Shiplap is a type of wooden board used commonly as exterior siding in the construction of residences, barns, sheds, and outbuildings. It is either rough-sawn 25 millimetres (1 inch) or milled 19 mm (3/4 in) pine or similarly inexpensive wood between 76 and 254 mm (3 and 10 in) wide with a 9.5-12.7 mm (3/8-1/2 in) rabbet on opposite sides of each edge. The rabbet allows the boards to overlap in this area. The profile of each board partially overlaps that of the board next to it creating a channel that gives shadow line effects, provides excellent weather protection and allows for dimensional movement.
Useful for its strength as a supporting member, and its ability to form a relatively tight seal when lapped, shiplap is usually used as a type of siding for buildings that do not require extensive maintenance and must withstand cold and aggressive climates. Rough-sawn shiplap is attached vertically in post and beam construction, usually with 6d-8d common nails, while milled versions, providing a tighter seal, are more commonly placed horizontally, more suited to two-by-four frame construction.
Small doors and shutters such as those found in barns and sheds are often constructed of shiplap cut directly from the walls, with only thin members framing or crossing the back for support. Shiplap is also used indoors for the rough or rustic look that it creates when used as paneling or a covering for a wall or ceiling. Shiplap is often used to describe any rabbeted siding material that overlaps in a similar fashion.
Video Shiplap
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Source of article : Wikipedia
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