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Materials5 min read

Limestone: A Slow Material

Notes from the laboratory on how pale stone ages, stains and — eventually — heals.

By Mateo Ruiz

We keep forty limestone samples on weathering racks on the studio roof. Some are three years old. None of them looks the same as the day it was cut.

Stains are a language

Rain-run, lichen, a darker belt at the splash line: these are not failures of detailing but the stone's own handwriting. The task is to design so the marks fall where we want them.

Honed limestone beside unfilled travertine after two winters.

Limestone also heals. Surface calcite redissolves and redeposits, closing hairline cracks. A material that repairs itself is a good partner for a building meant to last a century.