Purlins are used mainly as a structural member to support roofing sheeting and are zinc coated, which affords a high level of corrosion protection and eliminates the need for painting. While steel purlins have traditionally been used in industrial buildings they have become more and more acceptable for residential applications, owing to their light weight and durability.
Special feature “Z” purlins are their ability to interlock and this eliminates the requirement for joining sleeves.
An emerging use of “C” purlins is its use as a structural member (beam or column) in steel framed construction.
Raw Material
Hot Dipped Zinc Coated (galvanized) Cold Rolled Steel Sheets
ASTM A 924 M Rev a. – 1997
ASTM A 653 M – 1997
Base Mechanical Properties
Yield Strength min. – 275 MPa
Tensile Strength – 380 MPa
Elongation in 50 mm – 16%
Bend Test Ratio of inside bend diameter to thickness – 2.5
Coating Mass – 275 g/m2 Triple Spot Both Sides
| PRODUCT | THICKNESS OF MATERIAL (mm) | WIDTH (inches) | WIDTH (mm) | NOMINAL MASS (kg/m) | |
| Z PURLINS | 1.5 | 6 | 152.4 | 3.401 | M2 |
| 1.5 | 7 | 177.8 | 3.7 | M3 | |
| 1.5 | 8 | 203.2 | 3.999 | M4 | |
| C PURLINS | 1.5 | 6 | 152.4 | 3.747 | M2 |
| 1.5 | 7 | 177.8 | 4.046 | M3 | |
| 1.5 | 8 | 203.2 | 4.345 | M4 |
