1. Is galvanized color-coated steel coil suitable for building exterior walls?
Absolutely, and it is the mainstream choice for modern building wall systems.
Unlike roofs, walls primarily face the challenges of rain, sun exposure, and dust pollution. Galvanized color-coated steel coil, with its lightweight, high strength, corrosion resistance, and ease of processing, effectively addresses these challenges. It can be used as the exterior cladding for industrial plants, and its rich colors and textures make it a common material for the facade decoration of modern commercial buildings.
2. What are its advantages compared to other wall materials?
Compared to traditional brick walls or ordinary steel plates, its core advantages are prominent:
**Economical and Efficient:** Lightweight and high-strength, it greatly simplifies the wall support structure and reduces foundation costs. Prefabricated installation allows for fast construction and effectively shortens the construction period.
**Corrosion-Resistant and Durable:** The galvanized layer of the substrate provides cathodic protection, while the surface coating acts as a physical barrier. Under normal conditions, its service life can reach 15-25 years.
**Aesthetically Pleasing and Decorative:** A wide variety of colors and surface textures are available to meet the personalized aesthetic needs of different buildings.
**Easy to Maintain:** The smooth surface does not easily accumulate dust and has good stain resistance. Daily rinsing with water is sufficient to keep it clean, resulting in low maintenance costs.
3. What are the key points for wall surface construction and installation?
To ensure the waterproofing, corrosion resistance, and stability of the wall surface, the following points need special attention during construction:
Key Points Specific Instructions and Requirements
* **Board Fixing:** Screws should be driven into the corrugations at intervals ≤400mm, 15-20mm from the edge of the board, and must be driven in vertically. EPDM waterproof washers must be used with the screws.
* **Overlap Waterproofing:** The longitudinal overlap length of wall panels should be ≥100mm. The overlap must be sealed with neutral silicone weather-resistant sealant or butyl tape.
* **Cutting and Hole Opening:** Electric shears or cold saws should be used for cutting. High-temperature cutting is strictly prohibited to prevent damage to the coating.
* **Joint Treatment:** Matching edge trims and flashing should be installed at door and window openings, wall corners, and eaves. Gaps should be filled with sealant to form a complete waterproofing system.
4. What are the risks and precautions when selecting materials?
Improper material selection is a major cause of premature wall failure. The following three points require special attention:
**Baseboard Selection Based on Environment:** In coastal areas or areas with severe industrial pollution, it is recommended to prioritize aluminized zinc or zinc-aluminum-magnesium substrates, as their corrosion resistance lifespan is 3-5 times that of ordinary galvanized sheets.
**Coating Selection Based on Lifespan:** For projects requiring long-term durability (e.g., over 15 years), PVDF fluorocarbon coatings should be selected; for general environments, polyester (PE) coatings are a good choice due to their cost-effectiveness.
**Zipper Layer Weight Control:** If galvanized sheets are used, the weight of the double-sided zinc coating should not be lower than Z275 grade (i.e., 275g/m²) to ensure basic corrosion resistance.
5. How to maintain the wall surface for longer durability during daily use?
Daily maintenance of the wall surface after construction is simple yet crucial, mainly involving "regular inspections" and "timely repairs."
Regular Cleaning: It is recommended to clean the wall surface 1-2 times a year with clean water or a neutral detergent and a soft cloth to remove accumulated dust and contaminants.
Quarterly Inspection: A simple visual inspection can be conducted every quarter, focusing on whether screw washers are aged or cracked, whether sealant has failed, and whether the coating has scratches or rust spots.
Timely Repair: Minor problems should be addressed immediately. After cleaning and drying, repair or replace washers with the same type of sealant; rust spots need to be sanded and then sprayed with anti-corrosion paint compatible with the original coating.
Avoid Heavy Pressure and Contact: Do not place heavy objects on the wall surface or subject it to violent impacts. Direct contact between the color-coated steel sheet and cement mortar is strictly prohibited, as the alkaline substances in cement will corrode the coating; an isolation layer must be installed.