It has nothing to do with construction and everything to do with rainfall.
I can throw a lit road flare into my back yard and nothing will happen, because I don't live in a glorified desert. PR is an order of magnitude wetter than where I live.
PR has a dry season when the island receives less rain, and there are dry regions that generally get less rain. In fact, there are sometimes forest fires [1].
Regarding construction, I've never seen a smoke alarm inside a residential building in PR. I would hazard a guess that this is allowed for concrete/cinderblock; presumably the roof thing is the same.
PR has a dry season when the island receives less rain, and there are dry regions that generally get less rain. In fact, there are sometimes forest fires [1].
Regarding construction, I've never seen a smoke alarm inside a residential building in PR. I would hazard a guess that this is allowed for concrete/cinderblock; presumably the roof thing is the same.
[1] - https://www.elnuevodia.com/noticias/seguridad/notas/incendio...