I want to build a fish pond on the balcony, how to do it concretely waterproof

It is necessary to fully consider the load-bearing of the balcony, because the load-bearing of the balcony is generally not as large as that of the room.

There will be no safety problems if you find a good professional company to do it, and a height like this can be made into two floors, and the specific construction party will tell you how to do it. >>>More

Not good, the balcony is first of all an outlet to absorb anger, so change you to reduce such a valve. The second balcony is next to the bedroom or living room, and if you raise the pit by 25 cm, it will be higher than the bedroom or living room, and the water will moisten it, and the dirty smell from the toilet will flow into your room.

1. The main structure of all sun rooms should be made of square steel as the load-bearing main material. For small and medium-sized sun rooms, the basic columns around it are necessary, plus the beams and longitudinal beams on the top surface to support the color steel plate or tempered glass, and combine them into a network structure, so that the sun room material is very firm and safe. >>>More

After building the house, build another toilet outside the house, in the east, west, north and south directions.