1. Differences in material properties
| Aspect | Aluminum Alloy Roof | Iron Sheet Roof |
|---|---|---|
| Raw Materials | Aluminum-magnesium-manganese alloy (Mg ≥ 3.5%) | Galvanized iron sheet or color-coated steel plate |
| Production Process | Surface fluorocarbon spraying (PVDF coating ≥ 25μm) | Iron sheet + epoxy resin coating |
| Weight | 3–5 kg/m² (lightweight) | 8–12 kg/m² (requires reinforcement of supporting structure) |
2. Comparison of core performance
Corrosion resistance
Aluminum alloy: Salt spray test life ≥20 years, no obvious rust in coastal areas;
Iron sheet: Rust spots appear in 5-8 years, and regular painting and maintenance are required in humid environments.
Fireproof performance
Aluminum alloy: non-combustible material (melting point 660℃), fireproof grade A1;
Iron sheet: fireproof grade A but easy to deform at high temperature, and may be carbonized by local heating.
Insulation and sound insulation
Aluminum alloy: double-layer aluminum plate + polyurethane core layer, summer insulation temperature difference reaches 8-12℃, rain noise ≤45 decibels;
Iron sheet: single-layer without insulation structure, indoor and outdoor temperature difference is only 2-3℃, rain noise ≥70 decibels.
Wind pressure resistance
Aluminum alloy: lock edge technology + wind resistance clip, wind pressure resistance ≥1.5kPa (12-level typhoon);
Iron sheet: fixed with rivets, maximum wind pressure resistance 1.0kPa, edge curling is easy.
3. Suggestions for adaptation scenarios
Aluminum alloy roofs are preferred: coastal/high humidity areas, high-end residences, photovoltaic integrated roofs, and long-term noise reduction scenarios;
Optional iron sheet roofs: temporary buildings, low-budget projects, and short-term use in inland dry areas.
Summary: Aluminum alloy roofs are superior to iron sheet roofs in terms of durability, fire prevention, and sound insulation, but the initial cost is 40%-60% higher. For long-term operation scenarios, aluminum alloy is recommended as the first choice, while for short-term or low-cost projects, iron sheet roofs can be considered.
