Behind every well-built industrial roof is a structural framework that holds it all together — and Z and C Purlins from Astal Roofing Industries are engineered precisely for that role. Manufactured from high tensile steel and cold-formed to tight dimensional tolerances, our purlins provide the secondary structural support that roofing sheets, wall cladding, and other envelope elements depend on. Widely used by structural engineers, fabricators, and EPC contractors across India, our Z and C Purlins deliver the strength-to-weight advantage that modern industrial construction demands.
What Are Z and C Purlins?
Z Purlins and C Purlins are cold-formed steel sections used as horizontal structural members — typically spanning between primary rafters or portal frames — to support roofing sheets and wall cladding panels. The cross-sectional shape of each profile determines its structural behaviour: Z Purlins are preferred for continuous spans where sections can be lapped for added stiffness, while C Purlins are commonly used for single-span applications and eave or verge conditions.
Both profiles are manufactured from high tensile steel coil and cold-rolled to precise dimensions, offering significantly better structural efficiency compared to traditional hot-rolled sections — meaning lighter member sizes, reduced foundation loads, and faster fabrication and installation times on site.
Key Features & Technical Advantages
High Tensile Steel Construction
Manufactured from high tensile steel with yield strengths typically ranging from 345 MPa to 550 MPa — delivering superior load-bearing capacity in thinner, lighter sections compared to standard mild steel alternatives.
Thickness Range
Range: 1.5 mm to 3.0 mm: Available across a wide gauge range to match varying span lengths, load requirements, and design specifications — giving structural engineers the flexibility to optimise member sizing for each project without being constrained by standard stock sizes.
Lightweight Yet Structurally Strong
Cold-formed steel sections offer an exceptional strength-to-weight ratio — reducing the dead load on primary structural frames, cutting crane and handling requirements on site, and lowering overall steel tonnage without compromising structural performance.
Easy to Install
Punched with standard fixing holes at pre-set centres, Z and C Purlins are designed for fast, accurate installation — reducing labour time on site and enabling precise alignment of roofing sheets and cladding panels across large roof spans.
Corrosion-Resistant Finish
Available in Custom Sizes & Lengths
Z Purlin vs C Purlin — Which One Do You Need?
Both profiles serve as secondary structural members, but the choice between Z and C depends on your application:
Z Purlins
Z Purlins are used in continuous multi-span roof systems where sections are lapped at rafter positions — the overlapping Z profile creates a stiffer, more efficient structural arrangement suited to longer spans and heavier roofing loads.
C Purlins
Our team can assist with profile selection based on your structural drawings and span requirements — ensuring the right section is specified from the outset.
Applications
- Pre-engineered buildings (PEB) and portal frame structures
- Industrial sheds, factories, and manufacturing plants
- Warehouses, logistics parks, and distribution centres
- Commercial buildings, retail outlets, and showrooms
- Agricultural structures and rural storage facilities
- Wall cladding and façade support systems
Why Source Purlins from Astal Roofing?
At Astal Roofing Industries, Z and C Purlins are manufactured at our KIADB facility in Bengaluru using prime high tensile coil processed through precision cold-roll forming lines. Each section is checked for dimensional accuracy, web depth, flange width, and hole pitch before dispatch — so what arrives on site is ready to install without rework or adjustment.
We supply directly to fabricators, EPC contractors, and structural steel companies across India, with the capacity to handle both project-specific orders and ongoing supply arrangements. Competitive pricing, consistent quality, and reliable delivery timelines are what our clients return for — order after order.
