Yes. Weathering Steel releases dissolved iron when water washes over the surface, particularly when the surface is subject to frequent rain during the early months of exposure. Porous materials such as stucco, wood, and concrete sidewalks will experience rust staining if exposed to runoff during the patinazation process.
Therefore, to prevent staining, incorporate permanent design details that divert roof runoff water away from porous surfaces. The use of gutters, extended overhangs, natural landscaping, and some strategic architectural planning can minimize the staining effect.
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