Purlin-Based vs. Purlin-Less Wall Systems in Industrial Buildings: A Technical Selection Guide

In modern industrial building envelope systems, wall structures significantly influence wind resistance, waterproof performance, construction efficiency, and architectural appearance.

Traditionally, purlin-based systems have been widely adopted, where purlins act as key secondary structural members connecting wall panels to the primary steel frame

. With continuous development in insulation materials, joint engineering, and structural analysis tools, purlin-less systems have become a reliable and widely applied alternative.

This article provides a technical comparison between the two systems.

1. Wind Resistance & Waterproof Performance

Purlin-Less System

In a purlin-less system, wall panels are directly fixed to structural columns using through-fasteners.

Key characteristics:

• Reduced number of joints and fasteners

• Improved system airtightness

• Lower risk of water leakage

However, longer panel spans require high-stiffness core materials such as structural rock wool to control deflection.

Purlin-Based System

In a purlin-based system, wall panels are fixed to purlins using concealed fasteners at tongue-and-groove joints.

Performance depends on:

• Joint engagement quality

• Sealing and installation precision

• System-level detailing

Advanced joint systems (such as staggered support profiles and reinforced sealing pads) can significantly improve wind and water resistance.

Application Guidance

• High wind / high rainfall regions, limited openings, column spacing ≤ 8m → Purlin-less system preferred

• Large column spacing or high façade opening density → Purlin-based system preferred

2. Installation Efficiency

Purlin-Less System

• Eliminates purlin installation

• Reduces construction steps

• Shortens project timeline

• Lower on-site labor demand

Purlin-Based System

• Requires sequential purlin installation

• Higher installation workload

• Longer construction duration

3. Aesthetic Performance

Purlin-Less System

• Smooth interior surface without exposed structural members

• Clean and minimal architectural appearance

Purlin-Based System

• Interior may expose purlins without liner panels

• Allows greater flexibility in exterior façade design

Conclusion

• Purlin-Based System: flexible design, suitable for large spans (≤12m), and diverse façade expressions

• Purlin-Less System: efficient installation, clean interior appearance, ideal for fast-track projects

Selection should be based on:

• Wind load requirements

• Column spacing

• Opening distribution

• Construction schedule

Wiskind Engineering Capability

Wiskind provides mature solutions for both purlin-based and purlin-less wall systems, with extensive application experience in global industrial projects.

These systems have been successfully implemented in manufacturing plants, cold storage facilities, and industrial complexes, delivering optimized performance in structural efficiency, thermal insulation, and architectural quality.