Or maybe this should be things you DON’T find in roof spaces!
The fire separation wall between this house and it’s neighbour. Not as common as it once was, but still a regular defect we see.
This poses the risk of fire spreading between properties. Most mortgage lenders and insurance companies require that a firewall is constructed using brickwork, concrete block work or a half hour fire resistant board material.
As things stand there is also nothing to stop your neighbour nipping round whilst you are on holiday…….