Roofing & Corrugated Sheets, Cebu
C-Purlins
C-purlins are cold-formed steel sections shaped like the letter C. They run horizontally across the roof frame, spanning between trusses or rafters, and the roofing sheets fix directly to them. The shape gives good stiffness for the weight, which is why it is the standard purlin section.
Specification
Sizes and variants
Black iron (BI) C-purlins
Uncoated, normally painted on site. The usual choice under a covered roof.
2 x 3 and larger sections, in thicknesses from 0.8mm upward
Galvanized (GI) C-purlins
Zinc-coated, for exposed conditions or where longer service life matters.
Same sections, in thicknesses from 0.8mm upward
- Profile
- Cold-formed C-section
- Finish
- Black iron (BI) or galvanized (GI)
- Supplied
- In bundles
Availability varies by size. Other sizes can often be sourced on request.
Checking a price?
Steel prices move with the market, so published figures date quickly. Send a list of sizes, grades, and quantities for a current quotation.
Applications
Where it is used
- Roof framing, spanning between trusses
- Wall girts
- Light structural framing
Questions
About c-purlins
What thickness of C-purlin do I need?
It depends on the span between supports and the load the roof carries, including wind uplift. Longer spans and heavier loads need thicker sections. This is set by the structural design rather than chosen on site.
Should I use black iron or galvanized?
Galvanized resists corrosion better and is worth it where the purlins are exposed, near the coast, or in a building that is hard to maintain later. Black iron is normally painted and is common where the roof space is enclosed and dry.
How far apart do purlins go?
The spacing depends on the roofing profile and gauge as well as the design loads, since the sheet has to span between purlins without deflecting. The roofing manufacturer's span tables and your structural design govern it.
Looking for other sizes or grades? See the full Roofing & Corrugated Sheets range.
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