I decided to revisit my roof tile material in the hopes of improving its overall quality. Originally inspired by Japanese roof tiles and the following piece by Andrew Dixon:
https://www.artstation.com/artwork/V4qnZ

The material has been refactored in multiple places with additional controls added such as the option to select other tile styles, adjustments of moss, lichen and maple leaves to name a few. Overall, I feel the material has improved, but I will most certainly return to it in future to push it further.

Cheers to The Base Mesh Discord group and The DiNusty Empire for their most excellent help and feedback!