We design and install large scale tree sculptures for public spaces. The question that always comes up from municipal planners and landscape architects is a practical one: what does maintenance look like once it's installed? The answer is purely dependent on the material.
Corten Steel: Not as Much Work as You Think
Corten develops a protective oxide when exposed to weather. That patina prevents further corrosion of the steel. The trick is letting it weather naturally-the first 6 to 9 months will produce the most runoff, which can stain pavers. We recommend that the piece be allowed to cure on gravel or soil before final placement or install a drip tray underneath. Once the patina is stabilized maintenance is reduced to 2 times per year. Wash with mild soap and warm water. Rinse well. After cleaning, apply two coats of non-silicone paste wax. In 2012, a client in Arlington installed a multi-piece sculpture in Penrose Square. That piece remains in place and simply needs yearly cleaning.
Stainless Steel: More Regular Attention
Stainless is a mirror or brushed finish and that finish dulls with dust and pollutants. Trees of stainless steel require cleaning every three months with filtered water and a detergent of conservation quality. Rinse with distilled water to avoid mineral build-up. Wax it once a year. Check for corrosion regularly especially in coastal areas or extreme temperature areas.
