Further details and link to download: https://github.com/motionforge/Unreal...
In the Github download link the Unreal Engine Project contains a selection of Materials and Material Functions that can be used for most if not all surfaces.
I've been building this collection as I go along making and creating new materials so it will be further updated and improved.
The aim for this material set is not to create specific material types, such as sandstone or brick, but to create base templates that can be used to create any specific material.