I couldn’t get a tile material I liked just using the shader editor, so I used Substance Designer with this tutorial https://www.youtube.com/watch?v=15zFJoZ5NzI
and this as a reference
https://www.spab.org.uk/sites/default/files/images/MainSociety/News/SPAB-blog-roof%20tiles-OHP-c%20Ralph%20Hodgson.jpg
complete with bird poop 
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