Does the sunken duplex with underground garage need waterproofing?
Need to be waterproof inside the underground garage. Generally, underground garages have external waterproofing, but the general external waterproofing is SBS coiled material. Backfilling in the later stage is easy to cause the waterproof layer to fall off or be damaged, and there is a great possibility of leakage in the later stage. So you'd better waterproof the underground garage later. The treatment method is very simple, as long as YYH waterproof slurry is directly sprayed in the basement of underground garage.