Let me tell you something first. Five years ago, my sister's family spent more than10.8 million to buy a commercial house in the city. It's a penthouse with a terrace on the roof. My sister is very happy because she is used to farming in the countryside. Now she thinks she will have a small vegetable garden in the city. I don't know where my sister got so much soil from the garden. On the roof, a platform of more than 20 square meters, almost 10 cm thick, was planted with cabbage, garlic and shallots. Needless to say, it was really beautiful.
Because I have done floor design before, I know something about waterproofing and floor bearing. When I visited the small vegetable garden during the Spring Festival, I told my sister that she must shovel the vegetables and send the soil wherever it came from. I said it's okay for you to plant some potted plants on it, but planting vegetables directly on the floor will have a great impact on the floor. After a few years, the floor will seep and the top of the room will be moldy and peeling. Sister said, my side dishes are so good and green. Don't you think the next-door neighbor does the same to the small vegetable garden? Finally, I repeatedly persuaded to add "scare", but my sister gave up what she wanted, canceled the small vegetable garden and only planted some potted flowers and plants.
After the epidemic this year, when I went to my sister's house again, I saw that the roof of my neighbor's house was waterproof. Well, why bother coming? ...
The acid and alkali substances in the soil layer will corrode the floor waterproof material, which will not have any effect for a year or two, but in the long run, it will definitely cause many leakage sources. Don't grow vegetables on the top floor of ordinary commercial housing, because small costs big!