Within a complete solar mounting system, purlins serve as core load transfer and bearing components. They connect rails to main columns, distribute loads from solar modules and stabilize the overall structure. Material selection, wall thickness specification, processing precision and corrosion resistance grade directly affect the structural safety and service life of PV power plants, making purlins critical components that cannot be overlooked during project design.
As an integrated manufacturer of solar mounting structures and supporting profiles, Zhongtang Group has years of expertise in PV structural engineering. Supported by in-house production lines and extensive overseas project experience, we provide global buyers with a comprehensive guide on key considerations for purlin selection, helping clients match products precisely to project requirements and avoid selection pitfalls and structural safety risks.
Zhongtang Group manufactures and customizes a full range of solar-specific purlins. Our main materials include national standard Q235B carbon steel and Q355B high-strength structural steel. Two premium surface treatments, hot-dip galvanizing and ZAM aluminum-zinc-magnesium coating, are available to suit different site conditions, meeting demands for both economical and high corrosion-resistant projects.
C-section purlins are our primary product, while custom special-shaped purlins are also available. Profile wall thickness can be precisely customized from 1.8 mm to 3.0 mm, covering load requirements for residential rooftop, commercial & industrial rooftop, large-scale ground-mounted power plants, and sites with heavy wind and snow loads. All purlins are produced by fully automatic continuous cold roll forming. The one-piece forming eliminates joints and welding stress, delivering excellent flatness, structural toughness and load-bearing capacity. Dimensional tolerances comply with top industry standards, effectively preventing on-site installation misalignment and poor fitting.
Zhongtang Group has a mature matching system for different project scenarios. For residential and small-to-medium commercial rooftop PV projects with small spans and limited roof load capacity, lightweight thin-wall purlins are recommended. They reduce roof load while maintaining structural safety, ideal for old roofs and color steel tile rooftops.
For large-span ground-mounted PV stations and harsh environments such as high wind/snow loads and high-altitude areas, Q355B thickened high-toughness purlins are adopted to greatly improve resistance against wind pressure, snow pressure and deformation, ensuring structural stability under extreme weather. For coastal corrosive environments, ZAM aluminum-zinc-magnesium coated purlins can be upgraded to enhance weather resistance.
To counter common industry defects of low-quality purlins including insufficient wall thickness, thin coating, large dimensional deviation, rusting and deformation, all Zhongtang purlins undergo strict mechanical property tests, hardness tests, coating thickness inspection and dimensional verification before delivery. Complete test reports and traceability documents are available for every batch.
We provide professional selection check and scheme optimization based on clients’ construction drawings, site parameters and local wind & snow load data. Purlins can be supplied as a complete package together with main brackets, rails, clamps and bolts, fulfilling bulk overseas procurement needs in one stop. With full-range production capacity, rigorous quality control and professional technical services, Zhongtang Group continues to supply safe, stable and cost-effective profile solutions for global PV projects.
