I had a look, one of the brick surfaces (not the CMU) use the procedural brick shader for white bricks on all relevant channels.
If you go in to the Brick shader settings, look for a 'Shift' parameter, change it from 50 to 0 and you will get stacked bricks. Change this in all channels that use the brick shader.
Erwin Edel, Project Lead, Leloup Architecten
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