Shiplap

Shiplap has a rabbet cut on each long edge, creating an overlapping joint between boards that leaves a small, consistent reveal gap. Tongue-and-groove joins boards with a tight interlocking profile that eliminates the gap. Shiplap's reveal gap creates shadow lines that add texture and visual depth, the defining aesthetic of the shiplap look.

Yes. Shiplap is one of the traditional exterior siding profiles and performs well when installed in the correct orientation with proper drainage. Exterior shiplap should be in a species with natural decay resistance or be treated, and must be primed and painted on all faces and edges before installation. Interior shiplap products are not rated for exterior exposure.

The shadow gap on typical residential shiplap is between 1/8 inch and 1/4 inch. Wider reveals create a more pronounced texture; narrower reveals read as a subtler surface. The reveal size is built into the board profile, so you do not adjust it during installation. Choose a profile with the reveal size that matches the look you want.

Yes, and ceiling shiplap installations are increasingly popular in both rustic and contemporary interiors. The installation process is the same as wall shiplap, using finish nails into ceiling joists. Lighter-weight MDF shiplap is easier to handle overhead than solid wood. Confirm that the ceiling framing spacing aligns with the board width for full support.

Real wood shiplap can be left natural with a clear sealer, stained, whitewashed, or painted. MDF shiplap is designed for paint and should always be primed and painted, as raw MDF will absorb moisture and degrade if left unsealed. The most popular current finish in contemporary interiors is white paint, which maximizes the visual contrast of the shadow gap.