Carries sheeting between frames
C purlins span from frame to frame and carry the roof sheeting or wall cladding fixed to their flanges.
Purlins & Sag Rods
C Purlin
C Purlin is a lipped C section roll-formed from steel strip, used as a roof purlin, a wall girt or side rail, and for framing openings in steel buildings. The lips stiffen the flanges, and the section is fixed to cleats on the main frames. Specify depth, flange, thickness, steel grade, finish and the quantity you need.
At a glance
C Purlin at a glance.
Lipped C, single spans and openings
C sections do not nest into each other, so they suit single spans, eaves, gable ends and the framing around doors and windows.
3 to 14 in deep, 10G to 16G
3–14 in (75–300 mm) deep, 2.35–3 in (60–75 mm) flanges, 3/4 in (20 mm) lips, 10G–16G (1.5–3.15 mm), in ASTM A653 / A1011, S350GD / S450GD, G450–G550 to AS 1397 or IS 2062, plain, galvanized (G90 / Z275 / Z350) or red oxide primed.
Also known as
C Purlins are C girts when used in walls in the US, C section purlins in the UK and C sections in Australia; in other languages they are panne C (French), C-Pfette (German) and profilo a C (Italian).
- English
- United States
- UK & Ireland
- Australia & NZ
- Français
- Deutsch
- Italiano
Bolted to cleats on the frames
Cleats welded or bolted to the rafters or columns carry the purlin, which is bolted to them through holes punched in its web. The sheeting is screwed to the top flange. Sag rods between the purlins keep them straight and upright while the sheeting goes on.
Common applications
Where it is used.
Roof purlins on single spans
Warehouses, workshops and farm buildings use C purlins where each purlin spans one bay. They also make the eaves member.
Wall girts and side rails
Turned on its side, the same section carries the wall cladding across the columns. US buyers call it a C girt.
Openings and light framing
Door and window openings, mezzanine edges and small frames are built from C sections. Back-to-back pairs make heavier members.
Questions answered
Common questions.
What is a C purlin called in other markets?
US suppliers call a C section used in walls a C girt; UK suppliers list C section purlins and Australian roll-formers C sections. In other languages it is a panne C in French, a C-Pfette in German and a profilo a C or arcarecci in Italian.
What sizes of C purlin does Corona make?
C purlins 3 to 14 in (75 to 300 mm) deep with 2.35 to 3 in (60 to 75 mm) flanges and 3/4 in (20 mm) lips, in 10G to 16G (1.5 to 3.15 mm) steel. They come plain, galvanized to G90, Z275 or Z350, or red oxide primed, in the grade the design names.
Part of the roof and wall systems
C Purlin carries sheeting on single spans and frames the openings, alongside Z Purlin for lapped runs and Sag Rods between the lines.
Explore cold-formed systemsC Purlin specifications
C Purlin configuration
ParameterUS / PrimaryMetric / Additional
Height (H)3-14 in75-300 mm
Flange (B)2.35-3 in60-75 mm
Lip (C)3/4 in20 mm
Thickness (T)10G-16G1.5-3.15 mm
SteelASTM A653 / A1011, S350GD / S450GD, G450-G550 to AS 1397, IS 2062 or equivalentASTM A653 / A1011, S350GD / S450GD, G450-G550 to AS 1397, IS 2062 or equivalent
FinishPlain, galvanized (G90 / Z275 / Z350), red oxide primerPlain, galvanized (G90 / Z275 / Z350), red oxide primer
Cold-Formed Profiles & Sections
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Height (H): 4-14 in / 100-350 mm · Flange (B): 2.75-3 in / 60-90 mm
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Diameter: 1/2, 5/8 in / 12, 16 mm · Length: 3-10 ft / 900 mm-3 m
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