That's hilarious. Have they checked there's not something in the environment turning people mad? Is it even common for terraced houses to share roof space without a dividing wall??
They tend to be built in 4s, with a covered alleyway between the two middle ones (a "gennel" in local parlance), the roof ends have supporting walls of course, the middle ones sometimes have brick, sometimes just wood and a panel-wall to support the (always slate) roof proper.
As to madness, almost certainly, they're all barking (in an agreeable way).
As to madness, almost certainly, they're all barking (in an agreeable way).