Purlin for building materials

Cold-formed steel roof purlins and side rails are manufactured from pre-galvanised steel strip, in the form of coils, which have been slit to the desired width from the parent or "wide coil" supplied from the mills.

The purlin is formed gradually by feeding the strip continuously through successive pairs of rolls, which act as male and female dies. Each pair of rolls progressively forms the strip until the finished profile is produced.

In building uses, the most common and simplest of profiles are the lipped Z and C sections - both defined by a central vertical web joined to horizontal flanges at either end. Additional lips are included because unstiffened, wide, thin plates are unable to resist significant compression and the flanges become inefficient.

Z/C sections are usually installed with the top flange pointing up the roof slope so that the load is applied through the shear centre and serious twisting of the sections does not occur.

Model        Size(mm)          Sectional area   Theoretical weight

             H      B        A             T       CM2           KG/M

C80       80     40      15      1.7-3.0       3.64          2.86

C100     100    50      15     1.7-3.0       5.5           4.32

C120     120    50      20     1.7-3.0       6.25         4.91

C140     140    60      20     1.7-3.0       8.64          6.78

C160     160    70      20     1.7-3.0       9.84         7.72

C180     180    70      20     1.7-3.0       10.44        8.20

C200     200    70      20     1.7-3.0       11.04        8.67

C250     250    70      20     1.7-3.0        12.05       9.20

Note:If customized Zee purlins size is required,please don't be hesitated to contact with us and let us know the size details.Our production team will check and see if we could meet your demand on the special size.