In office buildings I think they're required - and possibly even in new constructions. But in flats, I've never seen one nor known anyone who has bought one. Back home in the USA and Canada there are big campaigns promoting their use and purchase, that's totally true. In stand-alone houses as we have them there, I can understand their necessity. In flats in the cities I don't think they're as necessary. Plus, houses in the USA are generally built of wood and flats in the cities are built of brick and steel so things don't get out of control so fast here.

By the way, your flat has a wood ceiling? That's pretty unusual, I'd say. Or do you live in a house/chalet?

Saludos, MadridMan