I am checking a design of some cold formed Steel Z shape purlins. I haven't worked with this material before. I have the 1996 cold formed steel design manual put out by AISI and am learning with the examples. I have gotten through the effective section properties example I-10. There is one value that I cannot find where or how to calculate....In the table where the moment of inertia is determined they find a y distance from the extreme fiber of the section ...the last 2 distances .202 (to the top lip) and 7.649(to the bottom lip) have worked for hours and I can't seem to get these numbers...If anyone has had this problem or can help me out I would appreciate any help
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