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How to Calculate and Place Screws

Allsteel carries screws in 2 different lengths: 1½ inch and 2 inch. The 1½ inch variety is the best all-purpose size. The table below can be used to figure approximate quantities of screws for various purlin spacings and sizes of roofs. Screws are available in quantities of 250.

SCREW (purlin) SPACING

linear ft of panels
in your order                        12 inch        18 inch        24 inch
50                                          270              180             135
100                                        540              360             270
200                                        1080            720             540
300                                        1620            1080           810
400                                        2160            1440           1080
500                                        2700            1800           1350
600                                        3240            2160           1620
700                                        3780            2520           1890
800                                        4320            2880           2160
900                                        4860            3240           2430
1000                                      5400            3600           2700
1100                                      5940            3960            2970
1200                                      6480            4320            3240 


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Again, be sure to clean away any metal shavings left after applying screws to the panels to prevent rust stains.

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