Roofmaker is an overseas tool with different terminology to us. It doesn't do "Purlins" in our sense. (No in answer to your question) That is why we get all the Cadimage Tools free to bring Archicad up to something useable. If you intend to further your occupation after graduating, most employers in NZ will be using the Cadimage tools, so now is the best time to learn to use them.
Imac, Big Sur AC 20 NZ, AC 25 Solo UKI,