What Are Z Purlins?

WHAT ARE Z PURLINS?

Z purlins or zed purlins are horizontal beams that are designed to form the roof and wall joists of a building shell structure (also view our C section purlins page). They sit between the roofing sheets and the building, acting as a support for the sheet to ensure it is firmly attached and safely in place.

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Our Z purlins are most commonly used in agricultural and industrial buildings due to their extremely versatile and lightweight properties which make them easily adapted for use in a variety of different sized buildings.

SIZES

At Rhino Steel Cladding we stock Z purlins in a wide range of thickness which can be manufactured to your precise requirements up to 8m (26.25 feet) in length. We can also supply them un-drilled or with pre-drilled holes at 18mm diameter (small hole sizes available on request).

Our full range of thickness available for Z purlins are:

• 1.2mm
• 1.3mm
• 1.4mm
• 1.5mm

• 1.6mm
• 1.8mm
• 2.0mm
• 2.5mm

With a choice of the following heights:

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ACCESSORIES

We also supply the full range of purlin accessories including:

• C section purlins
• Eaves beams
• Side rails
• Anti-sag bars
• Anti-sag rods
• Cleader angles
• Sleeves
• Cleates

The diagram below shows Z purlins (with cleats) used to form the complete shell of a building:

Z SECTION PROPERTIES

DO YOU NEED PURLINS FOR YOUR BUILDING PROJECT?

Call our friendly sales team on for more information or to place your over the or purchase your purlins and accessories on our online shop.

ORDER YOUR PURLINS

where:
I = 2nd moment of inertia wrt the relevant bending axis
y = distance from the neutral axis to the extreme fiber of the beam (ie top or bottom of beam)

There are some sources out there that list Z for various structural shapes. AISC Steel Construction Manual lists Z for all of the ASTM A6 shapes, but I don't know where you can find similar listings for metric shapes.

To calculate I from the page you reference, you have several options. First, you can approximate I by calculating I for the web and two flanges about their centroids, then transforming them to the section centroid (Ic = I + Ad^2). Or, vastly easier, is to just draw the section in a 2D Cad program. It can calculate those values for you.

Are you interested in learning more about Steel Z Beam? Contact us today to secure an expert consultation!