#Leaking rain ~ Request for investigation from real estate rental companies

Conducted a rain leak survey at the request of a real estate leasing agent
It was a four-story building with an S structure, but it was due to the deterioration of the caulk applied to the shrinkage joints on each floor.
Since ALC panels are made of fired concrete (alkaline), when they come into contact with acidic rain, they become neutralized and the panels become vulnerable.
In addition, even if there is no problem with the caulk at the joints of the panels, if it is light and hardened, it will not be able to perform well, and rainwater will seep in through the thin paint film and capillary cracks. I would like you to inspect the caulk during maintenance periods such as exterior wall painting.