Irregular Hip Roof Framing Geometry

Mark 3 perpendicular lines on the top edge of the hip rafter using these dimensions.

Irregular hip roof framing geometry.

Rafter tools for android with quad tetrahedra analytic algorithm technology. It s easy to get the valley rafter angles but applying the roof framing angles to the actual valley rafter material is tricky. Most roof eave angle corners are at 90. They are off center to illustrate this using sketchup and your models dimensions draw a right triangle with one leg at 25 9 3 8 and the other leg length at 17 2 5 8 now scale the triangle down so the hypotenuse is reduced to 1 1.

For irregular or bastard hip roofs the roof eave angle can be between 35 and 150 you ll get an unconstructable error message if the roof is unconstructable with the current input parameters. Helping apprentice carpenters on their journey to becoming master carpenters. Enjoy the videos and music you love upload original content and share it all with friends family and the world on youtube. Hip roof framing hip to common to ridge join diagram ply sheathing angle and cut set back both sheet orientations sheathing hip cut calculator hip roof ply cut angle diagram 1138 93 ft 35 6 sheets 5 10 15 waste 40 sheets.

Holy grail of roof framing geometry trigonometry book i book ii. When framing irregular hip valley roofs the h v rafter members are not equally split by the sheathing lines. You ll need the valley rafter plan angles the valley rafter offset for the two roof planes the valley rafter backing bevel cut depth dimension the peak and foot valley rafter side cut angles the hip valley rafter side cut mark for. It will display the framing square usage for the slope angle of the hip rafter 27 50055 6 12.

These roof framing books were written to make complex roof framing simple. Download irregular hip rafter geometry dxf. If the hip is not backed this is the amount to lower the seatcut of the hip to have the corner edge of the hip plane in with the sheathing common rafter ll major side majll majspan majllratio. Irregular hip roof valley rafter framing with a plan angle greater than 90 is probably as tough as it gets for stick framed roofs.

Holy grail of roof framing geometry trigonometry book i book ii.