Water Pipe Replacement in Prefabricated Slab Houses

The replacement of water pipes in prefabricated slab houses requires comprehensive planning based on the house's condition and renovation needs. In the case of dilapidated house renovations, a complete pipeline update is usually necessary, while for ordinary house renovations, careful construction is required to avoid structural damage.

I. Water Pipe Replacement in Dilapidated House Renovations

If a prefabricated slab house is identified as Class C (partially dilapidated) or Class D (completely dilapidated), it needs to be demolished and rebuilt or undergo expropriation and renovation according to policies. In such projects, water pipe replacement is a core part of pipeline updates and is usually carried out simultaneously with the renovation of electrical wires and gas pipelines.

• Class C Dilapidated Houses: The partially damaged areas need to be reinforced, and aging water pipes should be replaced to prevent secondary structural damage caused by pipe ruptures. For example, water pipes in water-intensive areas such as kitchens and bathrooms should be replaced on a priority basis, and the integrity of the waterproof layer at the joints of the prefabricated slabs should be checked.
• Class D Dilapidated Houses: A complete demolition and reconstruction are required. In this case, water pipe replacement should be incorporated into the pipeline design of the new house. It is recommended to use new materials such as PPR pipes, which have better corrosion resistance and anti-aging properties than traditional galvanized pipes and offer more reliable connection methods, reducing the risk of water leakage in the later stages.

II. Water Pipe Replacement in Non-Dilapidated House Renovations

If a prefabricated slab house is not identified as a dilapidated house but requires partial water pipe replacement (e.g., due to leaks in old pipes), the following points should be noted:

• Structural Protection: Since prefabricated slabs are prefabricated components, slotting or drilling may damage their internal steel bars or structural integrity. Before construction, methods such as infrared thermal imaging and tapping detection should be used to locate the original pipeline routes and avoid accidentally cutting load-bearing structures.
• Material Selection: Flexible pipes such as PPR pipes should be preferred, as their flexibility reduces the need for cutting the prefabricated slabs. If metal pipes must be used, they should be fixed with clamps to avoid direct welding, which generates high temperatures and may cause the prefabricated slabs to crack.
• Waterproofing: When replacing water pipes in bathrooms and kitchens, waterproof coatings should be reapplied, and water stop rings should be installed at the points where the pipes pass through the floor slabs to prevent water from seeping into the gaps of the prefabricated slabs, which could cause mildew or structural corrosion.

III. Suggestions for Simultaneous Renovations

If the house also requires electrical wire replacement, it is recommended to carry out the water pipe and electrical wire renovations simultaneously to reduce the damage to the prefabricated slabs caused by repeated construction. For example, when slotting the walls, the routes for both water and electrical pipelines can be planned simultaneously, following the principle of "water pipes running along the ceiling and electrical wires running along the floor" to reduce the difficulty of later maintenance.