walls as well.
most houses have cavities going up and that's where the go up sometimes rats will go literally just on the outside of your pipes going up the house and then go into the roof part like i say these sort of things you can then proof against get them repaired the drains as well so you won't get rats coming in again long term.
so have a good look around and see. if you have any rubbish that you leave outside this can attract rats so any rubbish that you have or recycling on a regular make sure that it is sealed covered and all these little things help 