Scaling UV's
 

I am having a heck of a time scaling my UV's. I have a building with a a couple different size walls. I planar map each wall and play around with the scale. The problem is that the texture I am using is bricks, so I am trying to get the scales exact. I have looked around the forums here ... I fear I am missing the point.

aha !

Projection Height and Projection Width seems to work ,,,