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Narrow board tapered toward one edge, used as siding to cover the exterior of a framed building. Clapboards are attached horizontally, each overlapping the next one down. Cleft oak clapboard was introduced to New England in the 17th century; later materials included pine, cypress, and cedar.
This entry comes from Encyclopædia Britannica Concise. For the full entry on clapboard, visit Britannica.com.