Renovation of Prefabricated Panel Houses Built in 1994

Renovation of prefabricated panel houses built in 1994 requires careful planning, with a focus on structural safety, addressing housing issues, and policy compliance. Specific considerations are as follows:

1. Structural safety as the core, avoiding damage to the load-bearing system
The design life of prefabricated panel houses is typically around 40 years. Houses built in 1994 are approaching or have exceeded their design life, and issues such as peeling wall surfaces and wall cracks are common. During renovation, it is essential to strictly avoid drilling holes in the gaps between prefabricated panels. If the top prefabricated panel has cracks in the middle, reinforcement measures must be taken when drilling holes: the gaps can be filled with wooden strips or 9mm boards first, then covered with gypsum boards, or double-layer gypsum boards can be used to enhance stability; alternatively, holes can be drilled directly, but aircraft expansion bolts should be used instead of ordinary expansion bolts to distribute the force. It is particularly crucial that the load-bearing walls of prefabricated panel houses cannot be removed or altered, as this may lead to overall structural instability and endanger living safety.

2. Addressing the inherent defects of the house in a targeted manner
Prefabricated panel houses have three common problems: poor thermal insulation and sound insulation, weak waterproofing, and insufficient seismic performance. Poor thermal insulation and sound insulation stem from the gaps between panels. During renovation, materials such as expanding foam or rock wool can be used to fill the gaps and seal them, and an outer layer of thermal insulation boards or sound insulation felt can be added. Weak waterproofing is caused by gaps in the prefabricated panels and cracks due to foundation settlement. It is necessary to first repair the cracks (e.g., with high-pressure grouting) and then apply waterproof coatings or lay waterproof membranes. Insufficient seismic performance requires reinforcement measures such as adding structural columns and ring beams to enhance overall stiffness, but these must be implemented after evaluation by a professional institution.

3. Policy compliance as a prerequisite, avoiding illegal renovation
According to regulations in 2023, the construction of prefabricated panel houses and other buildings that do not comply with safety standards is prohibited from being newly built, renovated, or expanded within urban construction land areas. Existing houses will be gradually included in demolition or renovation plans. Starting from 2025, various regions will successively introduce policies for the demolition and reconstruction of prefabricated panel houses. Before renovation, it is necessary to confirm with the local housing and construction department whether the house is included in the demolition scope. If not included, the renovation plan must pass a structural safety assessment and obtain approval; if included, it is necessary to cooperate with the government's unified arrangements to avoid wasting resources through self-initiated renovation.

Before renovation, it is recommended to entrust a professional institution to conduct a housing safety inspection and formulate a scientific plan to ensure that the renovation meets both safety standards and policy requirements.