Fabric on most products runs north to south (top to bottom).  Railroaded fabric runs east to west (left to right).  On specific products  like this railroaded fabric cornice and fabrics such as solids, the workroom will railroad the fabric to eliminate seams. On flat valances and window treatments if you can have the fabric railroaded it is the way to go.  Remember that this only applies for valances that over 45″ wide.  If you are under 45″ you will not have to worry about vertical seams since fabric is generally 54″ wide off the bolt.

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