Water supply and drainage pipes that pass through the outer wall are generally required to be rigid waterproof casings (flexible waterproof casings for water tanks and pools). At this time, the diameter of the pipe is the same as that of the pipeline. Refer to the diagram for practice.
The water supply and drainage pipes that pass through the floor and the inner wall are made of steel or iron sleeves, two sizes larger
For example, the pipe of DN100, the casing pipe is DN150
Among them, the kitchen and bathroom drain pipes are not sleeved when they pass through the floor slab.
When the pipe passes through the wall and floor and is installed with metal casing (outer wall) or plastic casing, the top of the casing installed in the floor should be 20 mm higher than the decorative floor, and the top of the casing installed in the bathroom and kitchen should be high 50 mm out of the decorative floor, and the bottom of the casing should be level with the bottom surface of the floor; the two ends of the casing installed in the wall are level with the decorative surface, and the gap between the casing and the pipe that passes through the floor should be flame-retardant dense material and The waterproof ointment is filled and the end surface is smooth; the gap between the wall bushing and the pipe should be filled with a flame-retardant dense material and the end surface should be smooth. The joint of the pipe should not be set in the casing.
