Essays Issue 07 · Autumn 2026 1 min read
Concrete, weathered
Fifty years of rain on a public library, and why the stains are part of the design.
Concrete was sold as permanent. It is not; it weathers, stains and grows moss in the places where water lingers. The best concrete buildings were drawn knowing that.
Drawn for rain
Look at the fins on the library's facade. They are deep enough to shade the glass, and their lower edges are cut back so water drips clear instead of running down the face. Fifty years later the streaks run exactly where the drawing said they would.
A building that weathers as it was drawn to is ageing well. One that weathers by accident is just getting dirty.
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