This is why I use 0.00001 for zero thickness on sub assembly

[Joe-Bouza]

[tcorey]

Yes, there are places where Civil 3D does not allow 0 thicknesses. Maybe someday...

[sboon]

There are a fair number of places where you cannot use a 0 width either, even though it would be appropriate for some designs.

Steve
Please use the Accept as Solution or Kudo buttons when appropriate

[fcernst]

What are you trying to do here Joe? What are your subassembly settings?

Here's mine:

[Joe-Bouza]

Hie Fred
Nothing special. In this particular case I wanted to overlay only from the curb so I only wanted a top "layer" in the widen strip because I wanted to see the difference between a set thickness and the projected overlay (you may have noticed it does not mill) But what I am doing isn't at issue. In an earlier post Peter mentioned that layers can be set to 0 if you didn't want them seen or modeled. I was only showing that, at least up to 2013 assemblies look odd when absolute zero is used.

[fcernst]

I still need to see your settings to be clear.

So are you saying if you have a top layer of some thickness greater than zero, with all other layers zero, it doesn't work?

[fcernst]

That subassembly appears to still have problems in 2014 also...

Here's how it looks in Layout and Section View for the settings I show below where I am just trying to create a 4" Pave 1 depth. It still creates the other Materials: