Roof

You can adjust the offset edge or offset height, and you can also overwrite the material. Additionally, pressing "Random Material" will replace the current material with a random one.

The roof is generated as a Dynamic Mesh, which can negatively impact performance. To address this, once you've finished editing the Building Blueprint, press "Bake Roof" to convert the Dynamic Mesh into a Static Mesh.

If you modify the shape of the building, the roof needs to be rebaked to match the updated shape.