Since this texture would only be used on the first floor of building, I added a directional dirt gradient to help transition the texture into the ground.
In UE4, this texture was used for vertex painting. The ivy could be painted on top of any texture using a mask to control the opacity of the ivy.
Preview of what the ivy looks like over a brick texture.
These textures were created entirely in Substance Designer, rendered in Marmoset. I made the textures for a scene that I collaborated on with Clinton Crumpler. You can check out his portfolio here: https://www.artstation.com/ccrumpler