Answer:
(1) According to the waterproofing standards of JASS 8 of the Japan National Association of Architects, it is recommended to use a water-based and solidifying composite waterproofing material (commonly known as "elastic cement").
(ii) The waterproofing of bathrooms and toilets has the following key points that must be paid special attention to or reinforced in advance:
(1) Around the drainage pipes.
(2) Around the barrier stop-water stone.
(3) All floor corners.
(4) Areas of water accumulation at the bottom of the bathroom and toilet.
(5) Pipe relocation, new and old slot holes, and water pipe configurations.
(6) The bathroom floor is paved with granite stone (since the cement mortar of the stone is mostly applied with a soft base, the waterproof layer is easily damaged under years of accumulated water).
(7) The areas where the light partition panel’s wall meets the non-structural component of the RC wall.
(8) The area of the bathroom door frame facade.