Lifting Precast Slabs for Rural Houses

Lifting precast slabs for rural houses is characterized by low cost and fast construction, but it has deficiencies in waterproofing, thermal insulation, structural integrity, and earthquake resistance. Caution is required when drilling holes in the ceiling, and if the budget allows, it is recommended to opt for cast-in-place roofing.

I. Characteristics of Lifting Precast Slabs The price of lifting precast slabs for rural houses is calculated per meter, with different prices for slabs under 4 meters and over 4 meters. The construction speed is fast, typically taking only a day or half a day to complete the lifting. Before lifting, the film on the ground ring beam needs to be removed, and the position should be measured with a level and leveled with cement to prepare for laying.

II. Disadvantages of Lifting Precast Slabs

1. Waterproofing Issues: The probability of rain leakage is high, with 8 out of 10 houses potentially experiencing leaks. Even with waterproofing measures, complete avoidance is impossible, and the rainy season is a critical period for testing leaks.
2. Poor Thermal Insulation: The precast slab is about 12 centimeters thick and, although it has a hollow structure, its thermal insulation effect is poor. The indoor temperature is high in summer and low in winter, requiring secondary coverage with roofing materials for improvement.
3. Poor Structural Integrity: The precast slab has a hollow structure with the middle part not bearing weight. Cracks and water seepage are prone to occur at the joints, and the sound insulation effect is poor. It is difficult to use in areas requiring waterproofing or sound insulation, such as kitchens and bathrooms, and holes cannot be opened.
4. Low Earthquake Resistance: The earthquake resistance coefficient is low, making it unsuitable for earthquake-prone areas, as it is prone to collapse.

III. Precautions for Drilling Holes in the Ceiling of Precast Slabs If drilling holes in the ceiling of precast slabs is necessary, the following operational methods and safety precautions should be noted:

1. Position Selection: Avoid the steel bars in the precast slab and choose areas with less stress for drilling.
2. Depth Control: The drilling depth should not exceed one-third of the thickness of the precast slab to avoid damaging the structure.
3. Tool Selection: Use professional tools such as electric drills, controlling the speed and force appropriately.
4. Safety Protection: Wear protective equipment such as goggles and masks to prevent injury from debris.
5. Inspection and Maintenance: After drilling, check the precast slab for cracks or damage and regularly maintain the ceiling system.

IV. Alternative Solution Recommendations If the budget allows, it is recommended to use cast-in-place cement roofing, which is superior to precast slabs in terms of load-bearing capacity, earthquake resistance, sound insulation, and waterproofing performance, making it safer and more reliable for long-term use.