The Lifespan of Precast Panel Houses Has Expired

The expiration of the lifespan of precast panel houses does not necessarily mean they must be demolished. Whether they can continue to be inhabited depends on a comprehensive assessment of structural integrity and safety appraisal results. Under normal circumstances, the designed service life is 50 years, and they can continue to be inhabited if they meet the conditions.

I. Designed Lifespan and Scrapping Criteria

According to the "Unified Standard for Reliability Design of Building Structures" (GB50068-2018), the designed service life of ordinary buildings and structures is 50 years, and this regulation also applies to precast panel houses. The state does not mandate the direct scrapping of precast panel houses at 30 or 50 years. Their actual lifespan depends on maintenance conditions and structural safety. The statement of a designed lifespan of 30-50 years is more of a theoretical durability reference rather than an absolute scrapping deadline.

II. Core Conditions for Continued Habitation

Whether a house can continue to be inhabited depends on meeting two strict criteria:

1. Structural Integrity: It is necessary to check whether the house has large cracks, foundation subsidence, precast panel fractures, or severe wall deformations. If the main structure has no obvious damage and the load-bearing components (such as beams, columns, and floor slabs) have no defects affecting safety, then it has the basic conditions for continued use.
2. Qualified Safety Appraisal: It must pass a safety appraisal by the housing and urban-rural development department or a professional institution, especially meeting seismic fortification requirements. Old precast panel houses may not meet current seismic codes due to outdated design standards and need to be reinforced to improve safety.

III. Three Situations Where Habitation is Absolutely Prohibited

The following situations require immediate cessation of use and the implementation of measures:

1. Severe Damage to the Main Structure: Such as precast panel fractures, large-area cracks in load-bearing walls, foundation settlement causing house tilting, etc., which may pose a risk of collapse.
2. Overdue and Lacking Maintenance: The house has exceeded its 50-year designed service life and has been lacking in maintenance for a long time (such as unrepaired roof leaks and severe wall weathering), leading to continuous deterioration of structural performance.
3. Houses in High-Disaster-Risk Areas Without Reinforcement: Houses located in earthquake zones, flood-prone areas, or regions with frequent geological disasters that have not been reinforced for earthquake or flood resistance in accordance with regulations.

IV. Subsequent Requirements for Continued Habitation

If the house passes the appraisal and is structurally safe, regular maintenance is required:

1. Professional Reinforcement: If the seismic performance does not meet the standards, it is necessary to entrust a professional team to enhance seismic capacity by adding steel frames, installing shear walls, etc.
2. Annual Inspections: Focus on monitoring crack expansion, water leakage, and the connection parts of precast panels, especially paying attention to the junctions between floor slabs and walls in multi-story old buildings.
3. Compliant Renovations: Any structural modifications (such as wall removal or additional floors) must be approved in advance to avoid damaging structural stability due to non-compliant construction.