I installed a ribbed metal roof, myself, after studying online for about a year before retirement. I pre-measured the house, addition, separate bath, etc. for lengths. I believe I had around 15 different pre-cut lengths. I ordered through A&B Lumber in Moultonborough, where I live. Best price.
I installed over shingles and used few purlins, only as filler to get the right angle going from roof to porch.
These are the screw-in type of panels. The manufacturers say to screw through the flats, if using screws, or through the ribs, if using nails. Reasoning is for metal expansion/contraction due to heat in summer etc. I didn't agree, and used screws through the ribs and am happy with the results. This was in 2013. The screws are gasketed.
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