Z-Purlin & C-Purlin Steel

-- Steady & Reliable Manufacturer --

Introduction

Z-Purlin and C-Purlin Steel are essential secondary framing members in Pre-Engineered Metal Buildings (PEMB). Purlins support the roof and wall sheeting by spanning between the primary structural beams. Our purlins are cold-formed from high-strength galvanized steel (GI), ensuring they are lightweight yet capable of handling significant loads. Z-Purlins offer efficiency in continuous-span construction by allowing them to be overlapped, while C-Purlins are simpler and typically used for single-span applications or as wall girts.

We supply a full range of sizes, including pre-punched holes, ready for immediate bolt-up on site, accelerating project schedules.

Specifications

Parameter	Value/Range
Material	Hot-Dip Galvanized Steel (GI)
Steel Grade	G350, G450, G550 (High Tensile)
Thickness Range	1.5mm to 3.0mm
Web Height	100mm to 300mm
Coating Mass	Minimum Z120 g/m2 (Z180 or Z275 optional)
Hole Pattern	Customizable pre-punched hole diameters and spacing.
Section Length	Up to 12 meters (transport-dependent)

Structural Note: The high tensile strength steel (G350+) is vital for ensuring the purlin maintains its structural integrity across wide spans.

Application

Roof Support: The primary system for attaching metal roofing sheets to the main rafters.
Wall Girts: Horizontal members used in walls to provide lateral support for wall cladding panels.
Mezzanines: Secondary beams and joists for light-duty floor structures.
Solar Racks: Components for ground-mounted and rooftop solar panel support systems.

Advantages

Lightweight and High Strength: Cold-formed process uses steel efficiently, reducing overall building weight.
Rapid Assembly: Pre-punched holes eliminate on-site drilling, ensuring fast, accurate erection.
Cost-Efficiency: More economical than hot-rolled sections for secondary framing applications.
Versatility: Z-purlins can be nested and overlapped for continuous beam performance, maximizing span distance.

Payment & Shipping

Bundling: Purlins are packaged in tightly strapped bundles, labeled by length and profile, corresponding to project erection drawings.
Accessories: We can include all necessary accessories, such as sag rods, bracing systems, and connection bolts, in the shipment.
Design Support: Our team can assist with load calculations and optimizing purlin spacing for specific building codes and load requirements (wind, snow).

Frequently Asked Questions

Q: What is the maximum suggested span for a Z-purlin?
A: Typical continuous spans for standard Z-purlins range from 5 to 7.5 meters, depending heavily on the steel grade, web height, and applied roofing loads.

Q: Do the punched holes compromise the strength of the purlin?
A: The hole sizes and locations are engineered to minimize stress concentration. They are essential for non-structural connection and have been accounted for in standard load-bearing tables.

CONTACT WITH US

Zhejiang Tiannv Color Steel Co., Ltd.

Enjoying good reputation from all the customers worldwide, we are the reliable partner you can trust in China.

Zhejiang Tiannv Color Steel Co., Ltd was established in January 2003, located in Zhejiang Province, which is a Sino-Hong Kong joint venture with a registered capital of 50 million RMB. As China Z-Purlin & C-Purlin Steel Manufacturers and Z-Purlin & C-Purlin Steel Factory, the company covers an area of 50000㎡, and a workshop area of 12000㎡. Company’s main products are hot galvanized steel coil, aluzinc coil, prepainted steel coils (PPGI / PPGL), prepainted aluminum coil, printed PPGI for household appliance, roofing/corrugated PPGI sheet, and PPGI paint. Currently, we have 85 skilled employees, 5 professional engineers and 15 experienced office personnel. The manufacture capability of our production line is nearly 100,000 metric tons per year.

Our company produces high quality color coated steel, and imposes strict quality control over the prepainted steel coils. We use good quality hot-dip galvanized steel coils or Alu-Zinc coated steel coils as base sheet and strictly select coated paints, which gives quality promise to customers and competitive advantage for our company.

Recommended LINS: Color Coated Steel Sheets 120g/m² Zinc Coated Steel Prepainted Galvanized Steel Coils (PPGI)