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<br /> <br />Purlin spacing can be up to 30 inches for 29-gauge (2 feet is most common) and <br />up to 4 1/2 feet for 26-gauge roofing. <br />Screws should be placed on both sides of the ribs on the eave. <br /> <br />Screw Spacing (Purl in) 18inCh~Ch <br /> 12 inch 30 inch <br />I 50 270 180 13 108 <br />100 540 360 270 216 <br />I 200 1080 720 540 432 <br />300 1620 1080 810 648 <br />c 400 2160 1440 1080 864 <br />- <br />i 500 2700 1800 1350 1080 <br />I 600 3240 2160 1620 1296 <br /> ~._::;....,. <br />, 700 3780 2520 '1890 1512 <br />J 800 4320 2880 2160 1728 <br />900 4860 3240 2430 1944 <br />.. <br />I 1000 5400 3600 2700 2160 <br />::: 1100 5940 3960 2970 2376 <br /> 1200 6480 4320 3240 2592 <br />Policies <br /> <br />Indemnity: All prices and designs are subject to change without notice. <br /> <br />Disclaimer: Despite the fact that we have made every attempt at accuracy in this manual, we are <br />not responsible for typographic, printing, or technical errors. <br /> <br />NOTE: Diagram drawings are typical in this installation guide per product specifications or an <br />equivalent product <br />