How to Make a Prefabricated Flat House Roof
The method for constructing a prefabricated flat house roof involves first prefabricating the roof panels and then assembling them on the brick walls of the roof, connecting the joints with concrete or cement mortar.
I. Prefabricated Panel Production Prefabricated panels are produced in advance at a factory or a designated area on the construction site. The materials used mainly include crushed stone, cement, sand, and coiled rods (or cold-drawn wires). During production, the coiled rods are first placed according to design requirements. The coiled rods enhance the strength and toughness of the prefabricated panels, improving their load-bearing capacity. Next, crushed stone, cement, and sand are mixed in a specific ratio. The mixed material is then poured into pre-prepared molds. Through processes such as vibration, the mixed material is compacted within the mold to form a prefabricated panel prototype that meets the design dimensions and shape. After a certain period of curing, allowing the cement to fully hydrate and harden, the prefabricated panels reach sufficient strength and can be removed from the molds for use.
II. Roof Installation Once the prefabricated panels are ready, roof installation can proceed. The prefabricated panels are placed directly on the pre-built brick walls of the roof. During placement, it is essential to ensure that the panels are stable, level, and accurately positioned. The panels are assembled one by one, with attention paid to aligning and tightly fitting adjacent panels during the process. After assembly, concrete or cement mortar is used to fill and connect the joints between the panels, forming a relatively unified structure that enhances the overall integrity and stability of the roof.
III. Disadvantages However, prefabricated panel roofs also have some disadvantages. Since they are not integrated with the walls, they cannot provide effective tensile or stabilizing forces during geological disasters such as earthquakes, posing risks of roof collapse. Additionally, joints between panels may develop gaps due to construction techniques or material shrinkage, leading to water leakage issues. Furthermore, when the foundation settles, cracks can form between the prefabricated panels and between the panels and the walls, affecting the roof's service life and safety.
