Tréteaux Angles for RafterTools for iPhone

Tréteaux Angles for RafterTools+ app for iPhone Help file.

RafterTools+ app for iPhone Tréteaux Angles Usage.

The Tréteaux Angles can be used for Tréteaux , that translates to trestle sawhorse, but can be used for hip rafters rotated into the roof surface plane. Layover Valley Sleepers or California Valley Sleepers.
Gratsparren bei unterschiedlicher, verschiedener Dachneigung.







Keywords -- Definitions

  1. Devers De Pas -- DP Line... A line following the footprint of the tilted hip rafter or sawhorse leg in plan view.
  2. Trait carré -- TC Line... A perpendicular line. The TC line from the rotated hip rafter block in the hip rafter backing triangle locates the intersection of the DP line with the base leg of the hip rafter backing triangle.
  3. tréteau à devers... Trestles with tilt.
  4. Layover Valley Sleepers
  5. California Valley Sleepers
  6. Layover Boards
  7. Rotated Hip Rafters
  8. Footprint.. The bottom surface of the hip rafter traced in plan view.
  9. Folding Roof Surface.. Roof surface plane folded out and down.
  10. Draw Down Roof Surface... Roof surface plane folded down over the plan view plane, ground level plane.
  11. Jack Rafters
  12. Purlin Rafters
  13. Miter Lines... Lines on the sides of jack rafters or purlin rafters that develop the cut angle to fit against the sides of hip rafters.
  14. Back Bevel Lines... Lines on the top and bottom edges of  jack rafters or purlin rafters that are set in the roof surface plane and follow the hip rafter on the roof surface.
  15. Claw Lines.. Lines on the fold down or draw down roof surface that develop the miter lines and claw lines on the side of the jack rafters or purlin rafters. The claw lines are parallel to the hip rafter line on the roof surface. These lines can be used in the folding roof surface or the draw down roof surface method. These claw lines can also be used for herse.  Where the roof surface is not connected to the plan view plane.
  16. Skewed Purlin Rafters... Purlin rafters that are rotated into the roof surface plane, but skewed from the eave line at a specific rotation angle in plan view.
  17. La Herse is the term used to describe when you lay a plane or surface down on the ground level to work on. Typically these involve roof planes, but can also be employed when projecting a face/side of a piece of wood in space.  Once 'en herse' you can work on the piece and solve the angles. It's one of many ways of solving a drawing.(Patrick Moore)









  1. R8-DP...Tilted Hip Rafter Slope Angle on DP Side of Hip Rafter.
  2. R9-DP...Horizontal Plane Rotation Angle for Tilted Hip Rafter on DP Line from Footprint to Hip Rafter Run Line. 
  3. D-DP...Horizontal Plane Rotation Angle for Tilted Hip Rafter on DP Line from Eave Line to Hip Rafter Footprint.
  4. R10-DP...Vertical Plane Rotation Angle from Plumb for Tilted Hip Rafter on DP Line .
  5. PSBm-DP...Prism Footprint Saw Blade Bevel Angle Along side of Hip Rafter Rotated into the Roof Surface Plane at Foot Of Hip Rafter .
  6. PSBa-DP...Prism Footprint Saw Blade Bevel Angle Along side of Hip Rafter on DP Side at Foot of Hip Rafter.
  7. SR4Bm-DP...Prism Footprint Angle in Plan View at Eave Line Intersection.
  8. SR4Ba-DP...Prism Footprint Angle in Plan View at Intersection of DP Line and Profile Rafter Footprint Line in Plan View.
  9. R11m-DP...Hip Rafter Miter Angle on Side Face Of Rotated Hip Rafter at Peak.
  10. P7m-DP...Main Side Purlin Rafter Bevel Angle on Side Face Parallel To Roof Surface.
  11. P8m-DP...Main Side Purlin Rafter Miter Angle On Top Edge Face Perpendicular to Roof Surface.
  12. P9m-DP...Main Side Purlin Rafter Saw Blade Bevel Angle Along Miter Angle on Side Face.
  13. P10m-DP...Main Side Jack Rafter Miter Angle on Side Face Perpendicular to Roof Surface at Hip Rafter Rotated Into Roof Surface.
  14. P11m-DP...Main Side Jack Rafter Bevel Angle On Top Edge Face Set in Roof Surface.
  15. P12m-DP...Main Side Jack Rafter Saw Blade Bevel Angle Along Miter Angle on Side Face.
  16. P13a-DP...Adjacent Side Purlin Rafter Miter Angle on DP Side Of Hip Rafter on Face Perpendicular To Roof Surface, Lower Claw Angle.
  17. P14a-DP...Adjacent Side Purlin Rafter Miter Angle on DP Side Of Hip Rafter on Face Perpendicular To Roof Surface, Upper Claw Angle.
  18. P15a-DP...Adjacent Side Purlin Rafter Bevel Angle on DP Side Of Hip Rafter on Face Set in Roof Surface.
  19. P16a-DP...Adjacent Side Jack Rafter Miter Angle on DP Side Of Hip Rafter on Face Perpendicular To Roof Surface, Lower Claw Angle.
  20. P17a-DP...Adjacent Side Jack Rafter Miter Angle on DP Side Of Hip Rafter on Face Perpendicular To Roof Surface, Upper Claw Angle.
  21. P18a-DP...Adjacent Side Jack Rafter Bevel Angle on DP Side Of Hip Rafter on Face Set in Roof Surface.
  22. Skewed Purlin Rafter Rotation Angle...Enter the Skewed Purlin Rafter Rotation Angle in Plan View.
  23. Purlin Rafter Depth...Enter the Purlin Rafter Depth.
  24. Hip Rafter Depth...Enter the Hip Rafter Depth.
  25. Hip Rafter Width...Enter the Hip Rafter Width.
  26. P19a-DP...Adjacent Side (Head Cut) for Rotated Purlin Rafter Bevel Angle on DP Side Of Hip Rafter on Face Set in Roof Surface.
  27. P20a-DP...Adjacent Side (Head Cut) for Rotated Purlin Rafter Miter Angle on DP Side Of Hip Rafter on Face Perpendicular To Roof Surface, Lower Claw Angle.
  28. P21a-DP...Adjacent Side (Head Cut) for Rotated Purlin Rafter Miter Angle on DP Side Of Hip Rafter on Face Perpendicular To Roof Surface, Upper Claw Angle.
  29. P22a-DP...Adjacent Side (Foot Cut) for Rotated Purlin Rafter Bevel Angle on DP Side Of Hip Rafter on Face Set in Roof Surface.
  30. P23a-DP...Adjacent Side (Foot Cut) for Rotated Purlin Rafter Miter Angle on DP Side Of Hip Rafter on Face Perpendicular To Roof Surface, Lower Claw Angle.
  31. P24a-DP...Adjacent Side (Foot Cut) for Rotated Purlin Rafter Miter Angle on DP Side Of Hip Rafter on Face Perpendicular To Roof Surface, Upper Claw Angle.
  32. Seat Line Purlin Rafter Plan...Purlin Rafter Seat Line Dimension for Plan View.
  33. Seat Line Purlin Rafter Roof...Purlin Rafter Seat Line Dimension for Roof Surface.
  34. Seat Line Hip Rafter...Hip Rafter Footprint Seat Line Dimension for Plan View.
  35. Roof Sheathing Angle...Roof Surface Roof Sheathing Angle for Claw Lines.
  36. Claw Line 1...Hip Rafter Dimension Line on the Roof Surface for Claw Line #1.
  37. Claw Line 2...Hip Rafter Dimension Line on the Roof Surface for Claw Line #2. Claw lines 1 & 3 develop the miter line on the rafter perpendicular to the roof surface.
  38. Claw Line 3...Hip Rafter Dimension Line on the Roof Surface for Claw Line #3.
  39. Claw Line 4...Hip Rafter Dimension Line on the Roof Surface for Claw Line #4. Claw lines 2 & 4 develop the claw line on the rafter perpendicular to the roof surface.

Treteaux Angles help file links.






Claw Lines for Trèteaux Hip Rafters 
The claw lines are laid out on the roof surface using the fold down or draw down layout technique. The claw lines are always parallel.
    Seat Lines that develop the claw lines
  • Purlin Rafter Seat Line Dimension for Plan View
  • Purlin Rafter Seat Line Dimension for Roof Surface
  • Hip Rafter Footprint Seat Line Dimension
    Claw Lines
  • Hip Rafter Dimension for Claw Line #1 is always = 0
  • Hip Rafter Dimension for Upper Claw Lines are from #1 to #3
  • Hip Rafter Dimension for Lower Claw Lines from #4 to #2

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