Control R doesn't Loop cut and slide all the way around object


I am working on a tutorial for building a house and when I press Control R to get the Loop around the house it shows the loop around only one half of the house.

I cannot get the loop to go around the whole building.

I have uploaded my blend file for the house.

Please let me know what I’m doing wrong?



HousePlanV2.0.blend (484 KB)

There are several internal walls that need to be removed. I’ve hidden a face and highlighted one of them.