A plank is a piece of timber that is flat, elongated and rectangular, with parallel faces, higher or longer than wide, used in carpentry and the construction of ships, houses, bridges and other structures.
Planks are usually made from sawn timber, more than 38 mm thick, and are generally wider than 63 mm. If the width is less than 63 mm and the thickness less than 38 mm is called board. Common in the USA planks are usually a minimum of a 2x8, more commonly are 2x10 or 2x12 normally stocked in a lumber retailer. Planks are commonly used as a work surface on elevated scaffolding, therefore need to be wide enough to provide strength without breaking when walking on them.
Since ancient times planks sawn from logs were used to build bridges, walkways, ships or houses, including flooring (where they are known as floorboards), coverings and furniture. Planks also served as a support to form a shelf or table.
See also 
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