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Trimming errors

From the wallpaper problem solver - quick reference guide

Sometimes patterns will not match up properly from roll to roll or the seams will not butt because the rolls were incorrectly trimmed either at the factory or on the job.

The most common causes associated with edge trimming are:

  • Overtrimming
  • Undertrimming
  • Scalloped edge

Wallpaper trimming errors - Under trim
Under trim

Wallpaper errors - over trim
Over trim


Overtrimming is a result of too much of the selvage being trimmed away. When an excess amount of material has been trimmed away, there is no way to compensate for the missing pattern. If it is noticeable at a glance or is unacceptable, the installer should stop and return the wallcovering to the supplier for replacement.

Wallpaper errors - over trim
Over trim


Undertrimming is the complete opposite to overtrimming. Not enough of the selvage has been trimmed away, which results in a slight double image forming at the seam. This excess may be trimmed on the work table using a straight edge and cutter.

Wallpaper trimming errors - Under trim
Under trim

Scolloped edge

Scalloped edge is the result of the trimmers in the factory moving back and forwards as the wallcovering is passing through. This results in the seams weaving in and out when they are supposed to be cut perfectly straight.


Note: The installer should identify this problem within the first roll hung; the remaining product should be returned for replacement.

Wallpaper problem solver


Thank you to Aspiring Walls for providing the information for this quick reference guide.

Wallpaper problem solver topics   Ask an Expert   How to wallpaper


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