Layer function priorities error

[haydenwse]

I am trying to build a floor family that has conc, insulation, sand, vapor barrier, gravel.  (see attached)

when I edit it as shown I get a "layer function priorities" error.  What am I doing wrong? 

[ccollins · Accepted solution]

The Core Boundaries need to move.

see attached.

[h.emerson1]

thanks a lot, basically just had to move the boundary layers