Integrated Roof and Wall Support Solution

The ZSJH Steel Purlin System is developed for projects that require lightweight secondary framing, accurate connections and efficient on-site assembly. It creates a stable supporting framework between the primary steel structure and the building envelope, helping roof sheets and wall panels remain properly aligned.

Our purlins are roll-formed from selected steel coils and fabricated according to approved project documents. C sections, Z sections, wall girts, eave members and related accessories can be supplied as an integrated package, reducing the need to purchase building components from multiple suppliers.

How the Purlin System Works

Purlins are installed between the main rafters to support the roof covering and transfer roof loads to the primary frame. Wall girts perform a similar function between steel columns, providing attachment points for exterior cladding.

A properly coordinated purlin system contributes to:

• Stable roof and wall panel support

• Uniform spacing between secondary members

• Efficient load transfer to the main structure

• Easier installation of cladding and insulation

• Reduced on-site cutting and drilling

• Improved overall construction efficiency

The final section size, steel thickness and spacing must be selected according to the approved structural design.

Section Selection

C Sections for Simple Framing

C sections are suitable for individual bays, wall framing, openings, edge members and other locations where members do not need to overlap. Their symmetrical installation direction makes them convenient for many standard building arrangements.

Z Sections for Continuous Spans

Z sections can be lapped over the main rafters to form a continuous framing line. This arrangement improves continuity across multiple bays and is commonly used in large industrial roofs, warehouses and pre-engineered steel buildings.

Wall Girts and Eave Members

Wall girts provide horizontal support for exterior panels, while eave members help create the transition between the roof and wall systems. These components can be produced with matching connection details for coordinated installation.

Manufacturing Options

Performance Advantages

Efficient Use of Steel

Cold-formed sections provide a practical strength-to-weight balance. Their optimized profiles help reduce unnecessary material weight while maintaining the performance required by the building design.

Consistent Connection Accuracy

Computer-controlled cutting and punching improve the consistency of member lengths and connection holes. This helps purlins align with rafters, columns, cleats and other structural components during assembly.

Faster Construction

Pre-cut and pre-punched components reduce secondary processing on site. Installation teams can position and bolt the members according to the erection drawings, helping shorten roof and wall framing work.

Flexible Project Configuration

The system can be adapted to different frame spacings, roof slopes, panel types, building dimensions and environmental conditions. Orders may include several profiles, lengths and hole patterns within the same project.

Transport-Saving Design

C and Z sections can be stacked or nested into compact bundles. This improves space utilization during container loading and makes the products easier to count, unload and distribute at the construction site.

Compatible Building Envelope Materials

The Steel Purlin System can be coordinated with:

• Corrugated metal roofing sheets

• Insulated sandwich roof panels

• Standing seam roofing systems

• Single-skin wall cladding

• Insulated metal wall panels

• Thermal insulation layers

• Interior ceiling systems

• Flashings and roof accessories

Advantages of Factory-Direct Supply

ZSJH Steel provides coordinated manufacturing and export services for international steel building projects.

Our service advantages include:

• Production based on customer drawings

• Factory-direct pricing

• Multiple section profiles in one order

• CNC cutting and punching

• Project-specific component marking

• Matching accessories available

• Controlled production inspection

• Container loading coordination

• Seaworthy export bundling

• Technical communication throughout the order

FAQ

Can one project include both C and Z sections?

Yes. Different profiles can be supplied within the same order according to their positions and functions in the building.

Can purlins be supplied for sandwich panels?

Yes. The purlin layout and connection arrangement can be coordinated with insulated roof and wall panels. Panel loads and fastener requirements should be considered during structural design.

Can you produce purlins without holes?

Yes. Purlins can be supplied without holes or with project-specific CNC-punched holes.

Can every bundle be marked by building zone?

Yes. Bundles can be identified according to roof area, wall elevation, grid line or erection sequence when clear marking instructions are provided.

Can you supply replacement members?

Replacement or additional members can be manufactured when complete section, length, material and hole information is available.

How do you protect galvanized surfaces during transportation?

The members are arranged into stable bundles and secured for transportation. Additional wrapping or protection can be applied based on the shipping method and customer requirements.

What should I send for an accurate quotation?

Please provide section drawings, material grade, steel thickness, member lengths, hole details, quantities, coating requirements and delivery location. A bill of materials or complete purlin schedule will help us prepare a more accurate offer.