NavMesh creates navigatable terrain under obstacles

My NavMesh is baking some areas that it should not, the obstacles I place on my the terrain are not completely removing the navmesh underneath them.


The room is this. The units should not go underneath the path.



Here it is again with the NavMesh. The NavMesh is creating areas to walk on underneath the obstacles I'm placing on top of the terrain.




How to remove the baking of the areas beneaths the paths that are intersecting with the ground?

 

Did you try and add a

NavmeshModifier

to your obstacles you want to block and set the correct layer settings?

 

In that case I'd have to use the extended package of NavMesh. From what I understood, that means adding the NavMeshSurface component everywhere, that's fine and I might go down that path eventually. But I'm starting to wonder if Unity's NavMesh system is the way for my game.
Mhh... I'll hold off on fixing that detail and figure if NavMesh is really what I want to use. Thanks for the suggestion though.