A layer of mortar, plaster, or similar material used as a base or flooring in medieval buildings.
From Old French 'estrice', possibly related to 'straw' or 'litter'. Used in medieval construction to describe a rough base layer of material laid before finishing floors.
Medieval builders used estrich—basically crushed tile, brick, and mortar—as an early form of concrete, and some estrich floors from 800 years ago are still standing in castles today.
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