How to Renovate the Second Floor of a Prefabricated House

Renovating the second floor of a prefabricated house requires a comprehensive approach involving reinforcement, renovation, functional optimization, and attention to detail, as outlined below:

Reinforcing Load-Bearing Capacity

Old prefabricated panel houses have limited load-bearing capacity and must be reinforced as a whole before renovation. Floor reinforcement is a core aspect: If the prefabricated panels have been in use for over 30 years or emit creaking sounds when stepped on, they need to be reinforced with a 'steel belt' (i.e., installing steel strips along the edges of the panels) or by adding cross-shaped steel beams or concrete beams beneath them. Additionally, a composite reinforcement layer of steel wire mesh and concrete can be laid on the floor surface to ensure a load-bearing capacity of at least 150 kilograms per square meter (high-quality structures can reach 500 kilograms). Wall and structural reinforcement are equally crucial: Load-bearing components such as beams and columns must be inspected, and if necessary, reinforced by adding structural columns, ring beams, or using carbon fiber cloth to enhance overall stability.

Water and Electrical Circuit Renovation

Old water and electrical circuit layouts often pose safety hazards and cannot meet modern demands. Before renovation, it is essential to obtain the original architectural drawings as much as possible to clarify the locations of pipelines and avoid damaging the structure during construction. For water pipes: Check for rust and corrosion, replace aging faucets and valves, and prioritize the use of corrosion-resistant materials such as PPR. For electrical circuits: Replace aluminum wires with copper wires with a cross-sectional area of no less than 4 square millimeters, and increase the number of outlets (especially in high-power areas like kitchens and bathrooms) to ensure reasonable circuit branching and avoid overloading.

Thermal Insulation and Heat Insulation Engineering

Prefabricated panel houses commonly suffer from cold winters and hot summers. Wall insulation can be achieved by applying thermal insulation coatings or installing materials such as polystyrene boards or rock wool boards. Roof heat insulation (for top-floor houses) requires laying extruded polystyrene boards or reflective heat insulation films on the roof surface to reduce heat transfer. If the budget allows, consider adding a pitched roof or planting a green layer on the roof to further enhance heat insulation effects.

Sound Insulation Optimization

Poor sound insulation in old houses can be improved in the following ways: Windows can be replaced with insulated glass or vacuum glass and fitted with sealing strips; walls can be enhanced with sound insulation felt or acoustic cotton, especially in bedrooms and studies; floors can be further soundproofed by laying shock-absorbing pads or sound insulation mortar on the ground.

Floor Material Selection

Floor materials must balance load-bearing capacity and practicality: Tiles must meet precise calculations of the floor's load-bearing capacity, professional treatment of panel joints (cleaning debris → filling with C30 fine aggregate concrete → hanging steel wire mesh → applying interface agent), and control of the cement mortar layer thickness between 40-50mm (with a bonding layer of no less than 20mm). Wooden floors must be waterproofed to prevent moisture-induced deformation, and it is recommended to use laminate flooring or engineered wood flooring.

Other Details

• Ventilation after renovation: Allow the house to ventilate for at least half a year after renovation to prevent moisture from causing tile hollows.
• Base layer treatment: If the ground is too smooth, roughen it to enhance adhesion.
• Water and electrical channeling: Ensure that the depth does not exceed one-third of the wall thickness to avoid damaging the structure.
• Crack repair: Thoroughly repair cracks in walls and floors before construction to prevent further expansion later.