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
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(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