Narrow side bonding

Narrow-side bonding is a joining method for wooden boards in which the narrow sides of the boards are glued together. In contrast to flat crosswise gluing, where the board layers are joined, narrow side gluing joins the boards together within one layer. The advantage of not having narrow side gluing is the planned cracking pattern within the top layer as a result of swelling and shrinkage processes.

Narrow side bonding vs.
 flat crosswise bonding

By gluing the individual layers crosswise, the shrinkage and swelling of the entire panel is significantly reduced and the component is more dimensionally stable, but each individual lamella in the cover layer can still shrink slightly, hindered by the layer below. This may result in a small joint of < 1 mm in the cover lamellae.
However, if narrow side bonding is present, this process can lead to unplanned cracks within the individual boards.

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