| 1 Match the metal to the environment | Will the sheets be exposed to coastal salt, industrial pollution, high humidity, or normal inland conditions? | Aluminum: naturally corrosion-resistant and lightweight. Galvanized steel: strong and economical, with zinc protection. Stainless steel: highly corrosion-resistant, but usually more costly. | Use metallic zinc protection for steel; choose aluminum or stainless steel where long-term corrosion exposure is a major concern. | Excellent for coastal: Aluminum / Stainless steel Good for inland: Galvanized steel | Commercial façades, marine-side buildings, industrial facilities, and residential exteriors. |
| 2 Compare strength and weight | Does the project require low structural weight, high impact resistance, or long panel spans? | Steel: generally offers higher stiffness and impact resistance. Aluminum: approximately one-third the density of steel, reducing panel weight. Stainless steel: strong and durable, but heavier than aluminum. | Use factory-finished sheet with a coating system suitable for forming and installation; verify the panel profile and thickness with the structural design. | Stronger sheets can better resist dents and wind pressure, while lighter sheets can reduce handling and supporting-frame loads. | High-traffic façades, soffits, roof edges, curtain-wall features, and lightweight renovation projects. |
| 3 Choose the right coating system | How much protection is needed against ultraviolet radiation, moisture, abrasion, and color fading? | Coating performance depends on the substrate, pretreatment, primer, and topcoat—not only on the metal itself. | PVDF: strong color and gloss retention for demanding exterior exposure. Silicone-modified polyester: good exterior performance for many general applications. Polyester: commonly used for standard exposure and budget-sensitive projects. | Excellent: High-UV or severe exposure Good: Typical exterior exposure Moderate: Lower-demand locations | Color-critical façades, institutional buildings, retail exteriors, warehouses, and residential cladding. |
| 4 Check weather and UV resistance | Will the cladding face strong sunlight, freeze-thaw cycles, heavy rain, snow, or high winds? | Metal sheets do not normally absorb water, but exposed cut edges, joints, fasteners, and damaged coatings can become vulnerable. | Specify a tested exterior coating, compatible sealants, corrosion-resistant fasteners, and correctly detailed flashing. | Review resistance to chalking, fading, corrosion, wind-driven rain, and temperature movement. Product performance should be supported by applicable test data. | High-rise façades, sunny elevations, cold climates, storm-exposed walls, and buildings with large panel areas. |
| 5 Evaluate maintenance and service life | How often can the façade be inspected and cleaned, and what maintenance access is available? | Aluminum and stainless steel: can provide long service with suitable detailing. Coated steel: requires protection of scratches, cut edges, and fastener areas. | Choose a durable finish with clear cleaning instructions. Avoid incompatible cleaners and prevent contact between dissimilar metals where galvanic corrosion may occur. | Regular washing can remove salt and pollutants. Prompt repair of scratches and damaged coating helps preserve corrosion protection. | Hard-to-access façades, transport buildings, coastal properties, and projects with low maintenance budgets. |
| 6 Verify fire and building-code requirements | Does the wall assembly need a specific fire classification, reaction-to-fire rating, or non-combustibility performance? | The metal sheet is only one part of the wall system. Core material, insulation, air barriers, joints, and cavity design can significantly affect fire performance. | Use a tested and approved complete assembly rather than relying solely on the sheet’s metal composition. | Confirm compliance with local regulations, tested system limits, cavity-barrier requirements, and installation details before purchase. | High-rise buildings, public facilities, schools, healthcare projects, and buildings subject to strict fire regulations. |
| 7 Inspect installation compatibility | Are the substrate, fasteners, joints, movement allowances, and drainage details compatible with the selected sheet? | Different metals can react when directly connected in the presence of moisture. Thermal expansion also varies by material and panel length. | Use compatible fasteners, isolating washers or membranes where required, approved sealants, and manufacturer-specified edge and joint treatments. | Correct laps, ventilation, drainage, flashing, and movement joints reduce water penetration, staining, buckling, and premature corrosion. | Rainscreen façades, insulated panels, standing-seam systems, ventilated cladding, and complex architectural envelopes. |