steel c purlin sizes chart infoupdateorg provides engineers and builders with current, clearly organized dimension tables for cold-formed steel framing. This reference focuses on standard C purlins used in commercial and light industrial roofs and walls, helping users select profiles that match span, load, and spacing requirements.
The summary table below highlights common nominal depths, typical web heights, and recommended maximum spans for light loading conditions, enabling quick comparison during early design stages.
| Nominal Size (C x Depth) | Web Height (mm) | Typical Thickness (mm) | Max Span (m) @ 400 OC |
|---|---|---|---|
| C100x45 | 100 | 1.6 | 3.0 |
| C150x65 | 150 | 2.0 | 4.2 | .gtr>
| C200x80 | 200 | 2.0 | 5.5 |
| C250x90 | 250 | 2.2 | 6.8 |
Material Grades and Coating Standards for steel c purlin sizes chart infoupdateorg
Material specifications strongly influence performance, especially in regions with high snow or wind loads. The steel c purlin sizes chart infoupdateorg often references G550 or G500 grade galvanised steel, which provides the necessary tensile strength and corrosion resistance for long service life.
Standard coating thickness for pre-painted galvanised steel purlins is Z275 or AZ150, measured in grams per square metre. These values dictate the expected corrosion protection and are critical when designing for coastal or industrial environments where exposure is more aggressive.
Design Codes and Load Cases Covered
Designers typically check steel c purlin sizes chart infoupdateorg data against relevant national design codes, such as AS 4100 for Australia or Eurocode 3 for European projects. Each code governs allowable stresses, deflection limits, and safety factors that must be applied to the selected profile.
Load cases commonly considered include permanent roof and wall loads, live snow and maintenance loads, and wind uplift on cladding. The chart usually presents span tables based on standard load combinations, enabling engineers to quickly verify capacity under serviceability and ultimate limit states.
Spacing Effects and Installation Practices
Center-to-center spacing has a direct impact on allowable spans and the distribution of bending moments along the web. Closer spacing reduces bending stresses but increases material usage, while wider spacing optimizes materials but requires careful checks against local buckling and deflection.
Proper installation practices, such as ensuring adequate lateral restraint at the compressive flange and using appropriate fastener patterns, help maintain geometric stability. The steel c purlin sizes chart infoupdateorg often includes notes on minimum edge distances and recommended fixing schedules to support safe field application.
Key Recommendations for steel c purlin sizes chart infoupdateorg Selection
- Confirm the required depth based on span and allowed deflection ratios, typically L/200 for roofs.
- Select material grade and coating thickness to match environmental exposure and local design codes.
- Verify spacing effects on bending moments and adjust profiles to avoid overstressing the section.
- Check site-specific obstructions, such as doors or equipment, that constrain web height or mounting details.
FAQ
Reader questions
What depth should I choose for a 6 meter roof with moderate snow load?
For a 6 meter span under moderate snow, a C200x80 or C250x90 is commonly selected, depending on spacing and additional loads, as these profiles offer sufficient depth to control deflection while maintaining经济性.
Can I use C150x65 for a bay with 7 meters clearspan?
C150x65 typically suits spans up to about 4.5 meters under normal loading, so it would require additional verification or reinforcement for a 7 meter span, often leading to a deeper profile to avoid excessive sag.
How does web height relate to rolling door clearance in warehouse buildings?
When purlins run parallel to rolling door tracks, the web height plus cladding thickness should fit within the available vertical clearance, commonly dictating a limit around 150 to 200 mm for standard sectional doors.
Are there different thickness options available for coastal projects?
Yes, for coastal areas the steel c purlin sizes chart infoupdateorg usually recommends increased thickness or higher coating mass, such as AZ150 or thicker galvanisation, to mitigate corrosion from salt exposure.