Z purlins are a type of structural member primarily used in the construction of metal buildings and roofs. They play a crucial role in supporting the cladding (roof and wall panels) and transferring the load to the main structural frame.
Primary Uses of Z Purlins
Based on their design and strength, Z purlins have specific applications in construction. They are distinct from other types of purlins, like C purlins, due to their shape which resembles the letter 'Z'.
According to the reference provided:
- Z purlins are typically used at joints and overlaps.
- They are essential for giving structure to the roof and wall joists.
This usage at joints and overlaps leverages their unique interlocking shape, which the reference notes makes them somewhat stronger than C purlins.
Why Use Z Purlins?
The Z shape offers advantages that make them suitable for these specific applications:
- Overlapping Capability: Unlike C purlins, Z purlins can be overlapped at supports. This overlap creates a continuous beam effect, which helps distribute loads more effectively and can result in a stronger, more rigid structure, especially over multiple spans.
- Strength: Their design contributes to their strength, making them ideal for supporting the weight of roofing materials, insulation, and potential snow or wind loads, particularly where sections join.
- Structural Support: By attaching to the main rafters or girts (wall supports), Z purlins provide the necessary framework for attaching roof and wall cladding, ensuring these surfaces are securely fastened and properly aligned.
In summary, Z purlins are key structural components in pre-engineered metal buildings, specifically chosen for their strength and ability to overlap, providing critical support and structure at the joints and along the roof and wall joists.
