What is a Prefabricated Floor Slab House?

A prefabricated floor slab house is a building constructed primarily using prefabricated floor slabs. The following provides an introduction from the perspectives of the characteristics of prefabricated slabs, construction methods, building safety assessments, and renovation and management:

Characteristics of Prefabricated Slabs

Prefabricated slabs are cement components manufactured in factories. During production, a wooden mold is first nailed together, followed by the placement of steel reinforcement and the pouring of cement. They come in two types: solid and hollow. The hollow structure achieves lightweighting by reducing the non-load-bearing concrete, which, while ensuring a certain level of strength, reduces the slab's own weight, facilitating transportation and installation.

Construction Methods

When constructing a prefabricated floor slab house, the prefabricated cement slabs are transported to the construction site and pieced together one by one using cranes. Compared to traditional construction methods, this approach is faster, significantly shortening the construction period and improving building efficiency.

Building Safety Assessments

Building safety assessments classify buildings into four grades: A, B, C, and D. Grade A indicates structural safety; Grade B means that individual components are at risk but do not affect the overall structural safety; Grade C represents a partially dilapidated building; and Grade D denotes a completely dilapidated building. The prefabricated slab is merely a construction method for the building, and the assessment report serves as the building's 'health check-up conclusion'. Some prefabricated slab buildings that are well-maintained may be assessed as Grade B, while others, due to unauthorized modifications to load-bearing structures, may be classified as Grade C, even if they were constructed using other methods.

Renovation and Management

Currently, the '15th Five-Year Plan for Urban Renewal' issued by the State Council explicitly aims to renovate more than 500,000 non-complete housing units, including C- and D-grade dilapidated housing and prefabricated slab buildings, in cities, and steadily advance the renovation and management of prefabricated slab buildings and seismic reinforcement in earthquake-prone areas. For prefabricated floor slab houses assessed as Grade A or B with no major issues in the main structure, the most practical solution is old residential community renovation. For those assessed as Grade C dilapidated buildings with repair potential, the path of repair and reinforcement is taken. As for expropriation and demolition, the deciding factor is not the length of time the building has been constructed but whether there are projects in the area, such as road construction, subway construction, or public facility construction requiring land, or whether the area is included in a clear demolition and reconstruction project, which may then lead to legal expropriation procedures.