup of corrosive materials. Applications requiring maintenance cleaning include soffits, siding under eaves, garage doors and the undersides of eave gutters.

In many cases, washing the painted surface with clean water from a garden hose will remove most of the dirt and accumulated deposits. Ideally, washing should be done at least every six months and more frequently in coastal areas where marine salt spray is prevalent or where high levels of industrial fallout occur. In cases where spray washing is ineffective in cleaning stubborn dirt, mild detergents or household ammonia solutions can be used as described below. In all cases, test a small unobtrusive area for colorfastness before cleaning large areas,

Using either solution, work from the top to the bottom of panels with a well-soaked soft cloth, sponge, brush with very soft bristles, or low-pressure spray washer to clean the surface. Washing from the top down avoids streaking. Application should be gentle to prevent shiny spots. Scouring powders or industrial solvents are not recommended, since they may damage the paint film. Solvent-containing cleaners such as Fantastic are very effective and can be used.

If mildew or other fungal growth is a problem and cannot be removed as described above, detergent containing bleach, such as Tide with Bleach, is recommended. The surface should be thoroughly rinsed with water after cleaning to remove traces of detergent.