Standard Sleeved Purlin Run
A run of steel zed purlins joined by inverted zed sleeves at the second rafter from each end and at alternate joints on the inner bays, bolted to cleats at every support and braced by anti-sag rods between the lines. Bays along the run and the bay span, Rafter length and the largest line spacing, Purlin depth and thickness, Cleat width and anti-sag rod rows, Frame section depth and column height
Details
Category: Roof Framing › Steel Purlins › Purlin and Girt Runs
By Huu Khanh Nguyen · Updated November 5, 2026
Parameters
| Name | Default | Unit |
|---|---|---|
| Bays | 6 | |
| Bay Span | 6000 | mm |
| Rafter Length | 3600 | mm |
| Largest Line Spacing | 1200 | mm |
| Purlin Depth | 203 | mm |
| Purlin Thickness | depth == 203 ? 1.9 : 2.4 | mm |
| Cleat Width | 75 | mm |
| Bridging Rows | 2 | |
| Finish | steelZincAluminium | |
| Frame Section Depth | Math.round(2.5 * depth / 50) * 50 | mm |
| Column Height | 6000 | mm |
| Run Length | bayCount * span + 2 * Math.max(0.525 * frameDepth, cleatWidth / 2) | mm |
| Height | cleatGap + depth + frameDepth + columnHeight + Math.round(frameDepth / 20) | mm |
| Line Intervals | Math.ceil(rafterLength / maximumSpacing) | |
| Line Spacing | rafterLength / lineIntervals | mm |
| Cleat Gap | depth <= 250 ? 10 : 20 | mm |