German method of drawing out the claw for the jack rafter at the valley. Only works on equal pitched roofs.
French method of drawing out the purlin rafter claw. Works on unequal pitched roofs.
Another example of developing the claw angle on the purlin rafter.
The rafter claw is developed from the intersection of 3 planes.
- The plane on the bottom of the hip rafter.
- The plane on the bottom of the rafters.
- The Roof Surface Plane.
The intersection of the roof surface plane and the bottom of the hip rafter plane develop a line of intersection that is parallel to the hip rafter. The intersection of the plane on the bottom of the rafters and the plane on the bottom of the hip rafter develop a line of intersection that is parallel to the hip rafter.
The next 3 drawings are for the jack rafter claw on the Valley Rafter.
Two more methods of drawing out the jack rafter claw in profile.
Drawings showing the folding roof surface method for the rafter claw.
Draw down technique, flächenschiftung, for developing the claw angles on the roof surface.