How to Renovate a Prefabricated Floor Slab House

The renovation of a prefabricated floor slab house should combine structural reinforcement with functional upgrades, as detailed below:

I. Structural Safety Assessment and Reinforcement

1. Comprehensive Inspection: Before renovation, commission a professional agency to conduct a structural safety assessment, focusing on the width of cracks in the prefabricated slabs (special treatment is required for cracks exceeding 0.3 millimeters) and the connection status between the slabs and the ring beams (bolts with a rust rate exceeding 30% need to be replaced).
2. Slab Joint Treatment: Remove the original filling material, implant No. 6 threaded steel bars, and pour C30 fine aggregate concrete to enhance the crack resistance of the slab joints.
3. Addition of Structural Columns: Add 240×240-millimeter structural columns at the four corners of the house, using No. 6 and No. 8 steel bars for reinforcement, and connect them reliably to the floor slabs to improve overall stability.
4. Temporary Support System: Before construction, install steel pipe supports every 1.2 meters along the length of the prefabricated slabs, and use H-shaped steel beams with a cross-section of ≥200×200 millimeters for underpinning at key nodes to prevent floor slab collapse during demolition.

II. Renovation of Key Components

1. Roof Renovation: Remove the original wooden roof and pour a new concrete roof to ensure waterproof performance and structural durability, while providing a foundation for the subsequent laying of roofing materials (such as tiles or metal sheets).
2. Exterior Wall Treatment: Remove the original exterior wall tiles, perform plastering and steel bar implantation and grouting to enhance the load-bearing strength and tensile properties of the walls, preventing wall cracking due to renovation.
3. Wall Removal and Beam Replacement: For prefabricated floor slab houses with cavity walls, temporary supports should be installed on both sides of the wall before chiseling out the opening for the main beam and then supporting the formwork to ensure the safe conversion of the load-bearing structure.

III. Construction Specifications and Monitoring

1. Demolition Principles: Follow a segmented demolition sequence of 'middle first, then sides', maintaining symmetrical demolition, with a daily demolition volume not exceeding 30% of the total floor slab area.
2. Stress Monitoring: Monitor the stress changes in the support system in real-time during demolition, and prohibit the use of heavy hammers for impact demolition to avoid impacting the foundation structure.

IV. Functional Upgrades and Renovation

1. Sound Insulation Treatment: Install sound insulation boards between the walls and floor slabs, and replace windows with double-glazed ones to effectively reduce noise interference.
2. Space and Circuit Optimization: Adjust the spatial layout according to modern living needs (such as adding a bathroom or expanding the kitchen), and simultaneously update the water and electricity circuits to ensure safety and convenience of use.

The renovation should strictly adhere to standards such as the 'General Code for Maintenance and Renovation of Existing Buildings'. It is recommended to commission a qualified construction unit to ensure that the renovated house meets safety and functional requirements.