Understanding Shiplap
True shiplap boards have an "L"-shaped notch cut into the top and bottom edges, allowing them to interlock when stacked horizontally. This overlapping joint (called a rabbet joint) creates a self-aligning, weather-resistant connection — which is why it was originally used on ships and barn exteriors. The interior design trend was popularized by Chip and Joanna Gaines on HGTV's Fixer Upper, transforming shiplap from a utilitarian building material into a coveted design element. Today, "shiplap" is often used loosely to describe any horizontal plank wall treatment, including nickel-gap boards and V-groove panels that are not technically shiplap but achieve a similar look. The characteristic narrow shadow gap between boards creates subtle horizontal lines that add texture and visual interest.
Shiplap in Interior Design
Shiplap adds texture, depth, and character to walls. It is most commonly used as an accent wall behind beds, fireplaces, or in bathrooms. Painted white, it creates the classic farmhouse look. Painted in darker colors (navy, forest green, charcoal), it becomes a moody modern statement. Left as natural wood, it brings rustic warmth. Shiplap works beautifully in farmhouse, coastal, Scandinavian, and cottage styles. The horizontal lines make ceilings appear wider, and the texture prevents white walls from feeling flat or sterile. Shiplap can also be installed vertically or on ceilings for a different visual effect.