Study of Shelf Cut following the line parallel to the long axis of the Hip or Valley Rafter
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P2
... Side Cut Angle on the shoulder of the jack rafter set in the surface of the roof,
at the intersection of the jack rafter and the Valley rafter.
C5 ... Backing Angle. Saw Blade Bevel Angle to make the cut along the miter line created by angle P2. P6 ... Angle produced by plane of the shelf cut intersecting the plumb face of the jack rafter, or Backing Angle C5 as viewed when projected to the plumb face of the jack rafter through angle 90° – P2. R4P ... Valley Rafter Side Cut Angle, traced on the unbacked shoulder of a Valley rafter, where the Valley intersects the plumb plane of a wall perpendicular to the roof ridge line (or, a plane parallel to the plumb face of a jack rafter). A5P ... 90° ± A5P is the dihedral angle measured between the lower (unbacked) shoulder of a Valley rafter and the plumb plane of a wall (a plane parallel to the plumb face of a jack rafter) perpendicular to the roof ridge line. |
Development of General Tetrahedron composed of Right Triangles
Overview of Tetrahedra and Triangles defining a Hip or Valley Roof
