Fan Truss
A plated timber fan truss: two rafters, a ceiling tie, a post and a long web from each third point of the tie, and a raking web from each third point to the rafter, drawn as members without connector plates.
Details
Category: Roof Framing › Timber Roof Framing › Straight Truss Roofs › Timber 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 / 2 + overhang) * slope + heelHeight | mm |