How old were you back then? These kids awake to a world fucked up by the older generation. They try to take every step that comes to their mind to steer away from desaster. What is your personal input in that task? Criticism. Well done. Go out and teach them, if you’re so clever.
" The material is not the root cause, rather inadequate roof maintenance, which permits water infiltration, and decisions by building owners as to repair or the replacement of existing roofs, which is a part of cost-benefit analysis."
quote from:
https://en.wikipedia.org/wiki/Autoclaved_aerated_concrete#Reinforced_autoclaved_aerated_concrete