1. What are the main advantages of prefabricated houses constructed from galvanized color-coated steel coils?
Prefabricated houses are the most common choice on construction sites mainly due to the following advantages:
💰 Economical: Compared to brick-and-mortar structures, prefabricated houses have much lower material costs and generate less construction waste. The materials can also be recycled, further reducing costs.
⚡ Quick Assembly: All components are standardized, allowing for quick installation and effectively shortening the construction period.
🔄 Flexible Relocation: Using bolted connections, they can be easily disassembled and reassembled, making them suitable for use on multiple construction sites.
🛡️ Weather and Corrosion Resistance: The surface coating provides excellent protection for the steel plate, ensuring its stability in outdoor environments.
2. What are the limitations and risks of using this type of prefabricated house?
Understanding its limitations will help you better determine if it suits your needs.
🎚️ Comfort Limitations: Its biggest drawbacks are its poor thermal insulation and soundproofing. It will be hotter in summer and colder in winter, and noise will be more noticeable when it rains.
🦾 Strength and Durability: Its lifespan is typically around 5-10 years, far shorter than permanent buildings. Its wind and snow pressure resistance is also relatively weak, making it unsuitable for permanent housing.
🔩 Maintenance and Corrosion: When the surface coating is scratched or ages over time, the internal steel plates may rust, requiring timely repair.
3. How to Choose Suitable Materials for Prefabricated Houses, and What are the Key Considerations?
The core of material selection is finding the optimal balance between "cost" and "performance." For prefabricated houses, practicality and cost-effectiveness are paramount.
🔩 Substrate Type: Hot-dip galvanized steel (GI) is the most cost-effective choice. If the budget allows, aluminized zinc steel (GL) offers 2-6 times better corrosion resistance, making it a more worry-free upgrade option.
🎨 Coating Selection: Ordinary polyester (PE) coating is recommended as the first choice. Its lifespan (5-10 years) matches the designed service life of the prefabricated house, and it is the most affordable. For greater durability, SMP coating (10-15 years) or HDP coating (10-15 years) are better choices. As for PVDF fluorocarbon coating, although its lifespan can reach over 20 years, it is expensive and not cost-effective unless there are special requirements.
📏 Thickness and Zinc Coating: A thickness of 0.3mm-0.5mm is recommended. For zinc plating, a weight of Z120-Z180 (i.e., 120g/m²-180g/m²) or higher is recommended to ensure basic rust prevention.
4. What precautions should be taken when installing and using a prefabricated house?
Good materials and proper construction and maintenance are equally important.
✅ Installation and Usage Points:
Proper Installation: Fixing bolts must use special parts with waterproof washers. Roof panels must be installed stably, with overlaps between panels no less than 15mm and aligned in the same direction, and sealed with sealant for waterproofing.
⚠️ Safe Use: Open flame stoves are strictly prohibited indoors. Ensure a qualified fire extinguisher is available and check that lightning protection grounding is compliant. The area around the prefabricated house should have unobstructed drainage and no standing water.
🔍 Daily Maintenance:
Regular Inspection: Inspect once within two weeks of installation, and then a comprehensive inspection is recommended every six months. Pay special attention to coating damage, rust, loose bolts, and aging sealant.
Timely Repair: If small coating damage is found, immediately grind away the rust and apply anti-corrosion paint of the same color to prevent further corrosion.
Proper cleaning: Wipe with water or neutral detergent. Do not use strong acids or alkalis or sharp tools.
5. What are the approximate costs and lifespan of this type of prefabricated house?
💰 Cost Breakdown: Prices are mainly affected by the steel market, substrate type, coating quality, and thickness.
Material Costs: The price of ordinary polyester coating materials is approximately 5800–7200 RMB/ton.
Finished House: The price of a completed house is approximately 200-400 RMB/square meter, depending on specifications and configuration.
⏳ Lifespan: Under normal maintenance and with suitable materials, the lifespan is typically 5-10 years. Choosing a superior substrate and coating (such as aluminum-zinc plating + SMP coating) can extend the lifespan to 10-15 years.