Walls displaying very light below roof

[vanderloo5]

I thought I remembered that correcting this issue could be done by adjusting the roof transparency but I have my roofs set to 100% transparent and my walls below plot barely visible.
Can someone remind me of the fix for this.
Thank You.

[PijPiwo]

Try to apply negative offsets to the Bottom and the View Depth (view range), so they are below the top of wall on the lower level.