Is Custom Prefabricated House on the Second Floor a Good Choice?

Whether custom prefabricated houses on the second floor are suitable depends on specific needs. If planned reasonably and constructed in accordance with standards, they can meet the requirements of certain scenarios, but they also have certain limitations.

I. Core Advantages of Prefabricated Houses Prefabricated houses have characteristics such as short construction periods, controllable costs, and mobility. Their components are produced in factories in a standardized manner, and on-site assembly is highly efficient, making them suitable for projects with tight deadlines. The material costs and labor expenses are relatively lower than those of traditional buildings, and some structures can be disassembled and reused, offering high flexibility. If a steel-structured modular prefabricated house is chosen, its load-bearing, waterproof, and thermal insulation performance are close to those of traditional houses, with a lifespan of over 50 years, making it suitable for long-term living needs.

II. Limitations of Second-Floor Prefabricated Houses and Solutions

1. Structural Safety: The load-bearing capacity of prefabricated slabs is limited, and the solution should be selected based on the room span. For ordinary bedrooms with a span of less than 3.6 meters, prefabricated slabs can be勉强 used, but cast-in-place slabs are more stable. For living rooms and master bedrooms with spans ranging from 3.6 meters to 4.8 meters, it is recommended to use cast-in-place slabs or thickened prefabricated slabs with structural reinforcement. For large-span living rooms over 4.8 meters, cast-in-place slabs must be used. If prefabricated slabs are forced to be used beyond the span limit, it may lead to floor deformation or cracking.
2. Seismic Performance: In areas with a seismic fortification intensity of 7 degrees or higher, it is recommended to directly choose cast-in-place slabs. In areas with a seismic fortification intensity of 6 degrees, for small-span two-story buildings, reliable prefabricated slabs can be used, but reinforced concrete ring beams must be set to enhance overall integrity. If seismic design is ignored, the connections between prefabricated components are prone to breakage during earthquakes, threatening居住 safety (living safety).
3. Sound and Thermal Insulation: The walls of prefabricated houses are thin, resulting in poor sound and thermal insulation performance. In cold regions, separate thermal insulation treatment is required, such as adding rock wool boards or polystyrene boards. In humid southern regions, the design of the moisture-proof layer should be strengthened to prevent wall condensation.

III. Construction Details and Material Selection It is necessary to choose products from regular manufacturers that comply with national standards to avoid problems such as water leakage and structural deformation caused by low-priced and inferior products. Require merchants to provide pollutant test reports for core materials and give priority to using environmentally friendly materials with E0 or higher standards. For prefabricated houses used outdoors, confirm that their wind and seismic resistance ratings meet the local climate and geological requirements. If the budget is limited and the requirements for living quality are not high, a combined solution of "cast-in-place in the core area and prefabricated in the secondary area" can be considered, that is, using cast-in-place strips below load-bearing walls and prefabricated slabs in the middle area of the floor. However, it should be noted that the grout joints used for connecting prefabricated houses have high technical requirements for the construction team, and rural self-built projects should proceed with caution.