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Best way to detect Floors and Walls


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My application loads a scene (basically a 3d apartment) from a url. It has to automatically identify the floors and walls in that scene.

I am trying to identify floorMeshes to enable teleport.

I need to identify walls also from a given scene to let the user change its texture.


I explored logic like, getting the sizes of each mesh and calculate its dimensions. If the position.z is 0 and its height is 0 then it is floor. If the height is >0 and thickness is 0 then it is a wall. 


Is there any much reliable way? 


Thanks in advance.


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