Whereas the traditional warning sign in older UK buildings is for you to know about a problem with your roof by having your ceiling plaster collapse when you least expect it!
I wasn't joking - I've been in two top floor flats in the UK in older buildings (central Edinburgh) that had ceiling plaster collapse due to roof problems.
A lot of people spray foam in old attics as a set and forget insulation measure: https://www.stellrr.com/wp-content/uploads/2021/04/AAF45418-...