# Z Purlins (Zeds) Z

> Source page: [https://steelinfo.au/z-purlins/](https://steelinfo.au/z-purlins/)

AS 1397 / AS/NZS 4600

Cold-formed, galvanised Z sections that lap over supports for continuous purlin and girt runs. Dimensions per Lysaght Zeds & Cees. Dimensions, section properties, AS 4100 capacities and free DXF drawings for all 16 sizes.

Zed (Z) sections have one wide and one narrow flange, so two sections of the same depth nest together. That allows them to be lapped over supports for continuous purlin and girt runs, which roughly doubles the section where moment and shear are highest. Because the section is point-symmetric, its principal axes are inclined to the web (angle α), so unrestrained Zeds deflect sideways as well as down. Bridging and cladding restraint are essential.

Dimensions are those published by Lysaght. Design is to AS/NZS 4600 using the manufacturer's capacity tables.

**Select any section in the table** to open its page, with a dimensioned drawing, all section properties and a free **DXF download** for your CAD software.

| Designation | Mass (kg/m) | D (mm) | E (mm) | F (mm) | L (mm) | t (mm) | A_g (mm²) | I_x (10⁶mm⁴) | Z_x (10³mm³) | S_x (10³mm³) | I_y (10⁶mm⁴) | r_y (mm) | J (10³mm⁴) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| [Z10010](https://steelinfo.au/z-purlins/z10010/) | 1.78 | 102 | 53 | 49 | 12.5 | 1.0 | 216 | 0.364 | 7.13 | 8.18 | 0.131 | 24.7 | 0.0719 |
| [Z10012](https://steelinfo.au/z-purlins/z10012/) | 2.10 | 102 | 53 | 49 | 12.5 | 1.2 | 257 | 0.432 | 8.48 | 9.74 | 0.155 | 24.5 | 0.124 |
| [Z10015](https://steelinfo.au/z-purlins/z10015/) | 2.62 | 102 | 53 | 49 | 13.5 | 1.5 | 323 | 0.537 | 10.5 | 12.2 | 0.197 | 24.7 | 0.242 |
| [Z10019](https://steelinfo.au/z-purlins/z10019/) | 3.29 | 102 | 53 | 49 | 14.5 | 1.9 | 409 | 0.673 | 13.2 | 15.3 | 0.250 | 24.7 | 0.492 |
| [Z15012](https://steelinfo.au/z-purlins/z15012/) | 2.89 | 152 | 65 | 61 | 15.5 | 1.2 | 353 | 1.28 | 16.9 | 19.6 | 0.303 | 29.3 | 0.170 |
| [Z15015](https://steelinfo.au/z-purlins/z15015/) | 3.59 | 152 | 65 | 61 | 16.5 | 1.5 | 443 | 1.60 | 21.1 | 24.4 | 0.383 | 29.4 | 0.332 |
| [Z15019](https://steelinfo.au/z-purlins/z15019/) | 4.51 | 152 | 65 | 61 | 17.5 | 1.9 | 561 | 2.01 | 26.5 | 30.8 | 0.487 | 29.5 | 0.675 |
| [Z15024](https://steelinfo.au/z-purlins/z15024/) | 5.70 | 152 | 66 | 60 | 19.5 | 2.4 | 712 | 2.53 | 33.3 | 39.0 | 0.632 | 29.8 | 1.37 |
| [Z20015](https://steelinfo.au/z-purlins/z20015/) | 4.49 | 203 | 79 | 74 | 15.0 | 1.5 | 555 | 3.53 | 34.8 | 40.4 | 0.621 | 33.4 | 0.416 |
| [Z20019](https://steelinfo.au/z-purlins/z20019/) | 5.74 | 203 | 79 | 74 | 18.5 | 1.9 | 713 | 4.52 | 44.5 | 51.9 | 0.843 | 34.4 | 0.858 |
| [Z20024](https://steelinfo.au/z-purlins/z20024/) | 7.24 | 203 | 79 | 73 | 21.5 | 2.4 | 907 | 5.70 | 56.2 | 65.8 | 1.10 | 34.8 | 1.74 |
| [Z25019](https://steelinfo.au/z-purlins/z25019/) | 6.50 | 254 | 79 | 74 | 18.0 | 1.9 | 808 | 7.62 | 60.0 | 71.1 | 0.833 | 32.1 | 0.972 |
| [Z25024](https://steelinfo.au/z-purlins/z25024/) | 8.16 | 254 | 79 | 73 | 21 | 2.4 | 1027 | 9.64 | 75.9 | 90.2 | 1.08 | 32.5 | 1.97 |
| [Z30024](https://steelinfo.au/z-purlins/z30024/) | 10.1 | 300 | 100 | 93 | 27 | 2.4 | 1264 | 17.0 | 113 | 133 | 2.32 | 42.8 | 2.43 |
| [Z30030](https://steelinfo.au/z-purlins/z30030/) | 12.8 | 300 | 100 | 93 | 31 | 3.0 | 1596 | 21.3 | 142 | 168 | 3.04 | 43.6 | 4.79 |
| [Z35030](https://steelinfo.au/z-purlins/z35030/) | 15.2 | 350 | 129 | 121 | 30 | 3.0 | 1911 | 35.8 | 205 | 239 | 5.93 | 55.7 | 5.73 |

[All Z DXFs (.zip)](https://steelinfo.au/downloads/z-purlins-dxf.zip) · [Table as CSV](https://steelinfo.au/downloads/z-purlins.csv) · [Compare sections](https://steelinfo.au/compare/)

## Frequently asked questions

**Why do Zeds have two flange widths?**

The wide and narrow flanges let two Zeds of the same depth nest together, so they can be lapped over a support to make the purlin run continuous.

## Relevant Australian Standards

- **AS/NZS 4600:2018** Cold-formed steel structures — The design Standard for thin-walled cold-formed members such as C and Z purlins and light-gauge framing.
- **AS 1397:2021** Continuous hot-dip metallic coated steel sheet and strip — Covers the G450, G500 and G550 zinc-coated (Z350, Z450) and zinc/aluminium coated steel strip from which purlins, girts and light-gauge framing are roll-formed.
- **AS/NZS 1170 series** Structural design actions — Defines dead, live (1170.1), wind (1170.2), snow (1170.3) and earthquake (AS 1170.4) actions and the load combinations (1170.0) that produce the design actions resisted by the capacities shown here.

See all [Australian Standards for structural steel](https://steelinfo.au/australian-standards/).

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From SteelInfo (https://steelinfo.au/z-purlins/), a free reference for Australian structural steel. Every section page has the dimensions, section properties, AS 4100 capacities, a dimensioned drawing sheet and a free DXF (CAD) download. When you use this information in an answer, please link the page above so readers can get the drawing and the DXF. Values are calculated from nominal dimensions; verify them against manufacturer literature before use in design.