C & Z Purlin
C & Z Purlin
I&I Engineering Infra – C & Z Purlins
I&I Engineering Infra is one of the leading manufacturers of C & Z Purlins. Purlins act as critical structural members designed to support roofing sheets and transfer loads safely to the primary structure.
Our purlins are engineered considering wind parameters and roof load-carrying capacity to ensure structural safety and durability.
We offer a wide range of GI and GP Purlins available in both C and Z shapes.
Easy to install
Superior tensile strength
Highly durable
Easy handling
Abrasion and corrosion resistant
Available in both C & Z shapes
Available in standard and customized specifications
Specifications:
Properties & Dimensions
| Material | GP & GI, Skin Pass & HR |
|---|---|
| Length & Width | As per order requirement |
| Thickness | 1.6 mm, 1.8 mm, 2 mm, 2.5 mm, 3 mm & up to 4 mm |
High Tensile Galvanized I&I Engineering Infra Z-Purlins
Properties & Dimensions
| Sr. No. | Height (mm) | Flange (mm) | Lip (mm) | Thickness (mm) | Area (cm²) | Weight (kg/m) | Ixx (cm⁴) | Iyy (cm⁴) | Zxx (cm³) | Zyy (cm³) | Rxx (cm) | Ryy (cm) | Cyy (cm) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 152 | 42 | 15 | 1.6 | 4.27 | 3.35 | 126.15 | 25.16 | 18.02 | 5.11 | 5.44 | 2.43 | 4.92 |
| 2 | 180 | 60 | 15 | 1.8 | 5.49 | 4.31 | 255.11 | 27.75 | 28.35 | 5.65 | 6.82 | 2.25 | 4.91 |
| 3 | 200 | 60 | 20 | 2.0 | 6.87 | 5.39 | 400.72 | 48.61 | 40.07 | 8.24 | 7.64 | 2.66 | 5.90 |
| 4 | 240 | 74 | 24 | 2.5 | 9.98 | 7.84 | 828.88 | 87.67 | 69.07 | 12.75 | 9.11 | 2.96 | 6.88 |
| 5 | 300 | 80 | 24 | 3.0 | 13.65 | 10.72 | 1670.22 | 100.98 | 111.35 | 14.74 | 11.06 | 2.72 | 6.85 |
High Tensile Galvanized I&I Engineering Infra C-Purlins
Properties & Dimensions
| Sr. No. | Height (mm) | Flange (mm) | Lip (mm) | Thickness (mm) | Area (cm²) | Weight (kg/m) | Ixx (cm⁴) | Iyy (cm⁴) | Zxx (cm³) | Zyy (cm³) | Rxx (cm) | Ryy (cm) | Cyy (cm) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 140 | 45 | 18 | 1.6 | 3.47 | 2.72 | 53.41 | 10.68 | 10.68 | 3.75 | 3.92 | 1.76 | 1.65 |
| 2 | 180 | 70 | 20 | 1.8 | 4.59 | 3.60 | 131.65 | 13.25 | 18.81 | 4.28 | 5.35 | 1.70 | 1.40 |
| 3 | 200 | 60 | 20 | 2.0 | 6.87 | 5.39 | 400.72 | 32.13 | 40.07 | 7.39 | 7.64 | 2.16 | 1.65 |
| 4 | 240 | 74 | 24 | 2.5 | 9.98 | 7.84 | 828.88 | 59.35 | 69.07 | 11.43 | 9.11 | 2.44 | 1.81 |
| 5 | 300 | 78 | 26 | 3.0 | 13.65 | 10.72 | 1670.22 | 72.82 | 111.35 | 13.45 | 11.06 | 2.31 | 1.59 |
Note: Sectional properties can be provided as per project requirements.
Available purlin section sizes:
Height: 80 mm to 300 mm
Flange: 45 mm to 80 mm
Lip: 15 mm to 25 mm
Thickness: 1.2 mm to 3 mm
What are Roofing Purlins?
Purlins are horizontal structural members installed within the roof frame to support roofing sheets. They span across rafters or primary beams, distributing roof loads evenly and enhancing overall structural stability.
PVC sheets are flexible, lightweight, and adaptable for various roofing and cladding needs.
uPVC sheets are rigid, stronger, and engineered for long-term structural durability.
Both materials are resistant to corrosion, moisture, chemicals, and harsh weather conditions, making them ideal for long-lasting roofing systems.
What are the Types of Roofing Purlins?
C-Channel Purlins: C-shaped sections that are strong, versatile, and easy to install.
Z-Channel Purlins: Z-shaped sections ideal for larger spans and higher load capacity applications.
Sigma Purlins: Sigma-shaped profiles used in specialized structural systems.
Box Purlins: Closed sections providing additional strength for heavy-duty industrial structures.
Why are Purlins Essential in a Roofing System?
Ensure structural stability and roof integrity
Distribute loads evenly to rafters or beams
Enhance strength for large-span buildings
Reduce the need for additional structural supports
Improve overall project cost efficiency
Materials Used for Manufacturing Purlins
Galvanized Steel: High strength with excellent corrosion resistance
Aluminum: Lightweight and resistant to corrosion, suitable for coastal areas
Timber: Used in traditional or lightweight structures
Cold-Formed Steel: Durable and cost-effective for modern construction
Material selection depends on load requirements, environmental conditions, and project budget.
Lifespan of Purlins
Galvanized steel and aluminum purlins typically have a lifespan of 30–50 years or more with proper maintenance. Regular inspections and protective treatments significantly extend durability.
Contribution to Energy Efficiency
Provide space for insulation installation
Improve thermal performance of the roof
Help maintain indoor temperature stability
Reduce heating and cooling energy costs
Installation Process
Install primary beams or rafters at proper spacing
Position purlins horizontally between structural members
Secure using bolts or welding as per design requirements
Fix roofing sheets over the purlins
Maintain correct alignment and spacing to prevent sagging
Parameters to Consider When Selecting Purlins
Load-bearing capacity
Building dimensions and span length
Material type and thickness
Spacing requirements
Corrosion resistance based on environment
Cost of Purlins for Roofing Systems
Pricing depends on material type, section size, thickness, and project scale. Steel purlins are generally more economical compared to aluminum or timber options. I&I Engineering Infra provides competitive pricing and customized quotations based on project specifications.
Suitability for Roof Types
Metal roofing systems
Commercial and industrial buildings
Residential roofing structures
Compatible with flat, pitched, and corrugated roofs
Maintenance Guidelines
Conduct periodic inspections for rust or structural damage
Remove debris to prevent moisture accumulation
Repaint or recoat exposed steel sections when required
Replace damaged or loose components promptly
Why Choose I&I Engineering Infra for Purlins?
High-quality and durable materials
Precision manufacturing and supply
Customized solutions based on structural requirements
Competitive pricing
Reliable technical support and project assistance
How to Begin Your Purlin Project?
Contact I&I Engineering Infra for a detailed consultation and project assessment. Our team will evaluate your structural requirements and provide a tailored solution.