Ordering Specifications for Rails

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Rail and lineal balustrade components, like other lineal products, are offered in even lengths from 4' to 16'. For rake portions of the stair, measure along the slope of the stair or use the lineal formula: Number of Treads x 13" (rounded up to the nearest even length).  
The minimum radius achievable with each rail profile will depend on several factors. These factors include such variables as the thickness of each ply, the overall thickness of the handrail, the height of the handrail, the angle of the stair, and whether the rail is bent on the rake or on the level portion of the stair. The minimum recommended radius for use on both rake and level applications are listed in the chart for each bending rail profile.
  The key components of curved rail construction are bending rails and bending moulds. Bending rail is most easily understood when imagining a standard rail profile cut into thin, vertical strips. Bending mould is a form, moulded to the outside profile of the handrail, that is used to cradle the bending rail as it is being shaped to the stair. Bending mould is included with bending rail.
Each ply comprising the bending rail is designed and manufactured with a tongue and groove bead to create an alignment of the plys. When assembled, bending rail results in a match of the standard rail profile.