Truncated Girder Truss
A plated timber truncated girder truss: a ceiling tie, two rafters that stop at a flat top chord so the hip and jack trusses can fly over it, a post under each rafter end and a W of webs between, drawn as members without connector plates. Span, pitch and overhang, 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 | 9000 | mm |
| Pitch | 31 | ° |
| 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.cos((pitch * Math.PI / 180)) | mm |
| Width | span + 2 * overhang | mm |
| Depth | chordThickness | mm |
| Height | (span * 0.34 * slope) + heelHeight + overhang * slope | mm |