Prefabricated Slab Self-Built House Roof Construction
The roof construction of self-built houses using prefabricated slabs requires a comprehensive consideration of advantages, key points, and limitations, strictly adhering to standard operations.
Construction Advantages
Prefabricated slabs are manufactured in factories in advance and can be installed relatively quickly once transported to the site, significantly shortening the overall construction period of the house. This makes them a good choice for builders who prioritize efficiency. Their industrial production model ensures relatively stable prices, making them a more economical option for rural builders with limited budgets. Moreover, the relatively standardized processes and quality control systems in factory production can guarantee quality standards to a certain extent.
Construction Process and Key Points
During installation, controlling flatness is crucial, as it affects the stability and functionality of the subsequent roof. At the joints, especially the slab seams, proper waterproofing must be carried out; otherwise, leakage problems may easily occur later, affecting the usability of the house. Since it involves working at heights, strict safety protection measures must be implemented during both installation and subsequent maintenance, in compliance with construction safety regulations. The standard practice is to use structural columns in combination with ring beams to form a checkerboard pattern. The structural columns control the horizontal deformation of the walls, while the ring beams control the vertical deformation, thereby constraining the walls to demonstrate the earthquake resistance of the brick-concrete structure. If the house lacks ring beams, the prefabricated slabs placed on the walls may collapse during an earthquake.
Limitations
The connections between prefabricated slabs are relatively weak, resulting in average earthquake resistance. In the event of an earthquake, the overall earthquake resistance of the house is inferior to that of a cast-in-place roof. Their waterproofing performance may be inadequate, and leakage problems are prone to occur at the slab seams after installation. Additionally, the relatively fixed sizes of prefabricated slabs result in poor flexibility in spatial layout. When meeting the special layout requirements of the interior space of the house, they may not be as easily adjustable as cast-in-place roofs. For example, in the construction of the first-floor slab of a two-and-a-half-story self-built house using prefabricated five-hole slabs, problems such as gaps and light leakage were evident after assembly, and the lack of inter-floor ring beams posed safety hazards. Another example is a house where five-hole prefabricated slabs were placed on a pitched roof. Although horizontal members were installed at the ends to prevent sliding, it still reflects the need for careful handling of various situations during prefabricated slab construction.
