What is a Prefabricated Slab in House Decoration

In house decoration, a prefabricated slab is a pre-made building component primarily used for floor structures, but it can also be applied in scenarios such as roof insulation layers and gutter covers. It features convenient construction and low cost, yet it has weaknesses like poor earthquake resistance and weak integrity.

Production Process and Types

Prefabricated slabs are produced either in factories or on-site. A hollow mold is made using wooden planks, and steel bars are arranged inside. Then, cement is poured in. After it solidifies, the mold is removed to form a concrete component. Based on structural differences, there are two types:

• Solid Prefabricated Slab: It has a solid concrete structure throughout. It has strong load-bearing capacity but is relatively heavy, suitable for scenarios with high load-bearing requirements.
• Hollow Prefabricated Slab: It has hollow holes designed inside. By reducing the non-load-bearing concrete, it achieves lightweighting. While ensuring basic load-bearing capacity, it reduces its own weight, facilitating transportation and installation.

Core Features and Advantages

1. Convenient Construction: Prefabricated slabs can be directly transported to the construction site for installation, eliminating the need for on-site concrete pouring. This significantly shortens the construction period, especially suitable for projects with tight schedules.
2. Low Cost: Factory production allows for large-scale control of material and labor costs. Moreover, the hollow structure further saves on cement usage, making the overall cost lower than that of cast-in-place slabs.
3. Diverse Application Scenarios: In addition to floor slabs, they can also be used in non-load-bearing or lightly loaded scenarios such as roof insulation layers (reducing heat conduction through the hollow structure) and gutter covers (utilizing the durability of concrete).

Defects and Limitations

1. Weak Earthquake Resistance: Prefabricated slabs are installed in blocks, and the joint connection strength is lower than that of cast-in-place slabs. Under earthquake action, they are prone to dislocation or fracture.
2. Poor Integrity: There are joints between each slab. After long-term use, cracks may occur due to settlement differences, affecting structural stability.
3. Joint Leakage: If the joints are not properly waterproofed, rainwater can easily seep into the interior, requiring additional sealing treatment.
4. Limited Service Life: Usually, it is 30 - 50 years, which is shorter than the durability of cast-in-place slabs. Additionally, the maintenance cost after aging is relatively high.

Modern Application Trends

With the development of building technology, cast-in-place slabs have gradually become the mainstream due to their strong integrity and good earthquake resistance. However, prefabricated slabs still have value in old house renovations:

• Repair and Reinforcement: When partially replacing or reinforcing the floor slabs of old buildings, prefabricated slabs can quickly restore the structural function.
• Low-Cost Renovation: In scenarios with a limited budget and low earthquake resistance requirements, prefabricated slabs remain a cost-effective choice.