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" subgirts to 12" section up to 10
gauge. 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.
In this section you'll find sample calculations for determining wind and snow loads as well as C purlin and
C girt weight tables.
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
5.286
6.041
10" Cee
3.541
N/A
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.