I'm a real blender noob (maybe 4 hours of experience). I created model of a house with archimesh addon. Once I was happy with the layout, I joined all the rooms into one model using CTRL + J. I tried to texture the outside of the house but it does not have vertices, edges nor faces.
Here is image of the faces my model contains when rooms are joined:
I took a look at backup of the model where rooms are not yet joined and I noticed that rooms didn't have "backside" then either:
I want to see the edges of "outside" of the house (and each room) so I can mark seams to start texturing. Please help a noob.