ZSJH Steel provides customized C purlins, Z purlins, galvanized steel purlins, roof purlins and wall girts for industrial warehouses, workshops, factories, logistics centers, agricultural buildings and pre-engineered steel buildings.

Manufactured from cold-formed or galvanized structural steel, our purlin systems offer a high strength-to-weight ratio, accurate dimensions and efficient installation.

Dimensions, thicknesses, hole positions, lengths and surface treatments can be customized according to project drawings and structural requirements.

Main Purlin Types

C Purlin

C-shaped steel purlins are commonly used for roof framing, wall framing and secondary structural systems.

Typical applications include:

• Roof purlins

• Wall girts

• Mezzanine framing

• Industrial building framing

• Steel warehouse structures

C purlins are especially suitable for relatively simple spans and structural layouts.

Z Purlin

Z purlins are designed for efficient overlapping at supports, allowing continuous structural systems across multiple spans.

Typical applications:

• Long-span roofing systems

• Industrial warehouses

• Steel factories

• Logistics centers

• Pre-engineered buildings

• Commercial steel buildings

The overlapping design can improve structural continuity while reducing overall steel consumption in suitable projects.

Typical Product Specifications

Key Features

High Strength-to-Weight Ratio

Cold-formed steel purlins provide reliable structural capacity while maintaining relatively low self-weight, helping optimize the overall steel building system.

Accurate Dimensions

Computer-controlled production helps maintain consistent section dimensions, hole positioning and cutting length for easier installation.

Fast Installation

Pre-cut and pre-punched purlins can be directly connected on site using bolts, reducing secondary processing and installation time.

Corrosion Protection

Galvanized surface treatment provides improved resistance against moisture and atmospheric corrosion.

Flexible Customization

Section dimensions, thickness, length, punching layout and surface treatment can all be produced according to customer drawings.

Efficient Steel Consumption

Optimized C and Z sections provide structural support with less material compared with many traditional heavier sections.

Steel Purlin System Components

A complete steel building secondary framing system can include:

• C Purlins

• Z Purlins

• Roof Purlins

• Wall Girts

• Eave Struts

• Bracing Rods

• Sag Rods

• Tie Rods

• Connection Plates

• Bolts & Fasteners

• Roof Supporting Members

• Wall Supporting Members

We can supply these components as individual products or as part of a complete steel building package.

Manufacturing Process

Our typical steel purlin manufacturing process includes:

Raw Material Inspection → Coil Feeding → Leveling → Roll Forming → Cutting → Hole Punching → Dimension Inspection → Surface Inspection → Packing → Shipment

Each production stage can be controlled according to customer drawings and project specifications.

Custom Fabrication Service

ZSJH Steel supports customized production according to:

• CAD drawings

• Structural drawings

• Shop drawings

• Material specifications

• Section dimensions

• Hole layouts

• Connection details

• Project load requirements

Customers can send us their drawings or required specifications for quotation and fabrication evaluation.

Surface Treatment

Depending on project requirements, steel purlins can be supplied with different surface finishes.

Galvanized

Suitable for applications requiring improved corrosion resistance.

Painted

Different coating systems can be selected according to project environments.

Customized Coating

Surface treatment can be customized according to environmental conditions and customer specifications.

Advantages of Our Steel Purlin System

Customized Production
Manufactured according to project drawings and specifications.

Factory-Controlled Quality
Dimensions, hole positions and surface quality are inspected during production.

Complete Steel Building Supply
Purlins can be supplied together with steel beams, columns, bracing systems, roof panels and accessories.

Export Packing Support
Components can be clearly marked and packed according to project installation sequence.

Engineering Support
Our team can assist with drawing review, fabrication detailing and production coordination.

Global Project Supply
Suitable for steel construction projects requiring prefabricated components and international shipping.

FAQ

1. What is a steel purlin?

A steel purlin is a horizontal secondary structural member used to support roof sheets, wall panels and other building envelope components in steel buildings.

2. What is the difference between C and Z purlins?

C purlins have a C-shaped section and are widely used for roof and wall framing. Z purlins can overlap at supports, making them particularly suitable for continuous and multi-span roof systems.

3. Can you customize the purlin dimensions?

Yes. Height, width, flange dimensions, thickness, length and hole positions can be customized according to project drawings.

4. Can you supply galvanized purlins?

Yes. Galvanized steel purlins are available for projects requiring improved corrosion resistance.

5. Can holes be pre-punched before delivery?

Yes. Bolt holes and connection holes can be pre-punched according to approved drawings.

6. What steel grades are available?

Common carbon structural steel grades and galvanized steel materials can be provided according to project requirements. Equivalent international grades can also be discussed based on the project specification.