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The roofing contributes to the building’s visual attraction, security, and protection. Longevity, durability, and longevity are crucial considerations when erecting a building. 

The purlins are provided by structural support for the buildings. The metal roofing sheets system of something like the roof/deck sheeting is supported by purlins, which are, in turn, supported by rafters. Purlins come in a variety of varieties due to their materials and shape. Steel purlins are the most frequently chosen. 

In this article, we are going to see a brief overview of purlin’s kinds and applications. Let’s begin by defining the term “C and Z purlins” in its most basic form. 

C Purlin

Walls and floors are supported by the C purlin. It has numerous uses, including those found in garages, commercial buildings, verandas and other construction that need strong and resilient steel framing. Additionally, it is utilised for roof cutting, door framing, and window trimming. Because of their consistent structure and simplicity of handling, C purlin manufacturers can be made longer. It offers reliable assistance and is simple to set up. 

The benefits of C purlins are listed below:

  • Side drilling/cutting is not required
  • Durable 

Z Purlin:

The wall junction and roof are supported by the Z purlins. Compared to C purlins, a Z purlin helps with overlapping and produces a more robust framework. Z purlins are employed in industrial designs because of their robustness. 

The benefits of Z purlins are listed below:

  • heightened intensity 
  • allows for overlap 
  • reduced use of materials 

Finishing In C and Z Purlins:

Lead oxide and galvanised are the two types of finishes available for purlins. Despite the lack of structural distinctions between the two finishing techniques, it is useful when choosing the location of the construction. 

Red oxide:

It is painted red after receiving a red paint primer to help protect it from rust and severe weather. If anyone is seeking an inexpensive weather moderator and colour alternatives, red oxides are the finest choice. 


The procedure involves coating the material with zinc to make it resistant to corrosion. This enables it to survive challenging circumstances like those found in the chemical industry, close to the coast, etc. Galvanised metals can be used for the following purposes. 

  • Long-lasting 
  • harsh weather zones near the coast or the sea without paint

Comparison of C and Z purlins:

  • Since Z purlin has a higher moment of inertia than C purlin, it is advised to utilise Z purlin for greater integrity. 
  • A Z purlin can also overlap multiple times, which helps you extend the span, unlike a C purlin, which cannot. 
  • Since Z purlin’s strength is great due to its overlapping design, roofing sheets need to have a high load capacity. 
  • The optimum purlin to use for single-span structure buildings is C.