C Purlin and C Girt Structural Steel

Wind, Snow, & Weight Tables

Flexospan provides standard, even-profile C purlins and C girts as well as custom profiles and punching patterns. We manufacture any component from 1/2" steel subgirts to 12" section up to 10 gauge.  Steel c-purlins and c-girts are also available with other depths and flange widths. Contact Flexospan for information on purlin and girt structural steel dimensions.

Cee Purlin and C Girt Structural Steel

Purlin Coatings:

  • Prime Painted

  • Galvanized

  • Stainless Steel

  • ZAMŽ


Roof purlins are used to support metal roofing panels.  Wall girts are used for the fastening of metal siding.  They are available in stainless steel or galvanized, and can be prime painted and/or coated in ZAM.

In this section you'll find sample calculations for determining wind and snow loads as well as
C purlin and C girt weight tables.

C AND Z SPAN LOAD TABLE Cee Purlin and C Girt Structural Steel 
  (Blank form to layout hole punching patterns)
Sample Calculations
Calculation Formula Example
Wind load (sizing girts)
Wind load (lbs/sq ft) x .75 x girt spacing (ft) x wind coefficient (typically 1.1) = Allowable load/linear foot of girt


20 psf x .75 x 5 Ft x 1.1 = 82.5 plf

Live (snow) Load
(load on purlin)
Snow load (lbs/sq ft) x purlin spacing (ft) = allowable load/linear foot of purlin 20 psf x 5 ft = 100 plf
Note: These sample calculations are basic. Many different variables can affect loading. For example, drift loading, building height, geographic location, etc. Please contact Flexospan if special conditions exist.
C Purlin and C Girt Weight Table: Weight per Linear Foot
  16 Gauge

14 Gauge

12 Gauge

Size (nom)

2 1/2" Fl 3 1/2" Fl 2 1/2" Fl 3 1/2" Fl 2 1/2" Fl 3 1/2" Fl
6" Cee 2.656 N/A 3.281 N/A 4.531 N/A
8 " Cee 3.099 3.541 3.828 4.375


10" Cee 3.541 3.984 4.375 4.922 6.041 6.797
12 " Cee 3.984 N/A 4.922 5.468 6.797 7.552
Note: These weights are for three or more spans based on uniform bay spacings. Contact Flexospan for help on calculating weights for non-uniform bays.