Threshold of run door(interior)Many of the photo's here were taken during the building phase .Many of the "holes" have since been "patched" and hardware cloth secured properly with steel lath strips or strips of wood and screws or fence staples
An hour before dark everyday I put my chickens back in their run , shut the door and lock it.
If for any reason I forget to shut their pop up door after dark my chickens are still safe.
This is a good habit to get get into.