double cut seam

Type of seam used in situations where it is necessary to overlap two strips of wallcovering and yet avoid a raised ridge. One example would be when a border is being used as a chairrail with coordinated wallcoverings above and below the border/wallcovering. A straightedge is placed at the center of the overlap and, with a razor knife or blade, a cut is made through both layers. The top cutoff section is removed and then the bottom cutoff portion is removed leaving a tightly butted seam.