Unfortunately, you cannot assign a Model Pattern to a Wall Layer, so the pattern will scale with the scale of the View so that it always plots at the same size (rather than maintaining a fixed "model" dimension and plotting larger or smaller based on the view scale).
It may be easier to get the fill pattern right for one, commonly used scale, and then using filled regions in views of other scales. Unless someone else has a more clever suggestion for getting different fill patterns to be used for different view scales. (I did not see a way to change the pattern assigned to a material based on whether the View was set to Medium or Fine. (Coarse can be different, as that is not set in the material for the layer, but for the overall Wall width. But you may not want the entire Wall width in Coarse views getting the insulation pattern.)
David Koch
AutoCAD Architecture and Revit User
Blog | LinkedIn
