What is shiplap?
Shiplap is wood board paneling with rabbeted edges that overlap horizontally to create a flush, linear finish, commonly used for interior accent walls and exterior weatherproofing.
Shiplap consists of individual wooden boards cut with a rabbet (stepped notch) on each edge, allowing each board to overlap the one below it. The overlapping creates a horizontal shadow line and a flush surface that appears seamless when installed properly. This construction method provides both a finished look and functional water-shedding in exterior applications.
The key distinction between shiplap and tongue-and-groove paneling lies in how the boards interlock. Tongue-and-groove boards have a projecting tongue on one edge that fits into a groove on the adjacent board, creating a tighter, interlocking joint. Shiplap boards, by contrast, simply overlap in one direction, making them faster to install but slightly less weather-resistant without proper caulking or sealing.
Shiplap works as an interior accent wall finish, a fireplace surround, or exterior siding. Its linear pattern adds visual interest and texture. Common wood choices include pine, spruce, and engineered wood products. Contractors often finish shiplap with paint or stain, and the overlapping edges can be left raw or sanded smooth depending on the desired aesthetic.
For homeowners seeking shiplap installation or custom wall finishes, custom carpentry finishing specialists in the Greater Toronto Area can assess site conditions, material options, and installation methods for your project.