Clapboard

Oak clapboards lean-to attic Ephraim Hawley House, United States
Clapboard siding stained dark brown
Captain William Smith House at Minute Man National Historical Park, United States, a restored saltbox house with unpainted clapboard siding

Clapboard (/ˈklæpˌbɔːrd/ or /ˈklæbərd/), also called clabbard, bevel siding, lap siding, and weatherboard, with regional variation in the definition of those terms, is wooden siding of a building in the form of horizontal boards, often overlapping.

Contemporary use of clapboard/weatherboard
Contemporary use of clapboard/weatherboard and corrugated galvanised iron in Australia

Clapboard, in modern American usage, is a word for long, thin boards used to cover outer walls and (formerly) roofs of buildings. Historically, it has also been spelled clawboard and cloboard. In the United Kingdom, Australia and New Zealand, the term weatherboard is used. Australians also use the term chamferboard for the tongue-and-groove variant.

An older meaning of clapboard is small split pieces of oak imported from Germany for use as barrel staves, and the name is a partial translation (from klappen, "to fit") of Middle Dutch klapholt and related to German Klappholz.

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