Renovation of Water, Electricity, and Heating in Prefabricated Slab Houses

When renovating water, electricity, and heating in prefabricated slab houses, it is necessary to carry out standardized operations from two aspects: water and electricity renovation and heating installation to ensure safety and functionality.

Key Points of Water and Electricity Renovation

1. Strictly Prohibit Horizontal Trenching
   Prefabricated slabs are prefabricated concrete components with fixed internal steel bar distributions. Horizontal trenching can cut through the steel bar structure, reducing the load-bearing capacity of the floor slab and even causing fracture risks, threatening the safety of residents on the upper floors. If wiring is required, vertical trenching along the wall base or routing from the ground should be adopted to avoid directly damaging the main structure of the prefabricated slab.

2. Standardized Lamp Wire Layout
   Lamp wires can be laid along the wall corners or the ground to minimize interference with the prefabricated slab. If passing through the slab is necessary, a dedicated hole puncher should be used for precise positioning to avoid enlarging the hole diameter or repeated drilling. For renovation of old houses' water and electricity systems, it is essential to plan concealed works in advance, including wire routing, socket positions, and future electrical appliance expansion needs, to ensure construction quality meets modern living standards.

Heating Installation Solutions

1. Wet Floor Heating

   • Load-Bearing and Waterproofing: The load-bearing limit of a prefabricated slab is approximately 200 kg/m². When laying a pea gravel concrete backfill layer, the material thickness should be strictly controlled (recommended not to exceed 5 cm), and water usage should be minimized to reduce the risk of water leakage. Before construction, it is necessary to communicate repair plans with residents on the lower floors to avoid disputes.
   • Insulation and Pipe Layout Design: To address the poor insulation performance of prefabricated slab houses, it is recommended to use 3 cm crystal extruded polystyrene boards to enhance thermal insulation. The heat load should be calculated at 140 W/m². For balcony and window-adjacent areas, the pipe spacing should be 15 cm, and for other areas, 20 cm. Each circuit length should not exceed 90 meters to ensure uniform heating.

2. Dry Floor Heating

   • Lightweight Advantage: Using mushroom boards to fix the floor heating pipes eliminates the need for concrete backfilling, with a thickness of only 2.5-3 cm, significantly reducing the load on the floor slab while avoiding water leakage risks.
   • Installation Precautions: Before construction, the ground flatness should be checked (error ≤ 5 mm/2 m) to avoid floor noise later. Furniture should be evenly distributed to prevent excessive local pressure from deforming the floor heating modules. The heat load calculation and pipe spacing requirements are the same as those for wet floor heating.

Summary: When renovating prefabricated slab houses, priority should be given to ensuring structural safety. Water and electricity renovation should avoid horizontal damage, and heating installation should choose wet or dry floor heating based on the house conditions, strictly following load-bearing, insulation, and construction specifications. Before renovation, it is recommended to consult a professional institution for structural assessment to ensure the feasibility of the plan.