Proportional Triangles Hip bevel development

On a sheet of paper or plywood, draw a horizontal line 250 mm long Draw a perpendicular line 100mm from the right hand side 100mm141.4mm Mark a point on the horizontal line mm from the perpendicular line This distance is the √2 or the relationship of half span to plan length hip

Calculate the rise per metre of the roof divided by 10, and mark on vertical line Rise/m 10 Connect points to develop bevels Plumb bevel common rafter 2.Level bevel common rafter 4.Plumb bevel hip 5.Level bevel hip

100mm 141.4mm 1.Plumb bevel common rafter 2.Level bevel common rafter 3.Edge bevel common rafter 4.Plumb bevel hip 5.Level bevel hip 6.Edge bevel hip 8. Edge bevel purlin Project a 100mm line perpendicular to the inclined line on the rafter side Project a 141.4mm line perpendicular to the inclined line on the hip side Connect points to form bevels

1.Plumb bevel common rafter 2.Level bevel common rafter 3.Edge bevel common rafter 4.Plumb bevel hip 5.Level bevel hip 6.Edge bevel hip 7. Face bevel purlin 8. Edge bevel purlin Rise 7 On the rafter side mark a point equal to the rise on the 100mm triangle Connect points to form bevels

Produced by : John Friedman