Truncated Standard Truss
A plated timber truncated standard truss: a ceiling tie, two rafters that stop in vertical cuts, a flat top chord between them so the hip and jack trusses can fly over it, and six webs forming a W under the flat chord with a raking web at each end, drawn as members without connector plates. The cut height sets where the truss stands between the truncated girder and the ridge end of a hip end. Span, pitch and overhang, Cut height, Member thickness and chord and web depths
Details
Category: Roof Framing › Timber Roof Framing › Hip Truss Roofs › Hip Set Trusses
By Huu Khanh Nguyen · Updated November 4, 2026
Parameters
| Name | Default | Unit |
|---|---|---|
| Span | 8000 | mm |
| Pitch | 25 | ° |
| Overhang | 450 | mm |
| Member Thickness | 35 | mm |
| Chord Depth | 97 | mm |
| Web Depth | 70 | mm |
| Slope | Math.tan((pitch * Math.PI / 180)) | |
| Heel Height | chordDepth * Math.sqrt(1 + slope * slope) | mm |
| Cut Height | 0.417 * span * slope | mm |
| Outer Node Ratio | 0.197 / 0.417 | |
| Tie Node Ratio | 0.263 / 0.417 | |
| Cut Position | cutHeight / slope | mm |
| Width | span + 2 * overhang | mm |
| Depth | chordThickness | mm |
| Height | cutHeight + heelHeight + overhang * slope | mm |