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Summary of Three Different Methods for blocking Pipes through walls

2025/10/10

Methods for Sealing the casing of Water Pipes in tube Wells
Standard key points
1. The specification of the casing should be two grades larger than the diameter of the pipe.
2. The top of the sleeve installed in the floor slab is 20mm above the ground. When installed in bathrooms and kitchens, it should be 50mm above the ground and the bottom should be flush with the bottom surface of the floor slab. The two ends of the sleeve installed in the wall are flush with the decorative surface.

3. The gaps between the sleeves passing through the floor slabs and the pipes are filled with flame-retardant and dense materials and waterproof grease, with smooth end faces. The gap between the through-wall sleeve and the pipe is filled with flame-retardant and dense materials, and the end face is smooth.
4. The casing and the passing pipe should be concentric.

5. The part of the casing that protrudes above the ground can be made of concrete as a water-retaining pier.
Before installing pipes in the pipe well, the ceiling and wall decoration and renovation works must be completed to avoid the situation where the wall decoration and renovation works cannot be carried out after the pipe installation is completed.

Methods for Blocking Air Ducts through Walls
1. Air duct sleeve: When air ducts pass through fireproof or explosion-proof walls or floors that need to be enclosed, 1.6mm thick embedded pipes or sleeves should be installed.

2. Flexible fireproof materials should be filled in the areas where air ducts pass through walls and floor slabs.
3. Before installing pipes in the pipe well, the decoration and renovation of the top plate and walls must be completed.
Fireproof Sealing Methods for Cable Trays in Pipe shafts
1. When cable trays pass through fire compartments, fireproof sealing should be carried out.
2. The cable tray should not be connected in the floor slab, and the cover plate should be staggered from the floor slab by 200-300mm to facilitate fireproof sealing. When crossing the floor slab simultaneously, a waterproof platform should be added around for protection, with a height of no less than 50mm.

3. When cable trays, bus ducts, etc. pass through the walls and floor slabs of transformer and distribution rooms, elevator machine rooms, boiler rooms and fire compartments, they should be sealed with fireproof materials such as fireproof mud or fireproof blocks (fireproof pillows), and the sealing should be tight and flat. For fireproof sealing in vertical trunking, fireproof blocks can be placed on the reinforcing bars. When using fireproof blocks, they should be flush with the wall. When using fireproof mortar, they can slightly protrude from the wall and be smoothed and square-shaped. Alternatively, after sealing with fireproof materials, they can be tightly sealed with fireproof boards.
4. Before installing pipes in the pipe well, the ceiling and wall decoration and renovation works must be completed to avoid the situation where the wall decoration and renovation works cannot be carried out after the pipe installation is completed.