Pre-Engineered Buildings (PEBs) are a preferred solution for industrial and infrastructure projects across India. Warehouses, factories, logistics hubs, desalination plants, and agro facilities benefit from their fast construction, long-term durability, and cost efficiency.
However, the performance of a PEB building depends on the selection of three main components: cladding, purlins, and primary frames. Each of these components influences the structural safety, durability, thermal performance, and maintenance cost of your facility.
At Rostfrei Steels Pvt. Ltd., we manufacture precision-engineered PEB components designed for maximum reliability and performance across diverse industries and climates. This guide will help you choose the right cladding, purlins, and frames for your next project.
Importance of Cladding, Purlins & Frames
A PEB is a system where each element plays a critical role:
- Cladding: Acts as the outer layer protecting the building from weather, dust, corrosion, and temperature variations. Cladding also affects energy efficiency and aesthetics.
- Purlins: Secondary members that support roof and wall sheets, distributing the loads to the primary frame. Purlins ensure structural stability and cost optimization.
- Primary Frames: The main structural system including columns, rafters, and beams. It bears all operational and environmental loads, ensuring safety and longevity.
Choosing the right materials ensures durability, structural integrity, and long-term savings.
Selecting the Right Cladding
Cladding protects your building and contributes to energy efficiency and aesthetics. The choice depends on usage, environment, and durability requirements.
1) Single Skin Steel Cladding (PPGL, PPGI, )
- Lightweight, durable, and cost-effective
- Corrosion-resistant
- Fast installation
- Available in multiple colors and thicknesses
Best for: Warehouses, fabrication units, industrial sheds, storage facilities.
2) Insulated Sandwich Panels (PUF, PIR, Rockwool)
- High thermal insulation for temperature-sensitive applications
- PUF/PIR: energy-efficient, moisture-resistant-fire retardant.
- Rockwool: fire-resistant and durable
Best for: Cold storage, food processing, pharma facilities, cleanrooms. Slaughter house
3) FRP Cladding
- Ideal for chemical and corrosive environments
- Best for: Desalination plants, chemical plants, ETP/STP units.
4) Polycarbonate Skylight Sheets
- Allow natural daylight
- Reduce energy consumption
- UV-resistant and lightweight
Choosing the Right Purlins
Purlins are secondary steel members supporting the roof and walls. Choosing the correct type improves structural stability and reduces steel usage.
C-Purlins
- Economical and lightweight
- Suitable for short spans
- Best for side walls and small sheds
Z-Purlins
- Stronger, supports longer spans
- Can be overlapped for higher load capacity
- Ideal for warehouses and high wind-load areas
Rostfrei Advantage: High-quality cold-formed steel, corrosion-resistant coatings, precise dimensions, and perfect alignment with the main frame.
How you can select the primary frames?
The primary frame is the skeleton of the PEB. Frame design depends on building height, span, operational load, and environmental conditions.
Portal Frames
- Most common type
- Clear span construction
- Suitable for warehouses and workshops
Multi-Span Frames
- Used where intermediate columns are acceptable
- Cost-effective for smaller spans
Crane-Supported Frames
- Designed for buildings with cranes and heavy material handling
- Engineered for vibration and impact loads
Truss Frames
- Suitable for very large clear-span buildings like hangars or agricultural storage.
Factors to Consider: When selecting cladding, purlins, and frames:
- Environment: Coastal, high-humidity, or chemical areas require corrosion-resistant materials.
- Thermal Performance: Cold storage and food units need insulated panels.
- Structural Load: Wind, live, dead, and seismic loads must be considered.
- Budget vs Life Cycle: Long-term durability reduces maintenance costs.
- Aesthetic Preference: Color-coated panels,and cladding materials enhance the building appearance.
Why Choose Rostfrei Steels PEB Structures?
- High-tensile steel structures for industrial durability
- Wide range of cladding solutions: PPGL/PPGI, insulated panels, FRP, skylights
- Precision-engineered C and Z purlins
- In-house manufacturing ensures quality and timely delivery
- Engineering expertise compliant with IS, AISC, MBMA, and AISI standards
- Faster installation and project completion
- FM Approved ,CE Certifies,ISI 9001:2015 Approved.
- Latest Design software
Selecting the right cladding, purlins, and frames is critical for a safe, durable, and efficient PEB building. Rostfrei Steels Pvt. Ltd. offers engineered solutions tailored to your industry, location, and project requirements. From material selection to manufacturing and installation, we deliver structures built for strength, efficiency, and longevity.
FAQs:
Q1. What is the best cladding material for coastal areas?
PPGL or Galvalume coated steel panels are ideal due to their corrosion resistance and long life in coastal environments.
Q2. Should I use C or Z purlins for my warehouse roof?
Use C-purlins for shorter spans and lighter roofs. Z-purlins are recommended for longer spans and heavy-load roofs, especially in high wind zones.
Q3. What frame type is best for large clear-span buildings?
Portal frames or truss frames are suitable for large clear spans, offering strength and open floor space.
Q4. Are insulated panels necessary for all PEB buildings?
Not always. They are recommended for cold storage, food processing, or temperature-controlled facilities. For standard warehouses, single skin steel cladding may suffice.
Q5. How does Rostfrei ensure the quality of PEB components?
Rostfrei Steels uses high-grade steel, advanced cold-forming techniques, certified designs, FM approved and in-house manufacturing to ensure precision, Speed, strength, and durability.
