Gnee Steel (Tianjin) Co., Ltd. is one of the most reliable manufacturers and suppliers of galvanized z type channel steel purlin beams z shaped section in China. Welcome to wholesale customized galvanized z type channel steel purlin beams z shaped section at low price from our factory. If you have any enquiry about free sample and cheap products, please feel free to email us.
What are Z Purlins?
Z purlins resemble the shape of a letter "Z" and are also referred to as Zee or Zed purlins. They are roof framing members that span parallel to the building eave and support the roof decking or sheeting. The metal purlins are in turn supported by rafters or walls.
Zed purlins are secondary steel framing members used for both roof and wall. Zee Purlins are commonly chosen for the ability to end lap.
Z Purlin Z Channel Specification
| Product name | Z Purlin Z Channel |
| Basic material | Carbon steel |
| Technique | Cold forming |
| Size | 80-300mm |
| Thickness | 1.5-3.0mm |
| Length | As customer's requirement |
| Surface treatment | Balck, Hot dipped galvanized |
| Material | Q195, Q215, Q235, Q345, etc. |
| Standard | AISI, ASTM, BS, DIN, GB, JIS |
| Certification | ISO9001, SGS, BV |
| Perforated | Is perforated or customized |
| OEM service | Support |
| Application | Steel strucytre, shelves, guardrails, vehicles, containers, doors and windows, furniture, bridges, etc. |
| Remark | Payment terms: T/T, L/C |
| Terms of trade: FOB, CFR, CIF, DDP, EXW | |
| Delivery time: within 25-35 days after payment. |
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Why Purlins Are Used in Metal Buildings
Purlins add to the structural integrity of a building's roof by running perpendicular to the rafter beams (see adjacent image).
So why are purlins used in metal buildings? There are 3 structural functions provided by purlins for metal roofing.
Purlins tie the rafters together, which stabilizes and reinforces the frame.
Purlins provide additional support between the spans of the separate framing bays,
Purlins improve the roof's resistance to excessive rain, snowfall, and any other temporary loads that might be exerted on the roof.
Products Description
1.What are Z purlins, and what are they used for?
Z purlins are cold-formed steel beams shaped like the letter "Z." They are primarily used in metal building construction to support roof and wall panels, transferring the load to the main structural frame.
2.What is the difference between C purlins and Z purlins?
Lapping: Z purlins can be overlapped (lapped) to create a continuous beam, whereas C purlins are usually used in simple spans (butt-jointed).
Strength: Due to the lapping capability, Z purlins are stronger for large-span and heavy-load applications.
Roof Pitch: Z purlins often provide better structural balance on steeply pitched roofs.
3.What are the standard sizes for Z purlins?
Common depths (heights) range from 100mm to 350mm, with thicknesses typically between 1.5mm and 3.0mm.
How do I choose the right size and thickness for my project? Selection depends on the column spacing (span), the weight of the roofing material, and local environmental factors like snow and wind loads. Structural engineering calculations are always recommended.
4.What is "Lapping" in Z purlins, and why is it important?
Lapping is the process of nesting one Z purlin inside the end of another. This doubles the thickness at the support points, increasing load capacity and reducing deflection.
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