corner block

1. Scenery. Finishing out the flat terminology, a corner block is the method of reinforcing the joint between the rails and stiles in the corners on the back side of the flat. These are a 45 degree isosceles triangle with sides 6"-12" of some thin material like 1/4" plywood (preferred) or Luan or Masonite (occasionally acceptable). For strength,when using plywood, which always has an odd number of layers, the grain should run perpendicular to the joint.

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Above with keystone, showing preferred fastener placement.

2. Entertainment trussing. A cube that allows box truss sections to be connected at right angles to each other. The most versatile is the Six-way Corner Block which allows sections to be joined in any dimension.

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