Here is an example of using maps to model wooden walls, using the Slate Material Editor.
Building with default materials
Node for a single Standard material
Planks bitmap for the wall texture
A Bitmap node added to the active View
Dragging from the output socket of the Bitmap node creates a wire.
Dropping the wire on the Diffuse Color input socket applies that map to the material’s diffuse color component.
Texture applied to the walls, but not aligned properly
Texture map aligned to fit the geometry
Bitmap for adding bumps to the plank material
.
(This is simply the same image saved as black-and-white.)
Bump map added to the material tree
Building with both texture and bump maps applied to the walls
Use the Parameter Editor at the right of the window to increase the Bump amount.
Bump Amount increased to make the walls appear more weathered