Lianyungang House Renovation: Prefabricated Panels

The application of prefabricated panels in house renovation in Lianyungang should be comprehensively considered in combination with policy requirements, product types, and renovation scenarios, as detailed below:

I. Mandatory Policy Requirements and Scope of Application According to Document LJKH [2018] No. 78, Lianyungang has set clear requirements for the application of the 'three types of panels' (prefabricated internal and external wall panels, stair panels, and floor panels) in newly constructed buildings:

1. Scope of Implementation: This covers specific types of buildings in the central urban areas of the city and county towns, including hospitals, hotels, and office buildings with a single building area of ≥20,000 square meters; schools with an area of ≥5,000 square meters; newly constructed commercial residential buildings, apartments, and affordable housing; and standard factory buildings with an area of ≥10,000 square meters.
2. Application Ratio: The mandatory portion of the 'three types of panels' application ratio in the aforementioned buildings must not be less than 60%, with prefabricated floor panels (including prefabricated panels) being a core component.
3. Exceptions: The policy primarily targets newly constructed buildings. Renovation of existing buildings should refer to other regulations, but if expansion or structural upgrades are involved, similar standards may need to be followed.

II. Types and Supply of Prefabricated Panels The local prefabricated panel market in Lianyungang can meet diverse needs:

1. Structural Prefabricated Panels: Used for load-bearing parts such as floor panels and stair panels, these must comply with the structural safety standards for prefabricated buildings. They are produced by nine local prefabricated component enterprises, which collaborate with leading companies to ensure quality.
2. Non-Load-Bearing Wall Prefabricated Panels: Such as perforated partition strips, cement lightweight partition panels, and GRC prefabricated panels, these are suitable for partition renovations. For example, Gangde Building Materials offers customizable perforated lightweight partition panels with a starting price of 33 yuan per square meter, featuring fire resistance, sound insulation, and lightweight properties.
3. Customized Services: Some enterprises support customization of prefabricated panels according to size and performance requirements to adapt to different renovation scenarios.

III. Renovation Scenarios and Precautions

1. Renovation of Newly Constructed Buildings: If the house is newly constructed or expanded, priority should be given to adopting the 'three types of panels' system. Prefabricated floor panels can shorten the construction period and improve construction accuracy, but it is essential to clarify load requirements and connection node treatments during the design phase.
2. Renovation of Existing Buildings:
   • Non-Load-Bearing Wall Renovation: Lightweight prefabricated panels can be selected to replace traditional brick walls, reducing structural loads and enhancing spatial flexibility.
   • Load-Bearing Structure Renovation: A professional institution should assess the safety of the original structure. If prefabricated panel replacement is involved, reliable connections between the new panels and beams and columns must be ensured to avoid compromising overall stability.
3. Renovation of Portable Panel Houses: For temporary needs, prefabricated panel buildings can be renovated into steel-structured portable panel houses using environmentally friendly sandwich panels as walls. These offer advantages such as rapid assembly and disassembly and mobility but must comply with fire prevention and wind resistance standards for temporary buildings.

IV. Enterprise Support and Resources Nine prefabricated component enterprises in Lianyungang form a complete industrial chain, providing one-stop services from design, production, to installation. Before renovation, it is advisable to contact local enterprises (such as Gangde Building Materials) to obtain product parameters and construction plans to ensure compliance with policies and safety requirements.