A batten is a thin strip of solid material (usually
wood). Battens are used for various purposes in building construction, as well as other various fields.
Battens are used to provide the fixing point for roofing sheet or roof tiles. The orientation and spacing of the battens depends on the type of roof. Battens may be oriented at right angles to the
trusses or rafters of a roof, like purlins. They may be parallel to the slope of the roof, as on a batten seam roof, where the battens cover seams in the roofing material and are themselves covered by metal caps. Some roofs may use a grid of battens in both directions, known as a counter-batten system.
Batten trim, or batten molding, is a thin strip of trim, typically with a rectangular cross-section, used to cover seams between panels of exterior siding or interior paneling. Board-and-batten
sidingis an exterior treatment of vertical boards with battens covering the seams.
cabinetry, battens may be used to strengthen panels made up of multiple boards, as in a batten door, or to cover joins.
sailing, battens are long, thin strips (usually fiberglass, or some similar material, nowadays, but historically wooden) used to support the roach of a sail.
In the steel industry, battens may also be referred to as "Top hats", in reference to the profile of the metal.
An example of a barn that was built using board & batten siding [http://www.maplegroveconstruction.com/horse-barn-6b.jpg]
Wikimedia Foundation. 2010.