Cobrachicken , 5 days ago " 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
" 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