What is a Prefabricated Panel House

A prefabricated panel house is a type of dwelling constructed primarily using prefabricated panels, which are cement components manufactured in factories through specific processes and installed on-site. These houses were widely used in residential construction during the mid to late 20th century but have gradually been phased out due to structural deficiencies.

Production and Types of Prefabricated Panels

Prefabricated panels are cement components produced in factories through standardized processes. During production, wooden models are first nailed together to serve as molds. Inside these molds, steel reinforcement skeletons are laid to enhance structural strength. Cement is then poured and vibrated to achieve a dense consistency, ultimately forming either solid or hollow types. The hollow structure achieves lightweighting by reducing the amount of concrete used in non-load-bearing parts, saving materials and lowering transportation costs. This industrial production method ensures uniform component dimensions and controlled quality.

Construction Methods and Historical Applications

After production in factories, prefabricated panels are directly transported to construction sites for installation. During construction, cranes are used to lift the panels one by one into predetermined positions, where they are joined together through splicing or overlapping to form floor slabs, walls, and other structures. Compared to traditional cast-in-place concrete construction, the construction speed of prefabricated panel houses is significantly faster, with construction periods reduced by 30%-50%. From the 1960s to the 1990s, prefabricated panel houses became the primary form of housing for unit-funded construction and employee welfare housing allocations due to their low cost and fast construction speed, especially in multi-story residential buildings.

Structural Deficiencies and Reasons for Phase-Out

Prefabricated panel houses have two core issues: poor seismic performance and insufficient durability. Due to the mostly spliced connections between panels, the overall integrity is weak, making them prone to displacement or even collapse under seismic action. After long-term use, cracks can easily form at the spliced joints due to factors such as temperature changes and foundation settlement, leading to water leakage, steel reinforcement corrosion, and other issues that affect housing safety. With advancements in building technology, new systems such as frame structures and reinforced concrete structures have become mainstream due to their stronger seismic capabilities and durability, causing prefabricated panel houses to gradually withdraw from the new construction market and be used only in small quantities in temporary buildings or renovation projects.

Current Status and Alternative Solutions

Currently, prefabricated panel houses have been largely replaced by modern building systems. New residential buildings generally adopt frame structures or shear wall structures, achieving overall connectivity through cast-in-place concrete or prefabricated components (such as prefabricated wall panels and composite floor slabs), significantly improving seismic performance and structural lifespan. Some existing prefabricated panel houses have their service lives extended through reinforcement and renovation (such as adding structural columns or carbon fiber cloth reinforcement), but complete phase-out remains the industry trend.